2 pin BSC2 to stepper
Archiver
Posts: 46,084
Hi all:
If anyone has worked with these Airpax stepper motor linear actuators give
me a holler please.
They don't seem to have any significant actuation force. Is the low $9 buck
price a tip off? Guess I answered my own question, but any feed back on this
is welcome. So if you pay big bucks the thing is going to have 1 LBF or so?
Here's my code if anyone is interested:
'
'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO P/N
162587)
'3/31/00 TECHNO_MASAI-M.PLUNKETT
'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
'TWO WIRE CONTROL OF STEPPER,
'STEPPER WIRE DIAGRAM TO '2544B
'ORG PIN 8
'BLK PIN 6
'BRN PIN 3
'YEL PIN 1
'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT WON'T PRINT
OUT UNLESS YOU '"PRINT AS IMAGE".
DIRS = %0000000000000111
CTR VAR WORD
DELAY VAR WORD
STEPS VAR WORD
COIL1_2 CON 0
COIL3_4 CON 1
DELAY = 2
STEPS = 50
'Retract
FOR CTR = 1 TO STEPS
LOW COIL1_2
HIGH COIL3_4
PAUSE DELAY
LOW COIL1_2
LOW COIL3_4
PAUSE DELAY
HIGH COIL1_2
LOW COIL3_4
PAUSE DELAY
HIGH COIL1_2
HIGH COIL3_4
PAUSE DELAY
NEXT
'EXTEND
FOR CTR = 1 TO STEPS
HIGH COIL1_2
HIGH COIL3_4
PAUSE DELAY
HIGH COIL1_2
LOW COIL3_4
PAUSE DELAY
LOW COIL1_2
LOW COIL3_4
PAUSE DELAY
LOW COIL1_2
HIGH COIL3_4
PAUSE DELAY
NEXT
END
If anyone has worked with these Airpax stepper motor linear actuators give
me a holler please.
They don't seem to have any significant actuation force. Is the low $9 buck
price a tip off? Guess I answered my own question, but any feed back on this
is welcome. So if you pay big bucks the thing is going to have 1 LBF or so?
Here's my code if anyone is interested:
'
'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO P/N
162587)
'3/31/00 TECHNO_MASAI-M.PLUNKETT
'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
'TWO WIRE CONTROL OF STEPPER,
'STEPPER WIRE DIAGRAM TO '2544B
'ORG PIN 8
'BLK PIN 6
'BRN PIN 3
'YEL PIN 1
'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT WON'T PRINT
OUT UNLESS YOU '"PRINT AS IMAGE".
DIRS = %0000000000000111
CTR VAR WORD
DELAY VAR WORD
STEPS VAR WORD
COIL1_2 CON 0
COIL3_4 CON 1
DELAY = 2
STEPS = 50
'Retract
FOR CTR = 1 TO STEPS
LOW COIL1_2
HIGH COIL3_4
PAUSE DELAY
LOW COIL1_2
LOW COIL3_4
PAUSE DELAY
HIGH COIL1_2
LOW COIL3_4
PAUSE DELAY
HIGH COIL1_2
HIGH COIL3_4
PAUSE DELAY
NEXT
'EXTEND
FOR CTR = 1 TO STEPS
HIGH COIL1_2
HIGH COIL3_4
PAUSE DELAY
HIGH COIL1_2
LOW COIL3_4
PAUSE DELAY
LOW COIL1_2
LOW COIL3_4
PAUSE DELAY
LOW COIL1_2
HIGH COIL3_4
PAUSE DELAY
NEXT
END
Comments
your code. I have used a Slo-Syn stepper and a geared stepper from Airpax.
Mine will not even run with a delay of only 2 ms. In both cases, torque
falls off below ~25 ms. If you look with a scope, you can see that coil
current doesn't have time to decay, (because of inductance), at too high a
stepping rate. In addition, mechanical inertia also eats up torque at high
rates. The max rate depends on the particular stepper, but I will bet that
2 ms is way too fast for your motor. The rate can be boosted somewhat by a
zener in your clamp circuit.
Better late than never?
Ray McArthur
Original Message
From: techno_masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Saturday, April 01, 2000 10:26 PM
Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> Hi all:
>
> If anyone has worked with these Airpax stepper motor linear actuators give
> me a holler please.
> They don't seem to have any significant actuation force. Is the low $9
buck
> price a tip off? Guess I answered my own question, but any feed back on
this
> is welcome. So if you pay big bucks the thing is going to have 1 LBF or
so?
>
> Here's my code if anyone is interested:
> '
> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO P/N
> 162587)
> '3/31/00 TECHNO_MASAI-M.PLUNKETT
> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
> 'TWO WIRE CONTROL OF STEPPER,
> 'STEPPER WIRE DIAGRAM TO '2544B
> 'ORG PIN 8
> 'BLK PIN 6
> 'BRN PIN 3
> 'YEL PIN 1
> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT WON'T
PRINT
> OUT UNLESS YOU '"PRINT AS IMAGE".
>
> DIRS = %0000000000000111
>
> CTR VAR WORD
> DELAY VAR WORD
> STEPS VAR WORD
>
> COIL1_2 CON 0
> COIL3_4 CON 1
>
> DELAY = 2
> STEPS = 50
>
> 'Retract
>
> FOR CTR = 1 TO STEPS
>
> LOW COIL1_2
> HIGH COIL3_4
> PAUSE DELAY
>
> LOW COIL1_2
> LOW COIL3_4
> PAUSE DELAY
>
> HIGH COIL1_2
> LOW COIL3_4
> PAUSE DELAY
>
> HIGH COIL1_2
> HIGH COIL3_4
> PAUSE DELAY
>
> NEXT
>
> 'EXTEND
>
> FOR CTR = 1 TO STEPS
>
> HIGH COIL1_2
> HIGH COIL3_4
> PAUSE DELAY
>
> HIGH COIL1_2
> LOW COIL3_4
> PAUSE DELAY
>
> LOW COIL1_2
> LOW COIL3_4
> PAUSE DELAY
>
> LOW COIL1_2
> HIGH COIL3_4
> PAUSE DELAY
>
> NEXT
>
> END
>
>
>
>
>
> eGroups.com home: http://www.egroups.com/group/basicstamps
> http://www.egroups.com - Simplifying group communications
>
>
>
>
Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I don't know
how to interpret a scope reading on a stepper,(more the willing to read
anything you might comment on here) but with the delay set to 2 I get the
best performance i.e. seems to get most force, but it skips steps, at other
delays, say just like 4 or so, or even 30, 35 it skips a lotta steps and
auto reverses at the slightest actuation force, like if I touch the
actuator, it will back right up.
Anyway this thing runs great with the delay set to 2 but I need more
reliability, no skipped steps.
I will look into the Slo Syn stepper.
Also, I had a 15v zener on it, just like the Allegro spec sheet for the
UND2544B.
Thanks, no matter how late, I'm just glad I got your post, there been a
pretty big increase in the number of post recently, though they're all
pretty interesting.
Mark
Original Message
From: rjmca <rjmca@w...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Tuesday, April 11, 2000 6:34 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>Pardon the delayed response, but I just noticed that you have delay=2 in
>your code. I have used a Slo-Syn stepper and a geared stepper from Airpax.
>Mine will not even run with a delay of only 2 ms. In both cases, torque
>falls off below ~25 ms. If you look with a scope, you can see that coil
>current doesn't have time to decay, (because of inductance), at too high a
>stepping rate. In addition, mechanical inertia also eats up torque at high
>rates. The max rate depends on the particular stepper, but I will bet that
>2 ms is way too fast for your motor. The rate can be boosted somewhat by a
>zener in your clamp circuit.
>
>Better late than never?
>Ray McArthur
>
>
Original Message
>From: techno_masai <plunkettm@e...>
>To: <basicstamps@egroups.com>
>Sent: Saturday, April 01, 2000 10:26 PM
>Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
>> Hi all:
>>
>> If anyone has worked with these Airpax stepper motor linear actuators
give
>> me a holler please.
>> They don't seem to have any significant actuation force. Is the low $9
>buck
>> price a tip off? Guess I answered my own question, but any feed back on
>this
>> is welcome. So if you pay big bucks the thing is going to have 1 LBF or
>so?
>>
>> Here's my code if anyone is interested:
>> '
>> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO P/N
>> 162587)
>> '3/31/00 TECHNO_MASAI-M.PLUNKETT
>> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
>> 'TWO WIRE CONTROL OF STEPPER,
>> 'STEPPER WIRE DIAGRAM TO '2544B
>> 'ORG PIN 8
>> 'BLK PIN 6
>> 'BRN PIN 3
>> 'YEL PIN 1
>> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT WON'T
>PRINT
>> OUT UNLESS YOU '"PRINT AS IMAGE".
>>
>> DIRS = %0000000000000111
>>
>> CTR VAR WORD
>> DELAY VAR WORD
>> STEPS VAR WORD
>>
>> COIL1_2 CON 0
>> COIL3_4 CON 1
>>
>> DELAY = 2
>> STEPS = 50
>>
>> 'Retract
>>
>> FOR CTR = 1 TO STEPS
>>
>> LOW COIL1_2
>> HIGH COIL3_4
>> PAUSE DELAY
>>
>> LOW COIL1_2
>> LOW COIL3_4
>> PAUSE DELAY
>>
>> HIGH COIL1_2
>> LOW COIL3_4
>> PAUSE DELAY
>>
>> HIGH COIL1_2
>> HIGH COIL3_4
>> PAUSE DELAY
>>
>> NEXT
>>
>> 'EXTEND
>>
>> FOR CTR = 1 TO STEPS
>>
>> HIGH COIL1_2
>> HIGH COIL3_4
>> PAUSE DELAY
>>
>> HIGH COIL1_2
>> LOW COIL3_4
>> PAUSE DELAY
>>
>> LOW COIL1_2
>> LOW COIL3_4
>> PAUSE DELAY
>>
>> LOW COIL1_2
>> HIGH COIL3_4
>> PAUSE DELAY
>>
>> NEXT
>>
>> END
>>
>>
>>
>>
>>
>> eGroups.com home: http://www.egroups.com/group/basicstamps
>> http://www.egroups.com - Simplifying group communications
>>
>>
>>
>>
>
>
>
>
>
The behavior you describe is bizarre. Normally, skipped steps occur at
too-high rates. Could you have the coils connected wrong, or an incorrect
step? When my code had errors, the motor was quite erratic. I'll check
your code when we have a chance.
I just looked at the Jameco catalog... they don't give coil resistance.
Did you measure it? The steppers I messed with are rotary units, but yours
simply looks like a rotary stepper with a leadscrew attached, so I would
expect it to be similar in operation. The Airpax products I have seen were
decent quality.
Ray
Original Message
From: techno_masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Wednesday, April 12, 2000 11:08 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> Hi Ray:
>
> Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I don't
know
> how to interpret a scope reading on a stepper,(more the willing to read
> anything you might comment on here) but with the delay set to 2 I get the
> best performance i.e. seems to get most force, but it skips steps, at
other
> delays, say just like 4 or so, or even 30, 35 it skips a lotta steps and
> auto reverses at the slightest actuation force, like if I touch the
> actuator, it will back right up.
> Anyway this thing runs great with the delay set to 2 but I need more
> reliability, no skipped steps.
>
> I will look into the Slo Syn stepper.
>
> Also, I had a 15v zener on it, just like the Allegro spec sheet for the
> UND2544B.
>
> Thanks, no matter how late, I'm just glad I got your post, there been a
> pretty big increase in the number of post recently, though they're all
> pretty interesting.
>
> Mark
>
>
Original Message
> From: rjmca <rjmca@w...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Date: Tuesday, April 11, 2000 6:34 PM
> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
> >Pardon the delayed response, but I just noticed that you have delay=2 in
> >your code. I have used a Slo-Syn stepper and a geared stepper from
Airpax.
> >Mine will not even run with a delay of only 2 ms. In both cases, torque
> >falls off below ~25 ms. If you look with a scope, you can see that coil
> >current doesn't have time to decay, (because of inductance), at too high
a
> >stepping rate. In addition, mechanical inertia also eats up torque at
high
> >rates. The max rate depends on the particular stepper, but I will bet
that
> >2 ms is way too fast for your motor. The rate can be boosted somewhat by
a
> >zener in your clamp circuit.
> >
> >Better late than never?
> >Ray McArthur
> >
> >
Original Message
> >From: techno_masai <plunkettm@e...>
> >To: <basicstamps@egroups.com>
> >Sent: Saturday, April 01, 2000 10:26 PM
> >Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >
> >
> >> Hi all:
> >>
> >> If anyone has worked with these Airpax stepper motor linear actuators
> give
> >> me a holler please.
> >> They don't seem to have any significant actuation force. Is the low $9
> >buck
> >> price a tip off? Guess I answered my own question, but any feed back on
> >this
> >> is welcome. So if you pay big bucks the thing is going to have 1 LBF or
> >so?
> >>
> >> Here's my code if anyone is interested:
> >> '
> >> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO P/N
> >> 162587)
> >> '3/31/00 TECHNO_MASAI-M.PLUNKETT
> >> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
> >> 'TWO WIRE CONTROL OF STEPPER,
> >> 'STEPPER WIRE DIAGRAM TO '2544B
> >> 'ORG PIN 8
> >> 'BLK PIN 6
> >> 'BRN PIN 3
> >> 'YEL PIN 1
> >> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT WON'T
> >PRINT
> >> OUT UNLESS YOU '"PRINT AS IMAGE".
> >>
> >> DIRS = %0000000000000111
> >>
> >> CTR VAR WORD
> >> DELAY VAR WORD
> >> STEPS VAR WORD
> >>
> >> COIL1_2 CON 0
> >> COIL3_4 CON 1
> >>
> >> DELAY = 2
> >> STEPS = 50
> >>
> >> 'Retract
> >>
> >> FOR CTR = 1 TO STEPS
> >>
> >> LOW COIL1_2
> >> HIGH COIL3_4
> >> PAUSE DELAY
> >>
> >> LOW COIL1_2
> >> LOW COIL3_4
> >> PAUSE DELAY
> >>
> >> HIGH COIL1_2
> >> LOW COIL3_4
> >> PAUSE DELAY
> >>
> >> HIGH COIL1_2
> >> HIGH COIL3_4
> >> PAUSE DELAY
> >>
> >> NEXT
> >>
> >> 'EXTEND
> >>
> >> FOR CTR = 1 TO STEPS
> >>
> >> HIGH COIL1_2
> >> HIGH COIL3_4
> >> PAUSE DELAY
> >>
> >> HIGH COIL1_2
> >> LOW COIL3_4
> >> PAUSE DELAY
> >>
> >> LOW COIL1_2
> >> LOW COIL3_4
> >> PAUSE DELAY
> >>
> >> LOW COIL1_2
> >> HIGH COIL3_4
> >> PAUSE DELAY
> >>
> >> NEXT
> >>
> >> END
> >>
> >>
> >>
>
>>
> >>
> >> eGroups.com home: http://www.egroups.com/group/basicstamps
> >> http://www.egroups.com - Simplifying group communications
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
>
>
>
>
[noparse][[/noparse]Apologies to all for the length of this post, but I felt the
information important to many Stampers - due to the fairly
recent availability of linear actuators in the surplus catalogs,
here in the US]
Mark and Ray:
Sorry for my "delayed" response as well. Either my ISP or the eGroups mail
monster ate my earlier reply to this 'thread' <sigh>.
You might take a look at this reference Mark and confirm a recollection I
have -
[noparse][[/noparse] http://www.thomsonmotors.com/airpax/airpax.htm ] in the center picture
labelled
" Value Added Products - "
" Geared Motors and Digital "
" Linear Actuators "
and take a look at the linear actuator at the bottom of the picture -
center of
the frame. If that is what the Jameco (Airpax) linear actuator looks like,
you
may want to continue with that lead and this note. If so,
The Thomson Industries (Airpax) series numbers are:
K92100 and L92100 and are called "Digital Linear Actuators"
Although there is no document number on the literature I personally have
before me, the title/ref is:
"Product Selection and Engineering Guide", Thomson (Airpax Mechatronics),
Thomson Industries, 7 McKee Place, Port Washington, NY, 11050, USA;
1-203-271-6400; www.thomsonmotors.com
and
WWW: www.thomsonindustries.com (US HQ Corporate Site)
E-Mail: litrequest@t... US Toll-Free 1-800-554-8466
Literature Req. No. 12-01-000-6001 US Fax 1-800-445-0329
or 1-516-883-9039 Int'l
Other E-Mail: GB/Europe info@t... ASIA airpax@t...
It can be obtained by download from that same website noted above
[noparse][[/noparse] www.thomsonmotors.com/airpax ] in the Catalog Section, or apparently by
requesting Literature No. 12-01-000-6001 by e-mail (see refs above);
various torque curves are shown there as well.
Personally, I think this piece of literature is a (device specific) "must
have",
and I obtained mine by Snail Mail - some time ago. Whether it can be
ordered like
that today, I don't know for sure. An inquiry at the website might
determine that.
The reason I view it as a "must have" is from the pov that there is very
little
in the way of documentation on linear actuators (in general), and it has
been my experience that most of the units available (new, surplus,
liquidated, etc) seem
to be (at least similar) to those listed in this Thomson (Airpax) catalog.
There is a more important reason yet - if one looks closely at the
documentation (I can't speak for the download, although I would hope it
would concur), one comes to realization that these must be driven as
UNI-POLAR steppers would be driven. This
ties us back to the original question <whew !>.
The Allegro Chip mentioned is for BI-POLAR Steppers. At this juncture the
best recommendation I could make, would be to hold on to the Allegro chip
for some
future adventure with BI-POLAR steppers, and wander over the the E-Lab site:
[noparse][[/noparse] www.elab.com ] and take a look at their EDE-1200 Uni-Polar Stepper ASIC
Chip.
Why ?
In truth any UNI-POLAR stepper drive chip might do, from scads of
manufacturers.
It would be my guess that some additional torque insight might be required,
however, and the quickest route I know to FIRST-HAND information is via
E-Labs and the Prez. there, Todd Peterson [noparse][[/noparse]EMAIL: "Todd Peterson"
<toddp@e...> ] who is kind
enough to monitor this list.
Perhaps Elabs might take this on as a small documentation side-project
(hint, hint),
at some future date. There is additional information I would be happy to
offer for reference. An Elabs EDE-1200 App Note regarding (Airpax) Linear
Actuators, relative
to microprocessors in general, and the Stamp family in specific would be
MOST welcome by all, I'm sure (least *I* would love to have one <smile>).
The additional specific topic(s) of "torque" + "UN-POLAR" + "EDE-1200" (or
other
chips) might be a topic for a brief E.E. "White Paper" (as are becoming so
popular today on niche subjects <weird !>). YMMV on that one.
The tenative and general conclusions I have reached from what I've read, and
what I've learned thru experimetation - are:
FULL, HALF, and MICRO-STEPPING methods are available from UNI-POLAR drive
chips,
and torque curves will vary accordingly. More than that, gearing may be
required, depending on the application. Actuators aren't generally
appropriate for use in
stepper motor applications, but stepper motors (to an extent) might be used
like
a linear actuator (Acme/ball screw drive and helix shaft). Individual
applications
may vary from that general premise.
Generally SLO SYN (type and brand) motors are expensive (even surplus) but
sometimes they are quite necessary; again, depending on the application.
If the Airpax unit is the one I suspect it is - it is intended for LIGHT
DUTY application ONLY. Low cost, light loads and like factors are
consistant with these Airpax (surplus) units.
Hope that helps.
Regards,
Bruce
>Hi Ray:
>
>Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I don't know
>how to interpret a scope reading on a stepper,(more the willing to read
>anything you might comment on here) but with the delay set to 2 I get the
>best performance i.e. seems to get most force, but it skips steps, at other
>delays, say just like 4 or so, or even 30, 35 it skips a lotta steps and
>auto reverses at the slightest actuation force, like if I touch the
>actuator, it will back right up.
>Anyway this thing runs great with the delay set to 2 but I need more
>reliability, no skipped steps.
>
>I will look into the Slo Syn stepper.
>
>Also, I had a 15v zener on it, just like the Allegro spec sheet for the
>UND2544B.
>
>Thanks, no matter how late, I'm just glad I got your post, there been a
>pretty big increase in the number of post recently, though they're all
>pretty interesting.
>
>Mark
>
>
Original Message
>From: rjmca <rjmca@w...>
>To: basicstamps@egroups.com <basicstamps@egroups.com>
>Date: Tuesday, April 11, 2000 6:34 PM
>Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
>>Pardon the delayed response, but I just noticed that you have delay=2 in
>>your code. I have used a Slo-Syn stepper and a geared stepper from Airpax.
>>Mine will not even run with a delay of only 2 ms. In both cases, torque
>>falls off below ~25 ms. If you look with a scope, you can see that coil
>>current doesn't have time to decay, (because of inductance), at too high a
>>stepping rate. In addition, mechanical inertia also eats up torque at high
>>rates. The max rate depends on the particular stepper, but I will bet that
>>2 ms is way too fast for your motor. The rate can be boosted somewhat by a
>>zener in your clamp circuit.
>>
>>Better late than never?
>>Ray McArthur
>>
>>
Original Message
>>From: techno_masai <plunkettm@e...>
>>To: <basicstamps@egroups.com>
>>Sent: Saturday, April 01, 2000 10:26 PM
>>Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>>
>>
>>> Hi all:
>>>
>>> If anyone has worked with these Airpax stepper motor linear actuators
>give
>>> me a holler please.
>>> They don't seem to have any significant actuation force. Is the low $9
>>buck
>>> price a tip off? Guess I answered my own question, but any feed back on
>>this
>>> is welcome. So if you pay big bucks the thing is going to have 1 LBF or
>>so?
>>>
>>> Here's my code if anyone is interested:
>>> '
>>> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO P/N
>>> 162587)
>>> '3/31/00 TECHNO_MASAI-M.PLUNKETT
>>> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
>>> 'TWO WIRE CONTROL OF STEPPER,
>>> 'STEPPER WIRE DIAGRAM TO '2544B
>>> 'ORG PIN 8
>>> 'BLK PIN 6
>>> 'BRN PIN 3
>>> 'YEL PIN 1
>>> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT WON'T
>>PRINT
>>> OUT UNLESS YOU '"PRINT AS IMAGE".
>>>
>>> DIRS = %0000000000000111
>>>
>>> CTR VAR WORD
>>> DELAY VAR WORD
>>> STEPS VAR WORD
>>>
>>> COIL1_2 CON 0
>>> COIL3_4 CON 1
>>>
>>> DELAY = 2
>>> STEPS = 50
>>>
>>> 'Retract
>>>
>>> FOR CTR = 1 TO STEPS
>>>
>>> LOW COIL1_2
>>> HIGH COIL3_4
>>> PAUSE DELAY
>>>
>>> LOW COIL1_2
>>> LOW COIL3_4
>>> PAUSE DELAY
>>>
>>> HIGH COIL1_2
>>> LOW COIL3_4
>>> PAUSE DELAY
>>>
>>> HIGH COIL1_2
>>> HIGH COIL3_4
>>> PAUSE DELAY
>>>
>>> NEXT
>>>
>>> 'EXTEND
>>>
>>> FOR CTR = 1 TO STEPS
>>>
>>> HIGH COIL1_2
>>> HIGH COIL3_4
>>> PAUSE DELAY
>>>
>>> HIGH COIL1_2
>>> LOW COIL3_4
>>> PAUSE DELAY
>>>
>>> LOW COIL1_2
>>> LOW COIL3_4
>>> PAUSE DELAY
>>>
>>> LOW COIL1_2
>>> HIGH COIL3_4
>>> PAUSE DELAY
>>>
>>> NEXT
>>>
>>> END
>>>
>>>
>>>
>>>
>>>
>>> eGroups.com home: http://www.egroups.com/group/basicstamps
>>> http://www.egroups.com - Simplifying group communications
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
>
>
>
>
I just looked at your code and may have found a problem. Assuming your
motor color codes follow the Airpax codes shown on page 101 of the V1.9
manual, and the wires are connected as you say in your code comments, the
coil phases are incorrect. They should be:
red & green to positive
yellow to UDN pin 1
orange to pin 3
brown to pin 8
black to pin 6
The code looks OK, except you will get a "glitch" when backing up. You can
greatly abbreviate the code you are using by using LOOKUP as in the stamp
manual, page 43.
Good luck,
Ray McArthur
Original Message
From: rjmca <rjmca@w...>
To: <basicstamps@egroups.com>
Sent: Thursday, April 13, 2000 12:28 AM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> Mark:
>
> The behavior you describe is bizarre. Normally, skipped steps occur at
> too-high rates. Could you have the coils connected wrong, or an incorrect
> step? When my code had errors, the motor was quite erratic. I'll check
> your code when we have a chance.
>
> I just looked at the Jameco catalog... they don't give coil resistance.
> Did you measure it? The steppers I messed with are rotary units, but
yours
> simply looks like a rotary stepper with a leadscrew attached, so I would
> expect it to be similar in operation. The Airpax products I have seen
were
> decent quality.
>
> Ray
>
>
Original Message
> From: techno_masai <plunkettm@e...>
> To: <basicstamps@egroups.com>
> Sent: Wednesday, April 12, 2000 11:08 PM
> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
> > Hi Ray:
> >
> > Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I don't
> know
> > how to interpret a scope reading on a stepper,(more the willing to read
> > anything you might comment on here) but with the delay set to 2 I get
the
> > best performance i.e. seems to get most force, but it skips steps, at
> other
> > delays, say just like 4 or so, or even 30, 35 it skips a lotta steps and
> > auto reverses at the slightest actuation force, like if I touch the
> > actuator, it will back right up.
> > Anyway this thing runs great with the delay set to 2 but I need more
> > reliability, no skipped steps.
> >
> > I will look into the Slo Syn stepper.
> >
> > Also, I had a 15v zener on it, just like the Allegro spec sheet for the
> > UND2544B.
> >
> > Thanks, no matter how late, I'm just glad I got your post, there been a
> > pretty big increase in the number of post recently, though they're all
> > pretty interesting.
> >
> > Mark
> >
> >
Original Message
> > From: rjmca <rjmca@w...>
> > To: basicstamps@egroups.com <basicstamps@egroups.com>
> > Date: Tuesday, April 11, 2000 6:34 PM
> > Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >
> >
> > >Pardon the delayed response, but I just noticed that you have delay=2
in
> > >your code. I have used a Slo-Syn stepper and a geared stepper from
> Airpax.
> > >Mine will not even run with a delay of only 2 ms. In both cases,
torque
> > >falls off below ~25 ms. If you look with a scope, you can see that
coil
> > >current doesn't have time to decay, (because of inductance), at too
high
> a
> > >stepping rate. In addition, mechanical inertia also eats up torque at
> high
> > >rates. The max rate depends on the particular stepper, but I will bet
> that
> > >2 ms is way too fast for your motor. The rate can be boosted somewhat
by
> a
> > >zener in your clamp circuit.
> > >
> > >Better late than never?
> > >Ray McArthur
> > >
> > >
Original Message
> > >From: techno_masai <plunkettm@e...>
> > >To: <basicstamps@egroups.com>
> > >Sent: Saturday, April 01, 2000 10:26 PM
> > >Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> > >
> > >
> > >> Hi all:
> > >>
> > >> If anyone has worked with these Airpax stepper motor linear actuators
> > give
> > >> me a holler please.
> > >> They don't seem to have any significant actuation force. Is the low
$9
> > >buck
> > >> price a tip off? Guess I answered my own question, but any feed back
on
> > >this
> > >> is welcome. So if you pay big bucks the thing is going to have 1 LBF
or
> > >so?
> > >>
> > >> Here's my code if anyone is interested:
> > >> '
> > >> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO
P/N
> > >> 162587)
> > >> '3/31/00 TECHNO_MASAI-M.PLUNKETT
> > >> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
> > >> 'TWO WIRE CONTROL OF STEPPER,
> > >> 'STEPPER WIRE DIAGRAM TO '2544B
> > >> 'ORG PIN 8
> > >> 'BLK PIN 6
> > >> 'BRN PIN 3
> > >> 'YEL PIN 1
> > >> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT
WON'T
> > >PRINT
> > >> OUT UNLESS YOU '"PRINT AS IMAGE".
> > >>
> > >> DIRS = %0000000000000111
> > >>
> > >> CTR VAR WORD
> > >> DELAY VAR WORD
> > >> STEPS VAR WORD
> > >>
> > >> COIL1_2 CON 0
> > >> COIL3_4 CON 1
> > >>
> > >> DELAY = 2
> > >> STEPS = 50
> > >>
> > >> 'Retract
> > >>
> > >> FOR CTR = 1 TO STEPS
> > >>
> > >> LOW COIL1_2
> > >> HIGH COIL3_4
> > >> PAUSE DELAY
> > >>
> > >> LOW COIL1_2
> > >> LOW COIL3_4
> > >> PAUSE DELAY
> > >>
> > >> HIGH COIL1_2
> > >> LOW COIL3_4
> > >> PAUSE DELAY
> > >>
> > >> HIGH COIL1_2
> > >> HIGH COIL3_4
> > >> PAUSE DELAY
> > >>
> > >> NEXT
> > >>
> > >> 'EXTEND
> > >>
> > >> FOR CTR = 1 TO STEPS
> > >>
> > >> HIGH COIL1_2
> > >> HIGH COIL3_4
> > >> PAUSE DELAY
> > >>
> > >> HIGH COIL1_2
> > >> LOW COIL3_4
> > >> PAUSE DELAY
> > >>
> > >> LOW COIL1_2
> > >> LOW COIL3_4
> > >> PAUSE DELAY
> > >>
> > >> LOW COIL1_2
> > >> HIGH COIL3_4
> > >> PAUSE DELAY
> > >>
> > >> NEXT
> > >>
> > >> END
Thanks for looking over my code and hook up, seems like I went thru every
permutation on the wiring from the UDN to the AirPax, but will check what
you suggested.
On the Airpax from Jameco, both the positive wires are red, I connected them
together to 12v. I ran a zener 2EZ15D5MSCT from the same 12v with the zigzag
end pointing to the UDN and ran it to pins 2 and 7.
Am planning on using the look up table once I get the Airpax up and running
decently.
The resistance between the brn & org is 115 ohms, between the brn & red its
59 ohms, between the brn & the other red(no green wire on this Airpax unit)
is 0.
Per Al Williams book I though I had it figured out.
Mark
Original Message
From: rjmca <rjmca@w...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Thursday, April 13, 2000 2:23 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>Mark:
>
>I just looked at your code and may have found a problem. Assuming your
>motor color codes follow the Airpax codes shown on page 101 of the V1.9
>manual, and the wires are connected as you say in your code comments, the
>coil phases are incorrect. They should be:
>
>red & green to positive
>yellow to UDN pin 1
>orange to pin 3
>brown to pin 8
>black to pin 6
>
>The code looks OK, except you will get a "glitch" when backing up. You can
>greatly abbreviate the code you are using by using LOOKUP as in the stamp
>manual, page 43.
>
>Good luck,
>Ray McArthur
>
>
Original Message
>From: rjmca <rjmca@w...>
>To: <basicstamps@egroups.com>
>Sent: Thursday, April 13, 2000 12:28 AM
>Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
>> Mark:
>>
>> The behavior you describe is bizarre. Normally, skipped steps occur at
>> too-high rates. Could you have the coils connected wrong, or an
incorrect
>> step? When my code had errors, the motor was quite erratic. I'll check
>> your code when we have a chance.
>>
>> I just looked at the Jameco catalog... they don't give coil resistance.
>> Did you measure it? The steppers I messed with are rotary units, but
>yours
>> simply looks like a rotary stepper with a leadscrew attached, so I would
>> expect it to be similar in operation. The Airpax products I have seen
>were
>> decent quality.
>>
>> Ray
>>
>>
Original Message
>> From: techno_masai <plunkettm@e...>
>> To: <basicstamps@egroups.com>
>> Sent: Wednesday, April 12, 2000 11:08 PM
>> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>>
>>
>> > Hi Ray:
>> >
>> > Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I don't
>> know
>> > how to interpret a scope reading on a stepper,(more the willing to read
>> > anything you might comment on here) but with the delay set to 2 I get
>the
>> > best performance i.e. seems to get most force, but it skips steps, at
>> other
>> > delays, say just like 4 or so, or even 30, 35 it skips a lotta steps
and
>> > auto reverses at the slightest actuation force, like if I touch the
>> > actuator, it will back right up.
>> > Anyway this thing runs great with the delay set to 2 but I need more
>> > reliability, no skipped steps.
>> >
>> > I will look into the Slo Syn stepper.
>> >
>> > Also, I had a 15v zener on it, just like the Allegro spec sheet for the
>> > UND2544B.
>> >
>> > Thanks, no matter how late, I'm just glad I got your post, there been a
>> > pretty big increase in the number of post recently, though they're all
>> > pretty interesting.
>> >
>> > Mark
>> >
>> >
Original Message
>> > From: rjmca <rjmca@w...>
>> > To: basicstamps@egroups.com <basicstamps@egroups.com>
>> > Date: Tuesday, April 11, 2000 6:34 PM
>> > Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >
>> >
>> > >Pardon the delayed response, but I just noticed that you have delay=2
>in
>> > >your code. I have used a Slo-Syn stepper and a geared stepper from
>> Airpax.
>> > >Mine will not even run with a delay of only 2 ms. In both cases,
>torque
>> > >falls off below ~25 ms. If you look with a scope, you can see that
>coil
>> > >current doesn't have time to decay, (because of inductance), at too
>high
>> a
>> > >stepping rate. In addition, mechanical inertia also eats up torque at
>> high
>> > >rates. The max rate depends on the particular stepper, but I will bet
>> that
>> > >2 ms is way too fast for your motor. The rate can be boosted somewhat
>by
>> a
>> > >zener in your clamp circuit.
>> > >
>> > >Better late than never?
>> > >Ray McArthur
>> > >
>> > >
Original Message
>> > >From: techno_masai <plunkettm@e...>
>> > >To: <basicstamps@egroups.com>
>> > >Sent: Saturday, April 01, 2000 10:26 PM
>> > >Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> > >
>> > >
>> > >> Hi all:
>> > >>
>> > >> If anyone has worked with these Airpax stepper motor linear
actuators
>> > give
>> > >> me a holler please.
>> > >> They don't seem to have any significant actuation force. Is the low
>$9
>> > >buck
>> > >> price a tip off? Guess I answered my own question, but any feed back
>on
>> > >this
>> > >> is welcome. So if you pay big bucks the thing is going to have 1 LBF
>or
>> > >so?
>> > >>
>> > >> Here's my code if anyone is interested:
>> > >> '
>> > >> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO
>P/N
>> > >> 162587)
>> > >> '3/31/00 TECHNO_MASAI-M.PLUNKETT
>> > >> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
>> > >> 'TWO WIRE CONTROL OF STEPPER,
>> > >> 'STEPPER WIRE DIAGRAM TO '2544B
>> > >> 'ORG PIN 8
>> > >> 'BLK PIN 6
>> > >> 'BRN PIN 3
>> > >> 'YEL PIN 1
>> > >> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT
>WON'T
>> > >PRINT
>> > >> OUT UNLESS YOU '"PRINT AS IMAGE".
>> > >>
>> > >> DIRS = %0000000000000111
>> > >>
>> > >> CTR VAR WORD
>> > >> DELAY VAR WORD
>> > >> STEPS VAR WORD
>> > >>
>> > >> COIL1_2 CON 0
>> > >> COIL3_4 CON 1
>> > >>
>> > >> DELAY = 2
>> > >> STEPS = 50
>> > >>
>> > >> 'Retract
>> > >>
>> > >> FOR CTR = 1 TO STEPS
>> > >>
>> > >> LOW COIL1_2
>> > >> HIGH COIL3_4
>> > >> PAUSE DELAY
>> > >>
>> > >> LOW COIL1_2
>> > >> LOW COIL3_4
>> > >> PAUSE DELAY
>> > >>
>> > >> HIGH COIL1_2
>> > >> LOW COIL3_4
>> > >> PAUSE DELAY
>> > >>
>> > >> HIGH COIL1_2
>> > >> HIGH COIL3_4
>> > >> PAUSE DELAY
>> > >>
>> > >> NEXT
>> > >>
>> > >> 'EXTEND
>> > >>
>> > >> FOR CTR = 1 TO STEPS
>> > >>
>> > >> HIGH COIL1_2
>> > >> HIGH COIL3_4
>> > >> PAUSE DELAY
>> > >>
>> > >> HIGH COIL1_2
>> > >> LOW COIL3_4
>> > >> PAUSE DELAY
>> > >>
>> > >> LOW COIL1_2
>> > >> LOW COIL3_4
>> > >> PAUSE DELAY
>> > >>
>> > >> LOW COIL1_2
>> > >> HIGH COIL3_4
>> > >> PAUSE DELAY
>> > >>
>> > >> NEXT
>> > >>
>> > >> END
>
>
>
>
>
>
Thanks for the detailed post, all very interesting and great stuff.
I guess what threw me off on the UDN2544 was that on the Allegro spec sheet
front page under Features it says "Inputs configured for Unipolar Stepper
Motors", so I guess you can drive a bipolar stepper with unipolar inputs?
Will check out the links you posted, especially on the EDE-1200 Uni-Polar
Stepper ASIC
I look forward to checking out their EDE-1200 App Note regarding (Airpax)
Linear Actuators big time.
Have you worked at all with digital encoders from US Digital, that will be
probably the next thing I'll be tackling once I get the Airpax up and
running.
Mark
Original Message
From: Bruce Bates <bvbates@u...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Cc: Todd Peterson <toddp@e...>
Date: Thursday, April 13, 2000 9:49 AM
Subject: Re: [noparse][[/noparse]basicstamps] [noparse][[/noparse]long] 2 pin BSC2 to stepper
>At 08:08 PM 4/12/00 -0700, techno_masai promulgated:
>
> [noparse][[/noparse]Apologies to all for the length of this post, but I felt the
> information important to many Stampers - due to the fairly
> recent availability of linear actuators in the surplus catalogs,
> here in the US]
>
>Mark and Ray:
>
>Sorry for my "delayed" response as well. Either my ISP or the eGroups mail
>monster ate my earlier reply to this 'thread' <sigh>.
>
>You might take a look at this reference Mark and confirm a recollection I
>have -
>[noparse][[/noparse] http://www.thomsonmotors.com/airpax/airpax.htm ] in the center picture
>labelled
>
> " Value Added Products - "
> " Geared Motors and Digital "
> " Linear Actuators "
>
>and take a look at the linear actuator at the bottom of the picture -
>center of
>the frame. If that is what the Jameco (Airpax) linear actuator looks like,
>you
>may want to continue with that lead and this note. If so,
>
>The Thomson Industries (Airpax) series numbers are:
>
> K92100 and L92100 and are called "Digital Linear Actuators"
>
>Although there is no document number on the literature I personally have
>before me, the title/ref is:
>
>"Product Selection and Engineering Guide", Thomson (Airpax Mechatronics),
>Thomson Industries, 7 McKee Place, Port Washington, NY, 11050, USA;
>1-203-271-6400; www.thomsonmotors.com
>
>and
> WWW: www.thomsonindustries.com (US HQ Corporate Site)
>
> E-Mail: litrequest@t... US Toll-Free 1-800-554-8466
> Literature Req. No. 12-01-000-6001 US Fax 1-800-445-0329
> or 1-516-883-9039 Int'l
>
> Other E-Mail: GB/Europe info@t... ASIA airpax@t...
>
>It can be obtained by download from that same website noted above
>[noparse][[/noparse] www.thomsonmotors.com/airpax ] in the Catalog Section, or apparently by
>requesting Literature No. 12-01-000-6001 by e-mail (see refs above);
>various torque curves are shown there as well.
>
>Personally, I think this piece of literature is a (device specific) "must
>have",
>and I obtained mine by Snail Mail - some time ago. Whether it can be
>ordered like
>that today, I don't know for sure. An inquiry at the website might
>determine that.
>
>The reason I view it as a "must have" is from the pov that there is very
>little
>in the way of documentation on linear actuators (in general), and it has
>been my experience that most of the units available (new, surplus,
>liquidated, etc) seem
>to be (at least similar) to those listed in this Thomson (Airpax) catalog.
>
>There is a more important reason yet - if one looks closely at the
>documentation (I can't speak for the download, although I would hope it
>would concur), one comes to realization that these must be driven as
>UNI-POLAR steppers would be driven. This
>ties us back to the original question <whew !>.
>
>The Allegro Chip mentioned is for BI-POLAR Steppers. At this juncture the
>best recommendation I could make, would be to hold on to the Allegro chip
>for some
>future adventure with BI-POLAR steppers, and wander over the the E-Lab
site:
>[noparse][[/noparse] www.elab.com ] and take a look at their EDE-1200 Uni-Polar Stepper ASIC
>Chip.
>
>Why ?
>
>In truth any UNI-POLAR stepper drive chip might do, from scads of
>manufacturers.
>It would be my guess that some additional torque insight might be required,
>however, and the quickest route I know to FIRST-HAND information is via
>E-Labs and the Prez. there, Todd Peterson [noparse][[/noparse]EMAIL: "Todd Peterson"
><toddp@e...> ] who is kind
>enough to monitor this list.
>
>Perhaps Elabs might take this on as a small documentation side-project
>(hint, hint),
>at some future date. There is additional information I would be happy to
>offer for reference. An Elabs EDE-1200 App Note regarding (Airpax) Linear
>Actuators, relative
>to microprocessors in general, and the Stamp family in specific would be
>MOST welcome by all, I'm sure (least *I* would love to have one <smile>).
>
>The additional specific topic(s) of "torque" + "UN-POLAR" + "EDE-1200" (or
>other
>chips) might be a topic for a brief E.E. "White Paper" (as are becoming so
>popular today on niche subjects <weird !>). YMMV on that one.
>
>The tenative and general conclusions I have reached from what I've read,
and
>what I've learned thru experimetation - are:
>
>FULL, HALF, and MICRO-STEPPING methods are available from UNI-POLAR drive
>chips,
>and torque curves will vary accordingly. More than that, gearing may be
>required, depending on the application. Actuators aren't generally
>appropriate for use in
>stepper motor applications, but stepper motors (to an extent) might be used
>like
>a linear actuator (Acme/ball screw drive and helix shaft). Individual
>applications
>may vary from that general premise.
>
>Generally SLO SYN (type and brand) motors are expensive (even surplus) but
>sometimes they are quite necessary; again, depending on the application.
>
>If the Airpax unit is the one I suspect it is - it is intended for LIGHT
>DUTY application ONLY. Low cost, light loads and like factors are
>consistant with these Airpax (surplus) units.
>
>Hope that helps.
>
>Regards,
>
>Bruce
>
>
>>Hi Ray:
>>
>>Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I don't
know
>>how to interpret a scope reading on a stepper,(more the willing to read
>>anything you might comment on here) but with the delay set to 2 I get the
>>best performance i.e. seems to get most force, but it skips steps, at
other
>>delays, say just like 4 or so, or even 30, 35 it skips a lotta steps and
>>auto reverses at the slightest actuation force, like if I touch the
>>actuator, it will back right up.
>>Anyway this thing runs great with the delay set to 2 but I need more
>>reliability, no skipped steps.
>>
>>I will look into the Slo Syn stepper.
>>
>>Also, I had a 15v zener on it, just like the Allegro spec sheet for the
>>UND2544B.
>>
>>Thanks, no matter how late, I'm just glad I got your post, there been a
>>pretty big increase in the number of post recently, though they're all
>>pretty interesting.
>>
>>Mark
>>
>>
Original Message
>>From: rjmca <rjmca@w...>
>>To: basicstamps@egroups.com <basicstamps@egroups.com>
>>Date: Tuesday, April 11, 2000 6:34 PM
>>Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>>
>>
>>>Pardon the delayed response, but I just noticed that you have delay=2 in
>>>your code. I have used a Slo-Syn stepper and a geared stepper from
Airpax.
>>>Mine will not even run with a delay of only 2 ms. In both cases, torque
>>>falls off below ~25 ms. If you look with a scope, you can see that coil
>>>current doesn't have time to decay, (because of inductance), at too high
a
>>>stepping rate. In addition, mechanical inertia also eats up torque at
high
>>>rates. The max rate depends on the particular stepper, but I will bet
that
>>>2 ms is way too fast for your motor. The rate can be boosted somewhat by
a
>>>zener in your clamp circuit.
>>>
>>>Better late than never?
>>>Ray McArthur
>>>
>>>
Original Message
>>>From: techno_masai <plunkettm@e...>
>>>To: <basicstamps@egroups.com>
>>>Sent: Saturday, April 01, 2000 10:26 PM
>>>Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>>>
>>>
>>>> Hi all:
>>>>
>>>> If anyone has worked with these Airpax stepper motor linear actuators
>>give
>>>> me a holler please.
>>>> They don't seem to have any significant actuation force. Is the low $9
>>>buck
>>>> price a tip off? Guess I answered my own question, but any feed back on
>>>this
>>>> is welcome. So if you pay big bucks the thing is going to have 1 LBF or
>>>so?
>>>>
>>>> Here's my code if anyone is interested:
>>>> '
>>>> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO P/N
>>>> 162587)
>>>> '3/31/00 TECHNO_MASAI-M.PLUNKETT
>>>> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
>>>> 'TWO WIRE CONTROL OF STEPPER,
>>>> 'STEPPER WIRE DIAGRAM TO '2544B
>>>> 'ORG PIN 8
>>>> 'BLK PIN 6
>>>> 'BRN PIN 3
>>>> 'YEL PIN 1
>>>> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT WON'T
>>>PRINT
>>>> OUT UNLESS YOU '"PRINT AS IMAGE".
>>>>
>>>> DIRS = %0000000000000111
>>>>
>>>> CTR VAR WORD
>>>> DELAY VAR WORD
>>>> STEPS VAR WORD
>>>>
>>>> COIL1_2 CON 0
>>>> COIL3_4 CON 1
>>>>
>>>> DELAY = 2
>>>> STEPS = 50
>>>>
>>>> 'Retract
>>>>
>>>> FOR CTR = 1 TO STEPS
>>>>
>>>> LOW COIL1_2
>>>> HIGH COIL3_4
>>>> PAUSE DELAY
>>>>
>>>> LOW COIL1_2
>>>> LOW COIL3_4
>>>> PAUSE DELAY
>>>>
>>>> HIGH COIL1_2
>>>> LOW COIL3_4
>>>> PAUSE DELAY
>>>>
>>>> HIGH COIL1_2
>>>> HIGH COIL3_4
>>>> PAUSE DELAY
>>>>
>>>> NEXT
>>>>
>>>> 'EXTEND
>>>>
>>>> FOR CTR = 1 TO STEPS
>>>>
>>>> HIGH COIL1_2
>>>> HIGH COIL3_4
>>>> PAUSE DELAY
>>>>
>>>> HIGH COIL1_2
>>>> LOW COIL3_4
>>>> PAUSE DELAY
>>>>
>>>> LOW COIL1_2
>>>> LOW COIL3_4
>>>> PAUSE DELAY
>>>>
>>>> LOW COIL1_2
>>>> HIGH COIL3_4
>>>> PAUSE DELAY
>>>>
>>>> NEXT
>>>>
>>>> END
>>>>
>>>>
>>>>
>>>>
-
>>>>
>>>> eGroups.com home: http://www.egroups.com/group/basicstamps
>>>> http://www.egroups.com - Simplifying group communications
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
>
>
>
Your wire colors are different than I thought. Could you give me a list of
all the wire colors and resistance readings between them? I am interested
in your project because I am considering buying one of those steppers.
Thanks,
Ray McArthur
Original Message
From: techno_masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Friday, April 14, 2000 5:21 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> Hi Ray:
>
> Thanks for looking over my code and hook up, seems like I went thru every
> permutation on the wiring from the UDN to the AirPax, but will check what
> you suggested.
>
> On the Airpax from Jameco, both the positive wires are red, I connected
them
> together to 12v. I ran a zener 2EZ15D5MSCT from the same 12v with the
zigzag
> end pointing to the UDN and ran it to pins 2 and 7.
>
> Am planning on using the look up table once I get the Airpax up and
running
> decently.
>
> The resistance between the brn & org is 115 ohms, between the brn & red
its
> 59 ohms, between the brn & the other red(no green wire on this Airpax
unit)
> is 0.
>
> Per Al Williams book I though I had it figured out.
>
> Mark
>
>
Original Message
> From: rjmca <rjmca@w...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Date: Thursday, April 13, 2000 2:23 PM
> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
> >Mark:
> >
> >I just looked at your code and may have found a problem. Assuming your
> >motor color codes follow the Airpax codes shown on page 101 of the V1.9
> >manual, and the wires are connected as you say in your code comments, the
> >coil phases are incorrect. They should be:
> >
> >red & green to positive
> >yellow to UDN pin 1
> >orange to pin 3
> >brown to pin 8
> >black to pin 6
> >
> >The code looks OK, except you will get a "glitch" when backing up. You
can
> >greatly abbreviate the code you are using by using LOOKUP as in the stamp
> >manual, page 43.
> >
> >Good luck,
> >Ray McArthur
> >
> >
Original Message
> >From: rjmca <rjmca@w...>
> >To: <basicstamps@egroups.com>
> >Sent: Thursday, April 13, 2000 12:28 AM
> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >
> >
> >> Mark:
> >>
> >> The behavior you describe is bizarre. Normally, skipped steps occur at
> >> too-high rates. Could you have the coils connected wrong, or an
> incorrect
> >> step? When my code had errors, the motor was quite erratic. I'll
check
> >> your code when we have a chance.
> >>
> >> I just looked at the Jameco catalog... they don't give coil
resistance.
> >> Did you measure it? The steppers I messed with are rotary units, but
> >yours
> >> simply looks like a rotary stepper with a leadscrew attached, so I
would
> >> expect it to be similar in operation. The Airpax products I have seen
> >were
> >> decent quality.
> >>
> >> Ray
> >>
> >>
Original Message
> >> From: techno_masai <plunkettm@e...>
> >> To: <basicstamps@egroups.com>
> >> Sent: Wednesday, April 12, 2000 11:08 PM
> >> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >>
> >>
> >> > Hi Ray:
> >> >
> >> > Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I
don't
> >> know
> >> > how to interpret a scope reading on a stepper,(more the willing to
read
> >> > anything you might comment on here) but with the delay set to 2 I get
> >the
> >> > best performance i.e. seems to get most force, but it skips steps, at
> >> other
> >> > delays, say just like 4 or so, or even 30, 35 it skips a lotta steps
> and
> >> > auto reverses at the slightest actuation force, like if I touch the
> >> > actuator, it will back right up.
> >> > Anyway this thing runs great with the delay set to 2 but I need more
> >> > reliability, no skipped steps.
> >> >
> >> > I will look into the Slo Syn stepper.
> >> >
> >> > Also, I had a 15v zener on it, just like the Allegro spec sheet for
the
> >> > UND2544B.
> >> >
> >> > Thanks, no matter how late, I'm just glad I got your post, there been
a
> >> > pretty big increase in the number of post recently, though they're
all
> >> > pretty interesting.
> >> >
> >> > Mark
> >> >
> >> >
Original Message
> >> > From: rjmca <rjmca@w...>
> >> > To: basicstamps@egroups.com <basicstamps@egroups.com>
> >> > Date: Tuesday, April 11, 2000 6:34 PM
> >> > Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >> >
> >> >
> >> > >Pardon the delayed response, but I just noticed that you have
delay=2
> >in
> >> > >your code. I have used a Slo-Syn stepper and a geared stepper from
> >> Airpax.
> >> > >Mine will not even run with a delay of only 2 ms. In both cases,
> >torque
> >> > >falls off below ~25 ms. If you look with a scope, you can see that
> >coil
> >> > >current doesn't have time to decay, (because of inductance), at too
> >high
> >> a
> >> > >stepping rate. In addition, mechanical inertia also eats up torque
at
> >> high
> >> > >rates. The max rate depends on the particular stepper, but I will
bet
> >> that
> >> > >2 ms is way too fast for your motor. The rate can be boosted
somewhat
> >by
> >> a
> >> > >zener in your clamp circuit.
> >> > >
> >> > >Better late than never?
> >> > >Ray McArthur
> >> > >
> >> > >
Original Message
> >> > >From: techno_masai <plunkettm@e...>
> >> > >To: <basicstamps@egroups.com>
> >> > >Sent: Saturday, April 01, 2000 10:26 PM
> >> > >Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >> > >
> >> > >
> >> > >> Hi all:
> >> > >>
> >> > >> If anyone has worked with these Airpax stepper motor linear
> actuators
> >> > give
> >> > >> me a holler please.
> >> > >> They don't seem to have any significant actuation force. Is the
low
> >$9
> >> > >buck
> >> > >> price a tip off? Guess I answered my own question, but any feed
back
> >on
> >> > >this
> >> > >> is welcome. So if you pay big bucks the thing is going to have 1
LBF
> >or
> >> > >so?
> >> > >>
> >> > >> Here's my code if anyone is interested:
> >> > >> '
> >> > >> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218
(JAMECO
> >P/N
> >> > >> 162587)
> >> > >> '3/31/00 TECHNO_MASAI-M.PLUNKETT
> >> > >> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
> >> > >> 'TWO WIRE CONTROL OF STEPPER,
> >> > >> 'STEPPER WIRE DIAGRAM TO '2544B
> >> > >> 'ORG PIN 8
> >> > >> 'BLK PIN 6
> >> > >> 'BRN PIN 3
> >> > >> 'YEL PIN 1
> >> > >> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT
> >WON'T
> >> > >PRINT
> >> > >> OUT UNLESS YOU '"PRINT AS IMAGE".
> >> > >>
> >> > >> DIRS = %0000000000000111
> >> > >>
> >> > >> CTR VAR WORD
> >> > >> DELAY VAR WORD
> >> > >> STEPS VAR WORD
> >> > >>
> >> > >> COIL1_2 CON 0
> >> > >> COIL3_4 CON 1
> >> > >>
> >> > >> DELAY = 2
> >> > >> STEPS = 50
> >> > >>
> >> > >> 'Retract
> >> > >>
> >> > >> FOR CTR = 1 TO STEPS
> >> > >>
> >> > >> LOW COIL1_2
> >> > >> HIGH COIL3_4
> >> > >> PAUSE DELAY
> >> > >>
> >> > >> LOW COIL1_2
> >> > >> LOW COIL3_4
> >> > >> PAUSE DELAY
> >> > >>
> >> > >> HIGH COIL1_2
> >> > >> LOW COIL3_4
> >> > >> PAUSE DELAY
> >> > >>
> >> > >> HIGH COIL1_2
> >> > >> HIGH COIL3_4
> >> > >> PAUSE DELAY
> >> > >>
> >> > >> NEXT
> >> > >>
> >> > >> 'EXTEND
> >> > >>
> >> > >> FOR CTR = 1 TO STEPS
> >> > >>
> >> > >> HIGH COIL1_2
> >> > >> HIGH COIL3_4
> >> > >> PAUSE DELAY
> >> > >>
> >> > >> HIGH COIL1_2
> >> > >> LOW COIL3_4
> >> > >> PAUSE DELAY
> >> > >>
> >> > >> LOW COIL1_2
> >> > >> LOW COIL3_4
> >> > >> PAUSE DELAY
> >> > >>
> >> > >> LOW COIL1_2
> >> > >> HIGH COIL3_4
> >> > >> PAUSE DELAY
> >> > >>
> >> > >> NEXT
> >> > >>
> >> > >> END
> >
> >
> >
> >
> >
> >
>
>
>
>
>Hi Bruce:
>
>Thanks for the detailed post, all very interesting and great stuff.
>
>I guess what threw me off on the UDN2544 was that on the Allegro spec sheet
>front page under Features it says "Inputs configured for Unipolar Stepper
>Motors", so I guess you can drive a bipolar stepper with unipolar inputs?
If the truth would be know bi-polar/uni-polar are almost connectivity
methods, but
it kinda fails the true test. The direct answer to your question is yes.
>
>Will check out the links you posted, especially on the EDE-1200 Uni-Polar
>Stepper ASIC
You will appreciate the docs (free) and the assistance, I can assure you.
>
>I look forward to checking out their EDE-1200 App Note regarding (Airpax)
>Linear Actuators big time.
I surely am in no position except to HINT at something like that <smile>.
>
>Have you worked at all with digital encoders from US Digital, that will be
>probably the next thing I'll be tackling once I get the Airpax up and
>running.
Some, but not extensively. I had an application I was going to get involved in
about 6 months ago, but it never got off the ground. I have the docs
though, and various "typical" examples of various encoders. I never
filtered thru it to see if there was one which mentioned the US Digital
ones. Which encoder were you looking
to use, and what is the exact application ?
Regards,
Bruce
>
>Mark
The UDN 2544 should drive a unipolar stepper if connected as their example
circuit that you are using. If one of your stamp pins drives UDN pins 9&10,
and the other stamp pin drives UDN pins 15&16, there should be no problem.
I have an EDE1200 driving a stepper, and it works fine, but so should your
UDN.
Will check out the Airpax site Bruce mentioned, but I think I already have
it downloaded.
Thanks,
Ray McArthur
Original Message
From: techno_masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Friday, April 14, 2000 5:45 PM
Subject: Re: [noparse][[/noparse]basicstamps] [noparse][[/noparse]long] 2 pin BSC2 to stepper
> Hi Bruce:
>
> Thanks for the detailed post, all very interesting and great stuff.
>
> I guess what threw me off on the UDN2544 was that on the Allegro spec
sheet
> front page under Features it says "Inputs configured for Unipolar Stepper
> Motors", so I guess you can drive a bipolar stepper with unipolar inputs?
>
> Will check out the links you posted, especially on the EDE-1200 Uni-Polar
> Stepper ASIC
>
> I look forward to checking out their EDE-1200 App Note regarding (Airpax)
> Linear Actuators big time.
>
> Have you worked at all with digital encoders from US Digital, that will be
> probably the next thing I'll be tackling once I get the Airpax up and
> running.
>
> Mark
>
>
Original Message
> From: Bruce Bates <bvbates@u...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Cc: Todd Peterson <toddp@e...>
> Date: Thursday, April 13, 2000 9:49 AM
> Subject: Re: [noparse][[/noparse]basicstamps] [noparse][[/noparse]long] 2 pin BSC2 to stepper
>
>
> >At 08:08 PM 4/12/00 -0700, techno_masai promulgated:
> >
> > [noparse][[/noparse]Apologies to all for the length of this post, but I felt the
> > information important to many Stampers - due to the fairly
> > recent availability of linear actuators in the surplus catalogs,
> > here in the US]
> >
> >Mark and Ray:
> >
> >Sorry for my "delayed" response as well. Either my ISP or the eGroups
mail
> >monster ate my earlier reply to this 'thread' <sigh>.
> >
> >You might take a look at this reference Mark and confirm a recollection I
> >have -
> >[noparse][[/noparse] http://www.thomsonmotors.com/airpax/airpax.htm ] in the center picture
> >labelled
> >
> > " Value Added Products - "
> > " Geared Motors and Digital "
> > " Linear Actuators "
> >
> >and take a look at the linear actuator at the bottom of the picture -
> >center of
> >the frame. If that is what the Jameco (Airpax) linear actuator looks
like,
> >you
> >may want to continue with that lead and this note. If so,
> >
> >The Thomson Industries (Airpax) series numbers are:
> >
> > K92100 and L92100 and are called "Digital Linear Actuators"
> >
> >Although there is no document number on the literature I personally have
> >before me, the title/ref is:
> >
> >"Product Selection and Engineering Guide", Thomson (Airpax Mechatronics),
> >Thomson Industries, 7 McKee Place, Port Washington, NY, 11050, USA;
> >1-203-271-6400; www.thomsonmotors.com
> >
> >and
> > WWW: www.thomsonindustries.com (US HQ Corporate Site)
> >
> > E-Mail: litrequest@t... US Toll-Free 1-800-554-8466
> > Literature Req. No. 12-01-000-6001 US Fax 1-800-445-0329
> > or 1-516-883-9039 Int'l
> >
> > Other E-Mail: GB/Europe info@t... ASIA airpax@t...
> >
> >It can be obtained by download from that same website noted above
> >[noparse][[/noparse] www.thomsonmotors.com/airpax ] in the Catalog Section, or apparently by
> >requesting Literature No. 12-01-000-6001 by e-mail (see refs above);
> >various torque curves are shown there as well.
> >
> >Personally, I think this piece of literature is a (device specific) "must
> >have",
> >and I obtained mine by Snail Mail - some time ago. Whether it can be
> >ordered like
> >that today, I don't know for sure. An inquiry at the website might
> >determine that.
> >
> >The reason I view it as a "must have" is from the pov that there is very
> >little
> >in the way of documentation on linear actuators (in general), and it has
> >been my experience that most of the units available (new, surplus,
> >liquidated, etc) seem
> >to be (at least similar) to those listed in this Thomson (Airpax)
catalog.
> >
> >There is a more important reason yet - if one looks closely at the
> >documentation (I can't speak for the download, although I would hope it
> >would concur), one comes to realization that these must be driven as
> >UNI-POLAR steppers would be driven. This
> >ties us back to the original question <whew !>.
> >
> >The Allegro Chip mentioned is for BI-POLAR Steppers. At this juncture the
> >best recommendation I could make, would be to hold on to the Allegro chip
> >for some
> >future adventure with BI-POLAR steppers, and wander over the the E-Lab
> site:
> >[noparse][[/noparse] www.elab.com ] and take a look at their EDE-1200 Uni-Polar Stepper ASIC
> >Chip.
> >
> >Why ?
> >
> >In truth any UNI-POLAR stepper drive chip might do, from scads of
> >manufacturers.
> >It would be my guess that some additional torque insight might be
required,
> >however, and the quickest route I know to FIRST-HAND information is via
> >E-Labs and the Prez. there, Todd Peterson [noparse][[/noparse]EMAIL: "Todd Peterson"
> ><toddp@e...> ] who is kind
> >enough to monitor this list.
> >
> >Perhaps Elabs might take this on as a small documentation side-project
> >(hint, hint),
> >at some future date. There is additional information I would be happy to
> >offer for reference. An Elabs EDE-1200 App Note regarding (Airpax) Linear
> >Actuators, relative
> >to microprocessors in general, and the Stamp family in specific would be
> >MOST welcome by all, I'm sure (least *I* would love to have one <smile>).
> >
> >The additional specific topic(s) of "torque" + "UN-POLAR" + "EDE-1200"
(or
> >other
> >chips) might be a topic for a brief E.E. "White Paper" (as are becoming
so
> >popular today on niche subjects <weird !>). YMMV on that one.
> >
> >The tenative and general conclusions I have reached from what I've read,
> and
> >what I've learned thru experimetation - are:
> >
> >FULL, HALF, and MICRO-STEPPING methods are available from UNI-POLAR drive
> >chips,
> >and torque curves will vary accordingly. More than that, gearing may be
> >required, depending on the application. Actuators aren't generally
> >appropriate for use in
> >stepper motor applications, but stepper motors (to an extent) might be
used
> >like
> >a linear actuator (Acme/ball screw drive and helix shaft). Individual
> >applications
> >may vary from that general premise.
> >
> >Generally SLO SYN (type and brand) motors are expensive (even surplus)
but
> >sometimes they are quite necessary; again, depending on the application.
> >
> >If the Airpax unit is the one I suspect it is - it is intended for LIGHT
> >DUTY application ONLY. Low cost, light loads and like factors are
> >consistant with these Airpax (surplus) units.
> >
> >Hope that helps.
> >
> >Regards,
> >
> >Bruce
> >
> >
> >>Hi Ray:
> >>
> >>Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I don't
> know
> >>how to interpret a scope reading on a stepper,(more the willing to read
> >>anything you might comment on here) but with the delay set to 2 I get
the
> >>best performance i.e. seems to get most force, but it skips steps, at
> other
> >>delays, say just like 4 or so, or even 30, 35 it skips a lotta steps and
> >>auto reverses at the slightest actuation force, like if I touch the
> >>actuator, it will back right up.
> >>Anyway this thing runs great with the delay set to 2 but I need more
> >>reliability, no skipped steps.
> >>
> >>I will look into the Slo Syn stepper.
> >>
> >>Also, I had a 15v zener on it, just like the Allegro spec sheet for the
> >>UND2544B.
> >>
> >>Thanks, no matter how late, I'm just glad I got your post, there been a
> >>pretty big increase in the number of post recently, though they're all
> >>pretty interesting.
> >>
> >>Mark
> >>
> >>
Original Message
> >>From: rjmca <rjmca@w...>
> >>To: basicstamps@egroups.com <basicstamps@egroups.com>
> >>Date: Tuesday, April 11, 2000 6:34 PM
> >>Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >>
> >>
> >>>Pardon the delayed response, but I just noticed that you have delay=2
in
> >>>your code. I have used a Slo-Syn stepper and a geared stepper from
> Airpax.
> >>>Mine will not even run with a delay of only 2 ms. In both cases,
torque
> >>>falls off below ~25 ms. If you look with a scope, you can see that
coil
> >>>current doesn't have time to decay, (because of inductance), at too
high
> a
> >>>stepping rate. In addition, mechanical inertia also eats up torque at
> high
> >>>rates. The max rate depends on the particular stepper, but I will bet
> that
> >>>2 ms is way too fast for your motor. The rate can be boosted somewhat
by
> a
> >>>zener in your clamp circuit.
> >>>
> >>>Better late than never?
> >>>Ray McArthur
> >>>
> >>>
Original Message
> >>>From: techno_masai <plunkettm@e...>
> >>>To: <basicstamps@egroups.com>
> >>>Sent: Saturday, April 01, 2000 10:26 PM
> >>>Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >>>
> >>>
> >>>> Hi all:
> >>>>
> >>>> If anyone has worked with these Airpax stepper motor linear actuators
> >>give
> >>>> me a holler please.
> >>>> They don't seem to have any significant actuation force. Is the low
$9
> >>>buck
> >>>> price a tip off? Guess I answered my own question, but any feed back
on
> >>>this
> >>>> is welcome. So if you pay big bucks the thing is going to have 1 LBF
or
> >>>so?
> >>>>
> >>>> Here's my code if anyone is interested:
> >>>> '
> >>>> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO
P/N
> >>>> 162587)
> >>>> '3/31/00 TECHNO_MASAI-M.PLUNKETT
> >>>> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
> >>>> 'TWO WIRE CONTROL OF STEPPER,
> >>>> 'STEPPER WIRE DIAGRAM TO '2544B
> >>>> 'ORG PIN 8
> >>>> 'BLK PIN 6
> >>>> 'BRN PIN 3
> >>>> 'YEL PIN 1
> >>>> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT
WON'T
> >>>PRINT
> >>>> OUT UNLESS YOU '"PRINT AS IMAGE".
> >>>>
> >>>> DIRS = %0000000000000111
> >>>>
> >>>> CTR VAR WORD
> >>>> DELAY VAR WORD
> >>>> STEPS VAR WORD
> >>>>
> >>>> COIL1_2 CON 0
> >>>> COIL3_4 CON 1
> >>>>
> >>>> DELAY = 2
> >>>> STEPS = 50
> >>>>
> >>>> 'Retract
> >>>>
> >>>> FOR CTR = 1 TO STEPS
> >>>>
> >>>> LOW COIL1_2
> >>>> HIGH COIL3_4
> >>>> PAUSE DELAY
> >>>>
> >>>> LOW COIL1_2
> >>>> LOW COIL3_4
> >>>> PAUSE DELAY
> >>>>
> >>>> HIGH COIL1_2
> >>>> LOW COIL3_4
> >>>> PAUSE DELAY
> >>>>
> >>>> HIGH COIL1_2
> >>>> HIGH COIL3_4
> >>>> PAUSE DELAY
> >>>>
> >>>> NEXT
> >>>>
> >>>> 'EXTEND
> >>>>
> >>>> FOR CTR = 1 TO STEPS
> >>>>
> >>>> HIGH COIL1_2
> >>>> HIGH COIL3_4
> >>>> PAUSE DELAY
> >>>>
> >>>> HIGH COIL1_2
> >>>> LOW COIL3_4
> >>>> PAUSE DELAY
> >>>>
> >>>> LOW COIL1_2
> >>>> LOW COIL3_4
> >>>> PAUSE DELAY
> >>>>
> >>>> LOW COIL1_2
> >>>> HIGH COIL3_4
> >>>> PAUSE DELAY
> >>>>
> >>>> NEXT
> >>>>
> >>>> END
> >>>>
> >>>>
> >>>>
>
>>>>
> -
> >>>>
> >>>> eGroups.com home: http://www.egroups.com/group/basicstamps
> >>>> http://www.egroups.com - Simplifying group communications
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
>
>
>
>
Here's what I got:
red-red1 0
yel-org 0
yel-red 59
yel-red1 0
yel-blk 120
yel-brn 0
org-brn 116
org-red 0
org-red1 57
org-brn 116
org-blk 0
brn-red 0
brn-red1 59
brn-blk 0
blk-red1 0
blk-red 60
Hope I got them all. I arbitrarily called one of the two identical red wires
red1.
The label on this Airpax stepper linear actuator has these numbers A92218,
8232
Hope to hear about your luck with these linear actuators.
Mark
Original Message
From: rjmca <rjmca@w...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Friday, April 14, 2000 2:53 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>Mark:
>Your wire colors are different than I thought. Could you give me a list of
>all the wire colors and resistance readings between them? I am interested
>in your project because I am considering buying one of those steppers.
>
>Thanks,
>Ray McArthur
>
>
Original Message
>From: techno_masai <plunkettm@e...>
>To: <basicstamps@egroups.com>
>Sent: Friday, April 14, 2000 5:21 PM
>Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
>> Hi Ray:
>>
>> Thanks for looking over my code and hook up, seems like I went thru every
>> permutation on the wiring from the UDN to the AirPax, but will check what
>> you suggested.
>>
>> On the Airpax from Jameco, both the positive wires are red, I connected
>them
>> together to 12v. I ran a zener 2EZ15D5MSCT from the same 12v with the
>zigzag
>> end pointing to the UDN and ran it to pins 2 and 7.
>>
>> Am planning on using the look up table once I get the Airpax up and
>running
>> decently.
>>
>> The resistance between the brn & org is 115 ohms, between the brn & red
>its
>> 59 ohms, between the brn & the other red(no green wire on this Airpax
>unit)
>> is 0.
>>
>> Per Al Williams book I though I had it figured out.
>>
>> Mark
>>
>>
Original Message
>> From: rjmca <rjmca@w...>
>> To: basicstamps@egroups.com <basicstamps@egroups.com>
>> Date: Thursday, April 13, 2000 2:23 PM
>> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>>
>>
>> >Mark:
>> >
>> >I just looked at your code and may have found a problem. Assuming your
>> >motor color codes follow the Airpax codes shown on page 101 of the V1.9
>> >manual, and the wires are connected as you say in your code comments,
the
>> >coil phases are incorrect. They should be:
>> >
>> >red & green to positive
>> >yellow to UDN pin 1
>> >orange to pin 3
>> >brown to pin 8
>> >black to pin 6
>> >
>> >The code looks OK, except you will get a "glitch" when backing up. You
>can
>> >greatly abbreviate the code you are using by using LOOKUP as in the
stamp
>> >manual, page 43.
>> >
>> >Good luck,
>> >Ray McArthur
>> >
>> >
Original Message
>> >From: rjmca <rjmca@w...>
>> >To: <basicstamps@egroups.com>
>> >Sent: Thursday, April 13, 2000 12:28 AM
>> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >
>> >
>> >> Mark:
>> >>
>> >> The behavior you describe is bizarre. Normally, skipped steps occur
at
>> >> too-high rates. Could you have the coils connected wrong, or an
>> incorrect
>> >> step? When my code had errors, the motor was quite erratic. I'll
>check
>> >> your code when we have a chance.
>> >>
>> >> I just looked at the Jameco catalog... they don't give coil
>resistance.
>> >> Did you measure it? The steppers I messed with are rotary units, but
>> >yours
>> >> simply looks like a rotary stepper with a leadscrew attached, so I
>would
>> >> expect it to be similar in operation. The Airpax products I have seen
>> >were
>> >> decent quality.
>> >>
>> >> Ray
>> >>
>> >>
Original Message
>> >> From: techno_masai <plunkettm@e...>
>> >> To: <basicstamps@egroups.com>
>> >> Sent: Wednesday, April 12, 2000 11:08 PM
>> >> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >>
>> >>
>> >> > Hi Ray:
>> >> >
>> >> > Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I
>don't
>> >> know
>> >> > how to interpret a scope reading on a stepper,(more the willing to
>read
>> >> > anything you might comment on here) but with the delay set to 2 I
get
>> >the
>> >> > best performance i.e. seems to get most force, but it skips steps,
at
>> >> other
>> >> > delays, say just like 4 or so, or even 30, 35 it skips a lotta steps
>> and
>> >> > auto reverses at the slightest actuation force, like if I touch the
>> >> > actuator, it will back right up.
>> >> > Anyway this thing runs great with the delay set to 2 but I need more
>> >> > reliability, no skipped steps.
>> >> >
>> >> > I will look into the Slo Syn stepper.
>> >> >
>> >> > Also, I had a 15v zener on it, just like the Allegro spec sheet for
>the
>> >> > UND2544B.
>> >> >
>> >> > Thanks, no matter how late, I'm just glad I got your post, there
been
>a
>> >> > pretty big increase in the number of post recently, though they're
>all
>> >> > pretty interesting.
>> >> >
>> >> > Mark
>> >> >
>> >> >
Original Message
>> >> > From: rjmca <rjmca@w...>
>> >> > To: basicstamps@egroups.com <basicstamps@egroups.com>
>> >> > Date: Tuesday, April 11, 2000 6:34 PM
>> >> > Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >> >
>> >> >
>> >> > >Pardon the delayed response, but I just noticed that you have
>delay=2
>> >in
>> >> > >your code. I have used a Slo-Syn stepper and a geared stepper from
>> >> Airpax.
>> >> > >Mine will not even run with a delay of only 2 ms. In both cases,
>> >torque
>> >> > >falls off below ~25 ms. If you look with a scope, you can see that
>> >coil
>> >> > >current doesn't have time to decay, (because of inductance), at too
>> >high
>> >> a
>> >> > >stepping rate. In addition, mechanical inertia also eats up torque
>at
>> >> high
>> >> > >rates. The max rate depends on the particular stepper, but I will
>bet
>> >> that
>> >> > >2 ms is way too fast for your motor. The rate can be boosted
>somewhat
>> >by
>> >> a
>> >> > >zener in your clamp circuit.
>> >> > >
>> >> > >Better late than never?
>> >> > >Ray McArthur
>> >> > >
>> >> > >
Original Message
>> >> > >From: techno_masai <plunkettm@e...>
>> >> > >To: <basicstamps@egroups.com>
>> >> > >Sent: Saturday, April 01, 2000 10:26 PM
>> >> > >Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >> > >
>> >> > >
>> >> > >> Hi all:
>> >> > >>
>> >> > >> If anyone has worked with these Airpax stepper motor linear
>> actuators
>> >> > give
>> >> > >> me a holler please.
>> >> > >> They don't seem to have any significant actuation force. Is the
>low
>> >$9
>> >> > >buck
>> >> > >> price a tip off? Guess I answered my own question, but any feed
>back
>> >on
>> >> > >this
>> >> > >> is welcome. So if you pay big bucks the thing is going to have 1
>LBF
>> >or
>> >> > >so?
>> >> > >>
>> >> > >> Here's my code if anyone is interested:
>> >> > >> '
>> >> > >> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218
>(JAMECO
>> >P/N
>> >> > >> 162587)
>> >> > >> '3/31/00 TECHNO_MASAI-M.PLUNKETT
>> >> > >> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
>> >> > >> 'TWO WIRE CONTROL OF STEPPER,
>> >> > >> 'STEPPER WIRE DIAGRAM TO '2544B
>> >> > >> 'ORG PIN 8
>> >> > >> 'BLK PIN 6
>> >> > >> 'BRN PIN 3
>> >> > >> 'YEL PIN 1
>> >> > >> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT
>> >WON'T
>> >> > >PRINT
>> >> > >> OUT UNLESS YOU '"PRINT AS IMAGE".
>> >> > >>
>> >> > >> DIRS = %0000000000000111
>> >> > >>
>> >> > >> CTR VAR WORD
>> >> > >> DELAY VAR WORD
>> >> > >> STEPS VAR WORD
>> >> > >>
>> >> > >> COIL1_2 CON 0
>> >> > >> COIL3_4 CON 1
>> >> > >>
>> >> > >> DELAY = 2
>> >> > >> STEPS = 50
>> >> > >>
>> >> > >> 'Retract
>> >> > >>
>> >> > >> FOR CTR = 1 TO STEPS
>> >> > >>
>> >> > >> LOW COIL1_2
>> >> > >> HIGH COIL3_4
>> >> > >> PAUSE DELAY
>> >> > >>
>> >> > >> LOW COIL1_2
>> >> > >> LOW COIL3_4
>> >> > >> PAUSE DELAY
>> >> > >>
>> >> > >> HIGH COIL1_2
>> >> > >> LOW COIL3_4
>> >> > >> PAUSE DELAY
>> >> > >>
>> >> > >> HIGH COIL1_2
>> >> > >> HIGH COIL3_4
>> >> > >> PAUSE DELAY
>> >> > >>
>> >> > >> NEXT
>> >> > >>
>> >> > >> 'EXTEND
>> >> > >>
>> >> > >> FOR CTR = 1 TO STEPS
>> >> > >>
>> >> > >> HIGH COIL1_2
>> >> > >> HIGH COIL3_4
>> >> > >> PAUSE DELAY
>> >> > >>
>> >> > >> HIGH COIL1_2
>> >> > >> LOW COIL3_4
>> >> > >> PAUSE DELAY
>> >> > >>
>> >> > >> LOW COIL1_2
>> >> > >> LOW COIL3_4
>> >> > >> PAUSE DELAY
>> >> > >>
>> >> > >> LOW COIL1_2
>> >> > >> HIGH COIL3_4
>> >> > >> PAUSE DELAY
>> >> > >>
>> >> > >> NEXT
>> >> > >>
>> >> > >> END
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>>
>>
>
>
>
>
>
Thanks for the info. From your readings, you should try:
* both reds to plus, like you have.
* brown to UDN pin 3.
* orange to pin 1.
* yellow to pin 8.
* black to pin 6.
Don' forget to try longer delays, like 40 if it's weird.
Let me know how you make out,
Ray McArthur
Original Message
From: techno_masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Friday, April 14, 2000 10:50 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> Sure Ray:
>
> Here's what I got:
>
> red-red1 0
>
> yel-org 0
> yel-red 59
> yel-red1 0
> yel-blk 120
> yel-brn 0
>
> org-brn 116
> org-red 0
> org-red1 57
> org-brn 116
> org-blk 0
>
> brn-red 0
> brn-red1 59
> brn-blk 0
>
> blk-red1 0
> blk-red 60
>
> Hope I got them all. I arbitrarily called one of the two identical red
wires
> red1.
>
> The label on this Airpax stepper linear actuator has these numbers A92218,
> 8232
>
> Hope to hear about your luck with these linear actuators.
>
> Mark
>
>
Original Message
> From: rjmca <rjmca@w...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Date: Friday, April 14, 2000 2:53 PM
> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
> >Mark:
> >Your wire colors are different than I thought. Could you give me a list
of
> >all the wire colors and resistance readings between them? I am
interested
> >in your project because I am considering buying one of those steppers.
> >
> >Thanks,
> >Ray McArthur
> >
> >
Original Message
> >From: techno_masai <plunkettm@e...>
> >To: <basicstamps@egroups.com>
> >Sent: Friday, April 14, 2000 5:21 PM
> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >
> >
> >> Hi Ray:
> >>
> >> Thanks for looking over my code and hook up, seems like I went thru
every
> >> permutation on the wiring from the UDN to the AirPax, but will check
what
> >> you suggested.
> >>
> >> On the Airpax from Jameco, both the positive wires are red, I connected
> >them
> >> together to 12v. I ran a zener 2EZ15D5MSCT from the same 12v with the
> >zigzag
> >> end pointing to the UDN and ran it to pins 2 and 7.
> >>
> >> Am planning on using the look up table once I get the Airpax up and
> >running
> >> decently.
> >>
> >> The resistance between the brn & org is 115 ohms, between the brn & red
> >its
> >> 59 ohms, between the brn & the other red(no green wire on this Airpax
> >unit)
> >> is 0.
> >>
> >> Per Al Williams book I though I had it figured out.
> >>
> >> Mark
> >>
> >>
Original Message
> >> From: rjmca <rjmca@w...>
> >> To: basicstamps@egroups.com <basicstamps@egroups.com>
> >> Date: Thursday, April 13, 2000 2:23 PM
> >> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >>
> >>
> >> >Mark:
> >> >
> >> >I just looked at your code and may have found a problem. Assuming
your
> >> >motor color codes follow the Airpax codes shown on page 101 of the
V1.9
> >> >manual, and the wires are connected as you say in your code comments,
> the
> >> >coil phases are incorrect. They should be:
> >> >
> >> >red & green to positive
> >> >yellow to UDN pin 1
> >> >orange to pin 3
> >> >brown to pin 8
> >> >black to pin 6
> >> >
> >> >The code looks OK, except you will get a "glitch" when backing up.
You
> >can
> >> >greatly abbreviate the code you are using by using LOOKUP as in the
> stamp
> >> >manual, page 43.
> >> >
> >> >Good luck,
> >> >Ray McArthur
> >> >
> >> >
Original Message
> >> >From: rjmca <rjmca@w...>
> >> >To: <basicstamps@egroups.com>
> >> >Sent: Thursday, April 13, 2000 12:28 AM
> >> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >> >
> >> >
> >> >> Mark:
> >> >>
> >> >> The behavior you describe is bizarre. Normally, skipped steps occur
> at
> >> >> too-high rates. Could you have the coils connected wrong, or an
> >> incorrect
> >> >> step? When my code had errors, the motor was quite erratic. I'll
> >check
> >> >> your code when we have a chance.
> >> >>
> >> >> I just looked at the Jameco catalog... they don't give coil
> >resistance.
> >> >> Did you measure it? The steppers I messed with are rotary units,
but
> >> >yours
> >> >> simply looks like a rotary stepper with a leadscrew attached, so I
> >would
> >> >> expect it to be similar in operation. The Airpax products I have
seen
> >> >were
> >> >> decent quality.
> >> >>
> >> >> Ray
> >> >>
> >> >>
Original Message
> >> >> From: techno_masai <plunkettm@e...>
> >> >> To: <basicstamps@egroups.com>
> >> >> Sent: Wednesday, April 12, 2000 11:08 PM
> >> >> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >> >>
> >> >>
> >> >> > Hi Ray:
> >> >> >
> >> >> > Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I
> >don't
> >> >> know
> >> >> > how to interpret a scope reading on a stepper,(more the willing to
> >read
> >> >> > anything you might comment on here) but with the delay set to 2 I
> get
> >> >the
> >> >> > best performance i.e. seems to get most force, but it skips steps,
> at
> >> >> other
> >> >> > delays, say just like 4 or so, or even 30, 35 it skips a lotta
steps
> >> and
> >> >> > auto reverses at the slightest actuation force, like if I touch
the
> >> >> > actuator, it will back right up.
> >> >> > Anyway this thing runs great with the delay set to 2 but I need
more
> >> >> > reliability, no skipped steps.
> >> >> >
> >> >> > I will look into the Slo Syn stepper.
> >> >> >
> >> >> > Also, I had a 15v zener on it, just like the Allegro spec sheet
for
> >the
> >> >> > UND2544B.
> >> >> >
> >> >> > Thanks, no matter how late, I'm just glad I got your post, there
> been
> >a
> >> >> > pretty big increase in the number of post recently, though they're
> >all
> >> >> > pretty interesting.
> >> >> >
> >> >> > Mark
> >> >> >
> >> >> >
Original Message
> >> >> > From: rjmca <rjmca@w...>
> >> >> > To: basicstamps@egroups.com <basicstamps@egroups.com>
> >> >> > Date: Tuesday, April 11, 2000 6:34 PM
> >> >> > Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >> >> >
> >> >> >
> >> >> > >Pardon the delayed response, but I just noticed that you have
> >delay=2
> >> >in
> >> >> > >your code. I have used a Slo-Syn stepper and a geared stepper
from
> >> >> Airpax.
> >> >> > >Mine will not even run with a delay of only 2 ms. In both cases,
> >> >torque
> >> >> > >falls off below ~25 ms. If you look with a scope, you can see
that
> >> >coil
> >> >> > >current doesn't have time to decay, (because of inductance), at
too
> >> >high
> >> >> a
> >> >> > >stepping rate. In addition, mechanical inertia also eats up
torque
> >at
> >> >> high
> >> >> > >rates. The max rate depends on the particular stepper, but I
will
> >bet
> >> >> that
> >> >> > >2 ms is way too fast for your motor. The rate can be boosted
> >somewhat
> >> >by
> >> >> a
> >> >> > >zener in your clamp circuit.
> >> >> > >
> >> >> > >Better late than never?
> >> >> > >Ray McArthur
> >> >> > >
> >> >> > >
Original Message
> >> >> > >From: techno_masai <plunkettm@e...>
> >> >> > >To: <basicstamps@egroups.com>
> >> >> > >Sent: Saturday, April 01, 2000 10:26 PM
> >> >> > >Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >> >> > >
> >> >> > >
> >> >> > >> Hi all:
> >> >> > >>
> >> >> > >> If anyone has worked with these Airpax stepper motor linear
> >> actuators
> >> >> > give
> >> >> > >> me a holler please.
> >> >> > >> They don't seem to have any significant actuation force. Is the
> >low
> >> >$9
> >> >> > >buck
> >> >> > >> price a tip off? Guess I answered my own question, but any feed
> >back
> >> >on
> >> >> > >this
> >> >> > >> is welcome. So if you pay big bucks the thing is going to have
1
> >LBF
> >> >or
> >> >> > >so?
> >> >> > >>
> >> >> > >> Here's my code if anyone is interested:
> >> >> > >> '
> >> >> > >> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218
> >(JAMECO
> >> >P/N
> >> >> > >> 162587)
> >> >> > >> '3/31/00 TECHNO_MASAI-M.PLUNKETT
> >> >> > >> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
> >> >> > >> 'TWO WIRE CONTROL OF STEPPER,
> >> >> > >> 'STEPPER WIRE DIAGRAM TO '2544B
> >> >> > >> 'ORG PIN 8
> >> >> > >> 'BLK PIN 6
> >> >> > >> 'BRN PIN 3
> >> >> > >> 'YEL PIN 1
> >> >> > >> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET,
IT
> >> >WON'T
> >> >> > >PRINT
> >> >> > >> OUT UNLESS YOU '"PRINT AS IMAGE".
> >> >> > >>
> >> >> > >> DIRS = %0000000000000111
> >> >> > >>
> >> >> > >> CTR VAR WORD
> >> >> > >> DELAY VAR WORD
> >> >> > >> STEPS VAR WORD
> >> >> > >>
> >> >> > >> COIL1_2 CON 0
> >> >> > >> COIL3_4 CON 1
> >> >> > >>
> >> >> > >> DELAY = 2
> >> >> > >> STEPS = 50
> >> >> > >>
> >> >> > >> 'Retract
> >> >> > >>
> >> >> > >> FOR CTR = 1 TO STEPS
> >> >> > >>
> >> >> > >> LOW COIL1_2
> >> >> > >> HIGH COIL3_4
> >> >> > >> PAUSE DELAY
> >> >> > >>
> >> >> > >> LOW COIL1_2
> >> >> > >> LOW COIL3_4
> >> >> > >> PAUSE DELAY
> >> >> > >>
> >> >> > >> HIGH COIL1_2
> >> >> > >> LOW COIL3_4
> >> >> > >> PAUSE DELAY
> >> >> > >>
> >> >> > >> HIGH COIL1_2
> >> >> > >> HIGH COIL3_4
> >> >> > >> PAUSE DELAY
> >> >> > >>
> >> >> > >> NEXT
> >> >> > >>
> >> >> > >> 'EXTEND
> >> >> > >>
> >> >> > >> FOR CTR = 1 TO STEPS
> >> >> > >>
> >> >> > >> HIGH COIL1_2
> >> >> > >> HIGH COIL3_4
> >> >> > >> PAUSE DELAY
> >> >> > >>
> >> >> > >> HIGH COIL1_2
> >> >> > >> LOW COIL3_4
> >> >> > >> PAUSE DELAY
> >> >> > >>
> >> >> > >> LOW COIL1_2
> >> >> > >> LOW COIL3_4
> >> >> > >> PAUSE DELAY
> >> >> > >>
> >> >> > >> LOW COIL1_2
> >> >> > >> HIGH COIL3_4
> >> >> > >> PAUSE DELAY
> >> >> > >>
> >> >> > >> NEXT
> >> >> > >>
> >> >> > >> END
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
>
>
>
>
>Mark:
>The UDN 2544 should drive a unipolar stepper if connected as their example
>circuit that you are using. If one of your stamp pins drives UDN pins 9&10,
>and the other stamp pin drives UDN pins 15&16, there should be no problem.
>.
>I have an EDE1200 driving a stepper, and it works fine, but so should your
>UDN.
>
>Will check out the Airpax site Bruce mentioned, but I think I already have
>it downloaded.
Just as a matter of clarification, my comments were relative to the Jameco
Airpax actuator unit, and ONLY if it's the same unit as pictured on the
Thomson Mechatronics website.
Bruce
>
>Thanks,
>Ray McArthur
>
>
>
Original Message
>From: techno_masai <plunkettm@e...>
>To: <basicstamps@egroups.com>
>Sent: Friday, April 14, 2000 5:45 PM
>Subject: Re: [noparse][[/noparse]basicstamps] [noparse][[/noparse]long] 2 pin BSC2 to stepper
>
>
>> Hi Bruce:
>>
>> Thanks for the detailed post, all very interesting and great stuff.
>>
>> I guess what threw me off on the UDN2544 was that on the Allegro spec
>sheet
>> front page under Features it says "Inputs configured for Unipolar Stepper
>> Motors", so I guess you can drive a bipolar stepper with unipolar inputs?
>>
>> Will check out the links you posted, especially on the EDE-1200 Uni-Polar
>> Stepper ASIC
>>
>> I look forward to checking out their EDE-1200 App Note regarding (Airpax)
>> Linear Actuators big time.
>>
>> Have you worked at all with digital encoders from US Digital, that will be
>> probably the next thing I'll be tackling once I get the Airpax up and
>> running.
>>
>> Mark
>>
>>
Original Message
>> From: Bruce Bates <bvbates@u...>
>> To: basicstamps@egroups.com <basicstamps@egroups.com>
>> Cc: Todd Peterson <toddp@e...>
>> Date: Thursday, April 13, 2000 9:49 AM
>> Subject: Re: [noparse][[/noparse]basicstamps] [noparse][[/noparse]long] 2 pin BSC2 to stepper
>>
>>
>> >At 08:08 PM 4/12/00 -0700, techno_masai promulgated:
>> >
>> > [noparse][[/noparse]Apologies to all for the length of this post, but I felt the
>> > information important to many Stampers - due to the fairly
>> > recent availability of linear actuators in the surplus catalogs,
>> > here in the US]
>> >
>> >Mark and Ray:
>> >
>> >Sorry for my "delayed" response as well. Either my ISP or the eGroups
>mail
>> >monster ate my earlier reply to this 'thread' <sigh>.
>> >
>> >You might take a look at this reference Mark and confirm a recollection I
>> >have -
>> >[noparse][[/noparse] http://www.thomsonmotors.com/airpax/airpax.htm ] in the center picture
>> >labelled
>> >
>> > " Value Added Products - "
>> > " Geared Motors and Digital "
>> > " Linear Actuators "
>> >
>> >and take a look at the linear actuator at the bottom of the picture -
>> >center of
>> >the frame. If that is what the Jameco (Airpax) linear actuator looks
>like,
>> >you
>> >may want to continue with that lead and this note. If so,
>> >
>> >The Thomson Industries (Airpax) series numbers are:
>> >
>> > K92100 and L92100 and are called "Digital Linear Actuators"
>> >
>> >Although there is no document number on the literature I personally have
>> >before me, the title/ref is:
>> >
>> >"Product Selection and Engineering Guide", Thomson (Airpax Mechatronics),
>> >Thomson Industries, 7 McKee Place, Port Washington, NY, 11050, USA;
>> >1-203-271-6400; www.thomsonmotors.com
>> >
>> >and
>> > WWW: www.thomsonindustries.com (US HQ Corporate Site)
>> >
>> > E-Mail: litrequest@t... US Toll-Free 1-800-554-8466
>> > Literature Req. No. 12-01-000-6001 US Fax 1-800-445-0329
>> > or 1-516-883-9039 Int'l
>> >
>> > Other E-Mail: GB/Europe info@t... ASIA airpax@t...
>> >
>> >It can be obtained by download from that same website noted above
>> >[noparse][[/noparse] www.thomsonmotors.com/airpax ] in the Catalog Section, or apparently by
>> >requesting Literature No. 12-01-000-6001 by e-mail (see refs above);
>> >various torque curves are shown there as well.
>> >
>> >Personally, I think this piece of literature is a (device specific) "must
>> >have",
>> >and I obtained mine by Snail Mail - some time ago. Whether it can be
>> >ordered like
>> >that today, I don't know for sure. An inquiry at the website might
>> >determine that.
>> >
>> >The reason I view it as a "must have" is from the pov that there is very
>> >little
>> >in the way of documentation on linear actuators (in general), and it has
>> >been my experience that most of the units available (new, surplus,
>> >liquidated, etc) seem
>> >to be (at least similar) to those listed in this Thomson (Airpax)
>catalog.
>> >
>> >There is a more important reason yet - if one looks closely at the
>> >documentation (I can't speak for the download, although I would hope it
>> >would concur), one comes to realization that these must be driven as
>> >UNI-POLAR steppers would be driven. This
>> >ties us back to the original question <whew !>.
>> >
>> >The Allegro Chip mentioned is for BI-POLAR Steppers. At this juncture the
>> >best recommendation I could make, would be to hold on to the Allegro chip
>> >for some
>> >future adventure with BI-POLAR steppers, and wander over the the E-Lab
>> site:
>> >[noparse][[/noparse] www.elab.com ] and take a look at their EDE-1200 Uni-Polar Stepper ASIC
>> >Chip.
>> >
>> >Why ?
>> >
>> >In truth any UNI-POLAR stepper drive chip might do, from scads of
>> >manufacturers.
>> >It would be my guess that some additional torque insight might be
>required,
>> >however, and the quickest route I know to FIRST-HAND information is via
>> >E-Labs and the Prez. there, Todd Peterson [noparse][[/noparse]EMAIL: "Todd Peterson"
>> ><toddp@e...> ] who is kind
>> >enough to monitor this list.
>> >
>> >Perhaps Elabs might take this on as a small documentation side-project
>> >(hint, hint),
>> >at some future date. There is additional information I would be happy to
>> >offer for reference. An Elabs EDE-1200 App Note regarding (Airpax) Linear
>> >Actuators, relative
>> >to microprocessors in general, and the Stamp family in specific would be
>> >MOST welcome by all, I'm sure (least *I* would love to have one <smile>).
>> >
>> >The additional specific topic(s) of "torque" + "UN-POLAR" + "EDE-1200"
>(or
>> >other
>> >chips) might be a topic for a brief E.E. "White Paper" (as are becoming
>so
>> >popular today on niche subjects <weird !>). YMMV on that one.
>> >
>> >The tenative and general conclusions I have reached from what I've read,
>> and
>> >what I've learned thru experimetation - are:
>> >
>> >FULL, HALF, and MICRO-STEPPING methods are available from UNI-POLAR drive
>> >chips,
>> >and torque curves will vary accordingly. More than that, gearing may be
>> >required, depending on the application. Actuators aren't generally
>> >appropriate for use in
>> >stepper motor applications, but stepper motors (to an extent) might be
>used
>> >like
>> >a linear actuator (Acme/ball screw drive and helix shaft). Individual
>> >applications
>> >may vary from that general premise.
>> >
>> >Generally SLO SYN (type and brand) motors are expensive (even surplus)
>but
>> >sometimes they are quite necessary; again, depending on the application.
>> >
>> >If the Airpax unit is the one I suspect it is - it is intended for LIGHT
>> >DUTY application ONLY. Low cost, light loads and like factors are
>> >consistant with these Airpax (surplus) units.
>> >
>> >Hope that helps.
>> >
>> >Regards,
>> >
>> >Bruce
>> >
>> >
>> >>Hi Ray:
>> >>
>> >>Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I don't
>> know
>> >>how to interpret a scope reading on a stepper,(more the willing to read
>> >>anything you might comment on here) but with the delay set to 2 I get
>the
>> >>best performance i.e. seems to get most force, but it skips steps, at
>> other
>> >>delays, say just like 4 or so, or even 30, 35 it skips a lotta steps and
>> >>auto reverses at the slightest actuation force, like if I touch the
>> >>actuator, it will back right up.
>> >>Anyway this thing runs great with the delay set to 2 but I need more
>> >>reliability, no skipped steps.
>> >>
>> >>I will look into the Slo Syn stepper.
>> >>
>> >>Also, I had a 15v zener on it, just like the Allegro spec sheet for the
>> >>UND2544B.
>> >>
>> >>Thanks, no matter how late, I'm just glad I got your post, there been a
>> >>pretty big increase in the number of post recently, though they're all
>> >>pretty interesting.
>> >>
>> >>Mark
>> >>
>> >>
Original Message
>> >>From: rjmca <rjmca@w...>
>> >>To: basicstamps@egroups.com <basicstamps@egroups.com>
>> >>Date: Tuesday, April 11, 2000 6:34 PM
>> >>Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >>
>> >>
>> >>>Pardon the delayed response, but I just noticed that you have delay=2
>in
>> >>>your code. I have used a Slo-Syn stepper and a geared stepper from
>> Airpax.
>> >>>Mine will not even run with a delay of only 2 ms. In both cases,
>torque
>> >>>falls off below ~25 ms. If you look with a scope, you can see that
>coil
>> >>>current doesn't have time to decay, (because of inductance), at too
>high
>> a
>> >>>stepping rate. In addition, mechanical inertia also eats up torque at
>> high
>> >>>rates. The max rate depends on the particular stepper, but I will bet
>> that
>> >>>2 ms is way too fast for your motor. The rate can be boosted somewhat
>by
>> a
>> >>>zener in your clamp circuit.
>> >>>
>> >>>Better late than never?
>> >>>Ray McArthur
>> >>>
>> >>>
Original Message
>> >>>From: techno_masai <plunkettm@e...>
>> >>>To: <basicstamps@egroups.com>
>> >>>Sent: Saturday, April 01, 2000 10:26 PM
>> >>>Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >>>
>> >>>
>> >>>> Hi all:
>> >>>>
>> >>>> If anyone has worked with these Airpax stepper motor linear actuators
>> >>give
>> >>>> me a holler please.
>> >>>> They don't seem to have any significant actuation force. Is the low
>$9
>> >>>buck
>> >>>> price a tip off? Guess I answered my own question, but any feed back
>on
>> >>>this
>> >>>> is welcome. So if you pay big bucks the thing is going to have 1 LBF
>or
>> >>>so?
>> >>>>
>> >>>> Here's my code if anyone is interested:
>> >>>> '
>> >>>> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218 (JAMECO
>P/N
>> >>>> 162587)
>> >>>> '3/31/00 TECHNO_MASAI-M.PLUNKETT
>> >>>> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
>> >>>> 'TWO WIRE CONTROL OF STEPPER,
>> >>>> 'STEPPER WIRE DIAGRAM TO '2544B
>> >>>> 'ORG PIN 8
>> >>>> 'BLK PIN 6
>> >>>> 'BRN PIN 3
>> >>>> 'YEL PIN 1
>> >>>> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET, IT
>WON'T
>> >>>PRINT
>> >>>> OUT UNLESS YOU '"PRINT AS IMAGE".
>> >>>>
>> >>>> DIRS = %0000000000000111
>> >>>>
>> >>>> CTR VAR WORD
>> >>>> DELAY VAR WORD
>> >>>> STEPS VAR WORD
>> >>>>
>> >>>> COIL1_2 CON 0
>> >>>> COIL3_4 CON 1
>> >>>>
>> >>>> DELAY = 2
>> >>>> STEPS = 50
>> >>>>
>> >>>> 'Retract
>> >>>>
>> >>>> FOR CTR = 1 TO STEPS
>> >>>>
>> >>>> LOW COIL1_2
>> >>>> HIGH COIL3_4
>> >>>> PAUSE DELAY
>> >>>>
>> >>>> LOW COIL1_2
>> >>>> LOW COIL3_4
>> >>>> PAUSE DELAY
>> >>>>
>> >>>> HIGH COIL1_2
>> >>>> LOW COIL3_4
>> >>>> PAUSE DELAY
>> >>>>
>> >>>> HIGH COIL1_2
>> >>>> HIGH COIL3_4
>> >>>> PAUSE DELAY
>> >>>>
>> >>>> NEXT
>> >>>>
>> >>>> 'EXTEND
>> >>>>
>> >>>> FOR CTR = 1 TO STEPS
>> >>>>
>> >>>> HIGH COIL1_2
>> >>>> HIGH COIL3_4
>> >>>> PAUSE DELAY
>> >>>>
>> >>>> HIGH COIL1_2
>> >>>> LOW COIL3_4
>> >>>> PAUSE DELAY
>> >>>>
>> >>>> LOW COIL1_2
>> >>>> LOW COIL3_4
>> >>>> PAUSE DELAY
>> >>>>
>> >>>> LOW COIL1_2
>> >>>> HIGH COIL3_4
>> >>>> PAUSE DELAY
>> >>>>
>> >>>> NEXT
>> >>>>
>> >>>> END
>> >>>>
>> >>>>
>> >>>>
>>
>>>>>
>> -
>> >>>>
>> >>>> eGroups.com home: http://www.egroups.com/group/basicstamps
>> >>>> http://www.egroups.com - Simplifying group communications
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> >
>> >
>>
>>
>>
>>
>
>
>
>
>
Wow, that was it, thing runs like a charm now, thank you very much!
Darn and I must have gone thru that combo at least once, I'm not sure how I
missed it.
Funny thing is that it runs really fast and snappy at delay = 2 too, and
like you said runs great at 40.
Dogone this thing is neat now!
Saw your post on the VFD, haven't worked on serial connections to these
either, but there must be a Register Select command to get your characters
into the 2nd 8 characters on the display, as you more than likely know its
like %11000000 on the parallel driven Optrex.
Guess I'm trying to offer up some probably rather pathetic help here since
I'm pretty indebted to your assistance Ray.
Thanks again,
Mark
Original Message
From: rjmca <rjmca@w...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Friday, April 14, 2000 8:33 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>Mark:
>Thanks for the info. From your readings, you should try:
>* both reds to plus, like you have.
>* brown to UDN pin 3.
>* orange to pin 1.
>* yellow to pin 8.
>* black to pin 6.
>
>Don' forget to try longer delays, like 40 if it's weird.
>
>Let me know how you make out,
>Ray McArthur
>
>
Original Message
>From: techno_masai <plunkettm@e...>
>To: <basicstamps@egroups.com>
>Sent: Friday, April 14, 2000 10:50 PM
>Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
>> Sure Ray:
>>
>> Here's what I got:
>>
>> red-red1 0
>>
>> yel-org 0
>> yel-red 59
>> yel-red1 0
>> yel-blk 120
>> yel-brn 0
>>
>> org-brn 116
>> org-red 0
>> org-red1 57
>> org-brn 116
>> org-blk 0
>>
>> brn-red 0
>> brn-red1 59
>> brn-blk 0
>>
>> blk-red1 0
>> blk-red 60
>>
>> Hope I got them all. I arbitrarily called one of the two identical red
>wires
>> red1.
>>
>> The label on this Airpax stepper linear actuator has these numbers
A92218,
>> 8232
>>
>> Hope to hear about your luck with these linear actuators.
>>
>> Mark
>>
>>
Original Message
>> From: rjmca <rjmca@w...>
>> To: basicstamps@egroups.com <basicstamps@egroups.com>
>> Date: Friday, April 14, 2000 2:53 PM
>> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>>
>>
>> >Mark:
>> >Your wire colors are different than I thought. Could you give me a list
>of
>> >all the wire colors and resistance readings between them? I am
>interested
>> >in your project because I am considering buying one of those steppers.
>> >
>> >Thanks,
>> >Ray McArthur
>> >
>> >
Original Message
>> >From: techno_masai <plunkettm@e...>
>> >To: <basicstamps@egroups.com>
>> >Sent: Friday, April 14, 2000 5:21 PM
>> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >
>> >
>> >> Hi Ray:
>> >>
>> >> Thanks for looking over my code and hook up, seems like I went thru
>every
>> >> permutation on the wiring from the UDN to the AirPax, but will check
>what
>> >> you suggested.
>> >>
>> >> On the Airpax from Jameco, both the positive wires are red, I
connected
>> >them
>> >> together to 12v. I ran a zener 2EZ15D5MSCT from the same 12v with the
>> >zigzag
>> >> end pointing to the UDN and ran it to pins 2 and 7.
>> >>
>> >> Am planning on using the look up table once I get the Airpax up and
>> >running
>> >> decently.
>> >>
>> >> The resistance between the brn & org is 115 ohms, between the brn &
red
>> >its
>> >> 59 ohms, between the brn & the other red(no green wire on this Airpax
>> >unit)
>> >> is 0.
>> >>
>> >> Per Al Williams book I though I had it figured out.
>> >>
>> >> Mark
>> >>
>> >>
Original Message
>> >> From: rjmca <rjmca@w...>
>> >> To: basicstamps@egroups.com <basicstamps@egroups.com>
>> >> Date: Thursday, April 13, 2000 2:23 PM
>> >> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >>
>> >>
>> >> >Mark:
>> >> >
>> >> >I just looked at your code and may have found a problem. Assuming
>your
>> >> >motor color codes follow the Airpax codes shown on page 101 of the
>V1.9
>> >> >manual, and the wires are connected as you say in your code comments,
>> the
>> >> >coil phases are incorrect. They should be:
>> >> >
>> >> >red & green to positive
>> >> >yellow to UDN pin 1
>> >> >orange to pin 3
>> >> >brown to pin 8
>> >> >black to pin 6
>> >> >
>> >> >The code looks OK, except you will get a "glitch" when backing up.
>You
>> >can
>> >> >greatly abbreviate the code you are using by using LOOKUP as in the
>> stamp
>> >> >manual, page 43.
>> >> >
>> >> >Good luck,
>> >> >Ray McArthur
>> >> >
>> >> >
Original Message
>> >> >From: rjmca <rjmca@w...>
>> >> >To: <basicstamps@egroups.com>
>> >> >Sent: Thursday, April 13, 2000 12:28 AM
>> >> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >> >
>> >> >
>> >> >> Mark:
>> >> >>
>> >> >> The behavior you describe is bizarre. Normally, skipped steps
occur
>> at
>> >> >> too-high rates. Could you have the coils connected wrong, or an
>> >> incorrect
>> >> >> step? When my code had errors, the motor was quite erratic. I'll
>> >check
>> >> >> your code when we have a chance.
>> >> >>
>> >> >> I just looked at the Jameco catalog... they don't give coil
>> >resistance.
>> >> >> Did you measure it? The steppers I messed with are rotary units,
>but
>> >> >yours
>> >> >> simply looks like a rotary stepper with a leadscrew attached, so I
>> >would
>> >> >> expect it to be similar in operation. The Airpax products I have
>seen
>> >> >were
>> >> >> decent quality.
>> >> >>
>> >> >> Ray
>> >> >>
>> >> >>
Original Message
>> >> >> From: techno_masai <plunkettm@e...>
>> >> >> To: <basicstamps@egroups.com>
>> >> >> Sent: Wednesday, April 12, 2000 11:08 PM
>> >> >> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >> >>
>> >> >>
>> >> >> > Hi Ray:
>> >> >> >
>> >> >> > Guess I haven't hooked up my ol'1202A HP o-scope to it, frankly I
>> >don't
>> >> >> know
>> >> >> > how to interpret a scope reading on a stepper,(more the willing
to
>> >read
>> >> >> > anything you might comment on here) but with the delay set to 2 I
>> get
>> >> >the
>> >> >> > best performance i.e. seems to get most force, but it skips
steps,
>> at
>> >> >> other
>> >> >> > delays, say just like 4 or so, or even 30, 35 it skips a lotta
>steps
>> >> and
>> >> >> > auto reverses at the slightest actuation force, like if I touch
>the
>> >> >> > actuator, it will back right up.
>> >> >> > Anyway this thing runs great with the delay set to 2 but I need
>more
>> >> >> > reliability, no skipped steps.
>> >> >> >
>> >> >> > I will look into the Slo Syn stepper.
>> >> >> >
>> >> >> > Also, I had a 15v zener on it, just like the Allegro spec sheet
>for
>> >the
>> >> >> > UND2544B.
>> >> >> >
>> >> >> > Thanks, no matter how late, I'm just glad I got your post, there
>> been
>> >a
>> >> >> > pretty big increase in the number of post recently, though
they're
>> >all
>> >> >> > pretty interesting.
>> >> >> >
>> >> >> > Mark
>> >> >> >
>> >> >> >
Original Message
>> >> >> > From: rjmca <rjmca@w...>
>> >> >> > To: basicstamps@egroups.com <basicstamps@egroups.com>
>> >> >> > Date: Tuesday, April 11, 2000 6:34 PM
>> >> >> > Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >> >> >
>> >> >> >
>> >> >> > >Pardon the delayed response, but I just noticed that you have
>> >delay=2
>> >> >in
>> >> >> > >your code. I have used a Slo-Syn stepper and a geared stepper
>from
>> >> >> Airpax.
>> >> >> > >Mine will not even run with a delay of only 2 ms. In both
cases,
>> >> >torque
>> >> >> > >falls off below ~25 ms. If you look with a scope, you can see
>that
>> >> >coil
>> >> >> > >current doesn't have time to decay, (because of inductance), at
>too
>> >> >high
>> >> >> a
>> >> >> > >stepping rate. In addition, mechanical inertia also eats up
>torque
>> >at
>> >> >> high
>> >> >> > >rates. The max rate depends on the particular stepper, but I
>will
>> >bet
>> >> >> that
>> >> >> > >2 ms is way too fast for your motor. The rate can be boosted
>> >somewhat
>> >> >by
>> >> >> a
>> >> >> > >zener in your clamp circuit.
>> >> >> > >
>> >> >> > >Better late than never?
>> >> >> > >Ray McArthur
>> >> >> > >
>> >> >> > >
Original Message
>> >> >> > >From: techno_masai <plunkettm@e...>
>> >> >> > >To: <basicstamps@egroups.com>
>> >> >> > >Sent: Saturday, April 01, 2000 10:26 PM
>> >> >> > >Subject: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >> >> > >
>> >> >> > >
>> >> >> > >> Hi all:
>> >> >> > >>
>> >> >> > >> If anyone has worked with these Airpax stepper motor linear
>> >> actuators
>> >> >> > give
>> >> >> > >> me a holler please.
>> >> >> > >> They don't seem to have any significant actuation force. Is
the
>> >low
>> >> >$9
>> >> >> > >buck
>> >> >> > >> price a tip off? Guess I answered my own question, but any
feed
>> >back
>> >> >on
>> >> >> > >this
>> >> >> > >> is welcome. So if you pay big bucks the thing is going to have
>1
>> >LBF
>> >> >or
>> >> >> > >so?
>> >> >> > >>
>> >> >> > >> Here's my code if anyone is interested:
>> >> >> > >> '
>> >> >> > >> 'ALLEGRO UND2544B TO AIRPAX STEPPER LINEAR 'ACTUATOR A92218
>> >(JAMECO
>> >> >P/N
>> >> >> > >> 162587)
>> >> >> > >> '3/31/00 TECHNO_MASAI-M.PLUNKETT
>> >> >> > >> 'ADAPTED FROM ALLEGRO UND2544B SPEC SHEET.
>> >> >> > >> 'TWO WIRE CONTROL OF STEPPER,
>> >> >> > >> 'STEPPER WIRE DIAGRAM TO '2544B
>> >> >> > >> 'ORG PIN 8
>> >> >> > >> 'BLK PIN 6
>> >> >> > >> 'BRN PIN 3
>> >> >> > >> 'YEL PIN 1
>> >> >> > >> 'SEE ALLEGRO DWG# EP-015 FOR ZENER, ETC ON P3 'OF SPEC SHEET,
>IT
>> >> >WON'T
>> >> >> > >PRINT
>> >> >> > >> OUT UNLESS YOU '"PRINT AS IMAGE".
>> >> >> > >>
>> >> >> > >> DIRS = %0000000000000111
>> >> >> > >>
>> >> >> > >> CTR VAR WORD
>> >> >> > >> DELAY VAR WORD
>> >> >> > >> STEPS VAR WORD
>> >> >> > >>
>> >> >> > >> COIL1_2 CON 0
>> >> >> > >> COIL3_4 CON 1
>> >> >> > >>
>> >> >> > >> DELAY = 2
>> >> >> > >> STEPS = 50
>> >> >> > >>
>> >> >> > >> 'Retract
>> >> >> > >>
>> >> >> > >> FOR CTR = 1 TO STEPS
>> >> >> > >>
>> >> >> > >> LOW COIL1_2
>> >> >> > >> HIGH COIL3_4
>> >> >> > >> PAUSE DELAY
>> >> >> > >>
>> >> >> > >> LOW COIL1_2
>> >> >> > >> LOW COIL3_4
>> >> >> > >> PAUSE DELAY
>> >> >> > >>
>> >> >> > >> HIGH COIL1_2
>> >> >> > >> LOW COIL3_4
>> >> >> > >> PAUSE DELAY
>> >> >> > >>
>> >> >> > >> HIGH COIL1_2
>> >> >> > >> HIGH COIL3_4
>> >> >> > >> PAUSE DELAY
>> >> >> > >>
>> >> >> > >> NEXT
>> >> >> > >>
>> >> >> > >> 'EXTEND
>> >> >> > >>
>> >> >> > >> FOR CTR = 1 TO STEPS
>> >> >> > >>
>> >> >> > >> HIGH COIL1_2
>> >> >> > >> HIGH COIL3_4
>> >> >> > >> PAUSE DELAY
>> >> >> > >>
>> >> >> > >> HIGH COIL1_2
>> >> >> > >> LOW COIL3_4
>> >> >> > >> PAUSE DELAY
>> >> >> > >>
>> >> >> > >> LOW COIL1_2
>> >> >> > >> LOW COIL3_4
>> >> >> > >> PAUSE DELAY
>> >> >> > >>
>> >> >> > >> LOW COIL1_2
>> >> >> > >> HIGH COIL3_4
>> >> >> > >> PAUSE DELAY
>> >> >> > >>
>> >> >> > >> NEXT
>> >> >> > >>
>> >> >> > >> END
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> >
>> >
>> >
>>
>>
>>
>>
>
>
>
>
>
Glad to hear it's working. How much thrust force does it have? Probably
more thrust at low speeds. My display is working now using commands
outlined in Scott Edwards docs, but I still have questions to post.
Regards,
Ray McArthur
Original Message
From: techno_masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Saturday, April 15, 2000 1:59 AM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> Ray:
>
> Wow, that was it, thing runs like a charm now, thank you very much!
> Darn and I must have gone thru that combo at least once, I'm not sure how
I
> missed it.
>
> Funny thing is that it runs really fast and snappy at delay = 2 too, and
> like you said runs great at 40.
>
> Dogone this thing is neat now!
>
> Saw your post on the VFD, haven't worked on serial connections to these
> either, but there must be a Register Select command to get your characters
> into the 2nd 8 characters on the display, as you more than likely know its
> like %11000000 on the parallel driven Optrex.
>
> Guess I'm trying to offer up some probably rather pathetic help here since
> I'm pretty indebted to your assistance Ray.
>
> Thanks again,
>
> Mark
>
>
>
Original Message
> From: rjmca <rjmca@w...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Date: Friday, April 14, 2000 8:33 PM
> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
> >Mark:
> >Thanks for the info. From your readings, you should try:
> >* both reds to plus, like you have.
> >* brown to UDN pin 3.
> >* orange to pin 1.
> >* yellow to pin 8.
> >* black to pin 6.
> >
> >Don' forget to try longer delays, like 40 if it's weird.
> >
> >Let me know how you make out,
> >Ray McArthur
> >
> >
Original Message
> >From: techno_masai <plunkettm@e...>
> >To: <basicstamps@egroups.com>
> >Sent: Friday, April 14, 2000 10:50 PM
> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >
> >
> >> Sure Ray:
> >>
> >> Here's what I got:
> >>
> >> red-red1 0
> >>
> >> yel-org 0
> >> yel-red 59
> >> yel-red1 0
> >> yel-blk 120
> >> yel-brn 0
> >>
> >> org-brn 116
> >> org-red 0
> >> org-red1 57
> >> org-brn 116
> >> org-blk 0
> >>
> >> brn-red 0
> >> brn-red1 59
> >> brn-blk 0
> >>
> >> blk-red1 0
> >> blk-red 60
> >>
> >> Hope I got them all. I arbitrarily called one of the two identical red
> >wires
> >> red1.
> >>
> >> The label on this Airpax stepper linear actuator has these numbers
> A92218,
> >> 8232
Probably getting a least a couple lbs force, maybe up to around 5, anyway a
lot more force than I thought could be gotten out of this thing.
On hold torque, I'm guessing the weak link would be the UND2544 or would the
coils tend to overheat.
Guess the UND would be OK since its rated for 1.8A continuous, the Airpax is
running 12v/60ohms=200mA so seems like a good enough margin there.
Took apart an old pen plotter I had, the bipolar steppers were very small
but the power IC's and heat sinks were just huge, so I guess they figure a
lot of heat build up, and the only loading is moving the pen around.
Mark
Original Message
From: rjmca <rjmca@w...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Saturday, April 15, 2000 2:28 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>Mark:
>Glad to hear it's working. How much thrust force does it have? Probably
>more thrust at low speeds. My display is working now using commands
>outlined in Scott Edwards docs, but I still have questions to post.
>
>Regards,
>Ray McArthur
>
>
Original Message
>From: techno_masai <plunkettm@e...>
>To: <basicstamps@egroups.com>
>Sent: Saturday, April 15, 2000 1:59 AM
>Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
>> Ray:
>>
>> Wow, that was it, thing runs like a charm now, thank you very much!
>> Darn and I must have gone thru that combo at least once, I'm not sure how
>I
>> missed it.
>>
>> Funny thing is that it runs really fast and snappy at delay = 2 too, and
>> like you said runs great at 40.
>>
>> Dogone this thing is neat now!
>>
>> Saw your post on the VFD, haven't worked on serial connections to these
>> either, but there must be a Register Select command to get your
characters
>> into the 2nd 8 characters on the display, as you more than likely know
its
>> like %11000000 on the parallel driven Optrex.
>>
>> Guess I'm trying to offer up some probably rather pathetic help here
since
>> I'm pretty indebted to your assistance Ray.
>>
>> Thanks again,
>>
>> Mark
>>
>>
>>
Original Message
>> From: rjmca <rjmca@w...>
>> To: basicstamps@egroups.com <basicstamps@egroups.com>
>> Date: Friday, April 14, 2000 8:33 PM
>> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>>
>>
>> >Mark:
>> >Thanks for the info. From your readings, you should try:
>> >* both reds to plus, like you have.
>> >* brown to UDN pin 3.
>> >* orange to pin 1.
>> >* yellow to pin 8.
>> >* black to pin 6.
>> >
>> >Don' forget to try longer delays, like 40 if it's weird.
>> >
>> >Let me know how you make out,
>> >Ray McArthur
>> >
>> >
Original Message
>> >From: techno_masai <plunkettm@e...>
>> >To: <basicstamps@egroups.com>
>> >Sent: Friday, April 14, 2000 10:50 PM
>> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>> >
>> >
>> >> Sure Ray:
>> >>
>> >> Here's what I got:
>> >>
>> >> red-red1 0
>> >>
>> >> yel-org 0
>> >> yel-red 59
>> >> yel-red1 0
>> >> yel-blk 120
>> >> yel-brn 0
>> >>
>> >> org-brn 116
>> >> org-red 0
>> >> org-red1 57
>> >> org-brn 116
>> >> org-blk 0
>> >>
>> >> brn-red 0
>> >> brn-red1 59
>> >> brn-blk 0
>> >>
>> >> blk-red1 0
>> >> blk-red 60
>> >>
>> >> Hope I got them all. I arbitrarily called one of the two identical red
>> >wires
>> >> red1.
>> >>
>> >> The label on this Airpax stepper linear actuator has these numbers
>> A92218,
>> >> 8232
>
>
>
>
>
>
Ray
Original Message
From: techno_masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Saturday, April 15, 2000 11:38 PM
Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> Hi Ray:
>
> Probably getting a least a couple lbs force, maybe up to around 5, anyway
a
> lot more force than I thought could be gotten out of this thing.
>
> On hold torque, I'm guessing the weak link would be the UND2544 or would
the
> coils tend to overheat.
> Guess the UND would be OK since its rated for 1.8A continuous, the Airpax
is
> running 12v/60ohms=200mA so seems like a good enough margin there.
>
> Took apart an old pen plotter I had, the bipolar steppers were very small
> but the power IC's and heat sinks were just huge, so I guess they figure a
> lot of heat build up, and the only loading is moving the pen around.
>
> Mark
>
>
Original Message
> From: rjmca <rjmca@w...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Date: Saturday, April 15, 2000 2:28 PM
> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
>
>
> >Mark:
> >Glad to hear it's working. How much thrust force does it have? Probably
> >more thrust at low speeds. My display is working now using commands
> >outlined in Scott Edwards docs, but I still have questions to post.
> >
> >Regards,
> >Ray McArthur
> >
> >
Original Message
> >From: techno_masai <plunkettm@e...>
> >To: <basicstamps@egroups.com>
> >Sent: Saturday, April 15, 2000 1:59 AM
> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >
> >
> >> Ray:
> >>
> >> Wow, that was it, thing runs like a charm now, thank you very much!
> >> Darn and I must have gone thru that combo at least once, I'm not sure
how
> >I
> >> missed it.
> >>
> >> Funny thing is that it runs really fast and snappy at delay = 2 too,
and
> >> like you said runs great at 40.
> >>
> >> Dogone this thing is neat now!
> >>
> >> Saw your post on the VFD, haven't worked on serial connections to these
> >> either, but there must be a Register Select command to get your
> characters
> >> into the 2nd 8 characters on the display, as you more than likely know
> its
> >> like %11000000 on the parallel driven Optrex.
> >>
> >> Guess I'm trying to offer up some probably rather pathetic help here
> since
> >> I'm pretty indebted to your assistance Ray.
> >>
> >> Thanks again,
> >>
> >> Mark
> >>
> >>
> >>
Original Message
> >> From: rjmca <rjmca@w...>
> >> To: basicstamps@egroups.com <basicstamps@egroups.com>
> >> Date: Friday, April 14, 2000 8:33 PM
> >> Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >>
> >>
> >> >Mark:
> >> >Thanks for the info. From your readings, you should try:
> >> >* both reds to plus, like you have.
> >> >* brown to UDN pin 3.
> >> >* orange to pin 1.
> >> >* yellow to pin 8.
> >> >* black to pin 6.
> >> >
> >> >Don' forget to try longer delays, like 40 if it's weird.
> >> >
> >> >Let me know how you make out,
> >> >Ray McArthur
> >> >
> >> >
Original Message
> >> >From: techno_masai <plunkettm@e...>
> >> >To: <basicstamps@egroups.com>
> >> >Sent: Friday, April 14, 2000 10:50 PM
> >> >Subject: Re: [noparse][[/noparse]basicstamps] 2 pin BSC2 to stepper
> >> >
> >> >
> >> >> Sure Ray:
> >> >>
> >> >> Here's what I got:
> >> >>
> >> >> red-red1 0
> >> >>
> >> >> yel-org 0
> >> >> yel-red 59
> >> >> yel-red1 0
> >> >> yel-blk 120
> >> >> yel-brn 0
> >> >>
> >> >> org-brn 116
> >> >> org-red 0
> >> >> org-red1 57
> >> >> org-brn 116
> >> >> org-blk 0
> >> >>
> >> >> brn-red 0
> >> >> brn-red1 59
> >> >> brn-blk 0
> >> >>
> >> >> blk-red1 0
> >> >> blk-red 60
> >> >>
> >> >> Hope I got them all. I arbitrarily called one of the two identical
red
> >> >wires
> >> >> red1.
> >> >>
> >> >> The label on this Airpax stepper linear actuator has these numbers
> >> A92218,
> >> >> 8232
> >
> >
> >
> >
> >
> >
>
>
>
>