Stepper Question
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Posts: 46,084
I am trying to make a CNC mill (Small one) Using the basic stamp. I
am trying to use two stepper motors. I got a good program (i think).
But I need help with what tipe of all thread (a long bolt without a
head) I need. The steppers that I am using has a 1.8deg per step. And
I want the table to move .001" per step. Please help.
am trying to use two stepper motors. I got a good program (i think).
But I need help with what tipe of all thread (a long bolt without a
head) I need. The steppers that I am using has a 1.8deg per step. And
I want the table to move .001" per step. Please help.
Comments
lets see...
360 degrees / 1.8 degrees per step = 200 steps per rotation.
This means you want one rotation to go 200 thousandths of an inch, or
1/5th of an inch. So, using a shaft with 5 threads per inch would
get what you want.
However, a 5 TPI (threads per inch) screw is way huge and probably
won't give you enough mechanical advantage. My little Sherline mill
uses a 20 TPI lead screw. I'd suggest you go with something standard
and readily available, like a 1/4" 20 TPI (course thread) lead screw,
or if you need it more beefy a 7/16" 20 TPI (fine thread). Since 20
is easily divisible by 5, you won't have to worry about any floating
point math with the stamp, and you'll get better accuracy.
Stew
On Fri, 16 Nov 2001 01:01:17 -0000, iamturbo2000@y... wrote:
>I am trying to make a CNC mill (Small one) Using the basic stamp. I
>am trying to use two stepper motors. I got a good program (i think).
>But I need help with what tipe of all thread (a long bolt without a
>head) I need. The steppers that I am using has a 1.8deg per step.
>And
>I want the table to move .001" per step. Please help.
>
>
>To UNSUBSCRIBE, just send mail to:
>basicstamps-unsubscribe@yahoogroups.com
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>Subject and Body of the message will be ignored.
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>http://docs.yahoo.com/info/terms/
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>
--
Stewart Mayer, stewlist@k... on 11/15/2001
They are sometimes sold in the surplus outlets like Mouser.
Dennis
Original Message
From: <iamturbo2000@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, November 15, 2001 5:01 PM
Subject: [noparse][[/noparse]basicstamps] Stepper Question
> I am trying to make a CNC mill (Small one) Using the basic stamp. I
> am trying to use two stepper motors. I got a good program (i think).
> But I need help with what tipe of all thread (a long bolt without a
> head) I need. The steppers that I am using has a 1.8deg per step. And
> I want the table to move .001" per step. Please help.
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
this kind of stuff.
As far as the thread pitch, your stepper motor apparently makes 200 steps
per rotation, which means you need a lead screw with 5 threads-per-inch.
360 degrees / 1.8 degrees = 200 steps per rotation
0.001 per step x 200 steps = 0.20" per rotation
1" / 0.20" = 5 TPI
Might want to check out the Heavy Iron articles in the last 4 or so Nuts &
Volts issues -- a guy is using an X-Y table to make a mill.
Original Message
> I am trying to make a CNC mill (Small one) Using the basic stamp. I
> am trying to use two stepper motors. I got a good program (i think).
> But I need help with what tipe of all thread (a long bolt without a
> head) I need. The steppers that I am using has a 1.8deg per step. And
> I want the table to move .001" per step. Please help.
math!
I'm too lazy to go in the garage and check, but I think most smaller lathes
and mills typically move 0.050 per turn of the crank on the cross / compound
/ longitudinal feed. (Unless its a weird Chinese / Indian / Pakistani made
product, and then its something weird like 0.062" per turn.
Original Message
> I'm kind of a novice stamper, but I've been machining for a while so
> lets see...
>
> 360 degrees / 1.8 degrees per step = 200 steps per rotation.
>
> This means you want one rotation to go 200 thousandths of an inch, or
> 1/5th of an inch. So, using a shaft with 5 threads per inch would
> get what you want.
>
> However, a 5 TPI (threads per inch) screw is way huge and probably
> won't give you enough mechanical advantage. My little Sherline mill
> uses a 20 TPI lead screw. I'd suggest you go with something standard
> and readily available, like a 1/4" 20 TPI (course thread) lead screw,
> or if you need it more beefy a 7/16" 20 TPI (fine thread). Since 20
> is easily divisible by 5, you won't have to worry about any floating
> point math with the stamp, and you'll get better accuracy.
> >I am trying to make a CNC mill (Small one) Using the basic stamp. I
> >am trying to use two stepper motors. I got a good program (i think).
> >But I need help with what tipe of all thread (a long bolt without a
> >head) I need. The steppers that I am using has a 1.8deg per step.
> >And
> >I want the table to move .001" per step. Please help.
the sun when it comes to the kind of parts your looking for. Including
lead screws from 1/4x20 to 1x10
Also leadscrew Supernuts
On Fri, 16 Nov 2001 01:01:17 -0000 iamturbo2000@y... writes:
> I am trying to make a CNC mill (Small one) Using the basic stamp. I
> am trying to use two stepper motors. I got a good program (i think).
>
> But I need help with what tipe of all thread (a long bolt without a
> head) I need. The steppers that I am using has a 1.8deg per step.
> And
> I want the table to move .001" per step. Please help.
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
Original Message
From: "Rodent" <daweasel@s...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, November 16, 2001 4:04 AM
Subject: Re: [noparse][[/noparse]basicstamps] Stepper Question
> (Unless its a weird Chinese / Indian / Pakistani made
> product, and then its something weird like 0.062" per turn.
It is not weird at all, it is metric, used by all the world
except US.
Regards
ECO
or 0.063 (or 0.064) -- God bless dial indicators.
We do use metric here though -- most US-made cars are half and half. My
wife's Nissan (Mercury) van has SAE bleeders on the front brakes and metric
on the rear.
Original Message
> > (Unless its a weird Chinese / Indian / Pakistani made
> > product, and then its something weird like 0.062" per turn.
>
> It is not weird at all, it is metric, used by all the world
> except US.