Semi-OT - servomotor circuit
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Posts: 46,084
I've just had the opportunity to recover some Honeywell modulating
motors that are not operational. After examining them I've determined
that the fault is thier position feedback gizmo. What they use is two
semi-circles of (apparently) painted on resistive material around the
shaft and a couple copper arms that slide over them. Basically just a
big variable resistor. The resistive material has worn through to the
PCB underneath so the feedback is no longer operational.
Would anyone happen to know if I can purchase a paint-on resistive
material at all? I can use an ohmmeter to find out the ohms per inch
or whatever.
If I get these functional I can have some great fun interfacing them.
At 80lbs torque they'd be capable of some real work. I'd just have to
cook something up!
motors that are not operational. After examining them I've determined
that the fault is thier position feedback gizmo. What they use is two
semi-circles of (apparently) painted on resistive material around the
shaft and a couple copper arms that slide over them. Basically just a
big variable resistor. The resistive material has worn through to the
PCB underneath so the feedback is no longer operational.
Would anyone happen to know if I can purchase a paint-on resistive
material at all? I can use an ohmmeter to find out the ohms per inch
or whatever.
If I get these functional I can have some great fun interfacing them.
At 80lbs torque they'd be capable of some real work. I'd just have to
cook something up!
Comments
for defrosters could work. You 'paint' this stuff on,
and then heat it with a heat gun (I think 800 degrees)
to cure it. If the disk will take the heat, this
could work. My Honda dealer had the stuff for
repairing rear window defrosters.
--- In basicstamps@yahoogroups.com, "ghidera2000" <ghidera2000@y...>
wrote:
> I've just had the opportunity to recover some Honeywell modulating
> motors that are not operational. After examining them I've
determined
> that the fault is thier position feedback gizmo. What they use is
two
> semi-circles of (apparently) painted on resistive material around
the
> shaft and a couple copper arms that slide over them. Basically just
a
> big variable resistor. The resistive material has worn through to
the
> PCB underneath so the feedback is no longer operational.
>
> Would anyone happen to know if I can purchase a paint-on resistive
> material at all? I can use an ohmmeter to find out the ohms per
inch
> or whatever.
>
> If I get these functional I can have some great fun interfacing
them.
> At 80lbs torque they'd be capable of some real work. I'd just have
to
> cook something up!
just about any surface... I do not know if it would hold up in your
situation, but it might be worth a look....
A quick google search game me a couple of links:
http://www.contacteast.com/product/prodpage.cfm?grp=4088BDCD-EEE0-11D4-8
A710050DA5FEB55
http://www.circuitspecialists.com/level.itml/icOid/823
--Aaron
Original Message
From: ghidera2000 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Tl-YdPrKif2ctvw4PB6ewfkkUHy67jWNbJq2b7R_r15ZEVYnp1mJS0wNtBsdhlLWSnj0ud_T1Sr8x4sWKw]ghidera2000@y...[/url
Sent: Friday, March 07, 2003 6:01 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Semi-OT - servomotor circuit
I've just had the opportunity to recover some Honeywell modulating
motors that are not operational. After examining them I've determined
that the fault is thier position feedback gizmo. What they use is two
semi-circles of (apparently) painted on resistive material around the
shaft and a couple copper arms that slide over them. Basically just a
big variable resistor. The resistive material has worn through to the
PCB underneath so the feedback is no longer operational.
Would anyone happen to know if I can purchase a paint-on resistive
material at all? I can use an ohmmeter to find out the ohms per inch
or whatever.
If I get these functional I can have some great fun interfacing them.
At 80lbs torque they'd be capable of some real work. I'd just have to
cook something up!
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they use to repair rear window defrosters it comes
in a little bottle like nail polish it's a type of
conductive ink with some resitence in it you would
have to experiment i have heard of people reparing
potentiometers with it [noparse]:)[/noparse]
--- Aaron Bond <abond@q...> wrote:
> Years ago I purchased a pen that one used to write
> circuit traces onto
> just about any surface... I do not know if it would
> hold up in your
> situation, but it might be worth a look....
>
> A quick google search game me a couple of links:
>
>
http://www.contacteast.com/product/prodpage.cfm?grp=4088BDCD-EEE0-11D4-8
> A710050DA5FEB55
>
>
http://www.circuitspecialists.com/level.itml/icOid/823
>
> --Aaron
>
>
Original Message
> From: ghidera2000 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RTEpEC2uPPrju5P4O_5Bbd0XWs9g-mwG65wXj0eD-KCQBJmJFM0EWnqOSRba6JIfbhPXnRKm9YVpuK6mglLa]ghidera2000@y...[/url
> Sent: Friday, March 07, 2003 6:01 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Semi-OT - servomotor circuit
>
>
> I've just had the opportunity to recover some
> Honeywell modulating
> motors that are not operational. After examining
> them I've determined
> that the fault is thier position feedback gizmo.
> What they use is two
> semi-circles of (apparently) painted on resistive
> material around the
> shaft and a couple copper arms that slide over them.
> Basically just a
> big variable resistor. The resistive material has
> worn through to the
> PCB underneath so the feedback is no longer
> operational.
>
> Would anyone happen to know if I can purchase a
> paint-on resistive
> material at all? I can use an ohmmeter to find out
> the ohms per inch
> or whatever.
>
> If I get these functional I can have some great fun
> interfacing them.
> At 80lbs torque they'd be capable of some real work.
> I'd just have to
> cook something up!
>
>
>
>
> 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/
>
>
>
>
> 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/
>
>
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