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Thread: Robotics with PIC16F877 anyone??
www.piclist.com/techref/microchip/devices.htm?key=16F
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face BY : Dan Michaels email (remove spam text)



David Duffy wrote:

Is it worth trying to use the stepper
>motors as 1:1 direct drive? (wheel on motor shaft) I suspect
>that there may not be enough torque to drive it along.

David,

If you are wondering about torque, try firing up the stepper
and seeing how difficult it is to stall it by squeezing the
shaft. As I mentioned last time, with the little Tamiya drive
set for 200:1 reduction, I have to exert quite a bit of force
to slow down the motor. Difficult to stall. And I cannot even
budge the motor by trying to turn the final gear [not the shaft].

A very common robo-hack is to take model airplane servo motors, eg
S-148 and HS300, and convert them for full rotation. Apparently,
they have enuf torque for minibots. However, even the cheapo
servos are expensive, $15 min apiece. I have some links to
servo and stepper motor robohacking:

http://www.oricomtech.com/emerge5.htm#Hobby2

best regards,
- Dan Michaels
Oricom Technologies
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