Re: Aaah! (Magically Moving Steppers)

At 11:47 29/12/2002 +0000, you wrote:

> >I then watch the rear-shafts of the motors, and though they were
> >holding still before, they now roll back and forth every few seconds
> >by a small amount. Aaah! I'm thinking this is due to induced mains
> >hum throwing the dir/step pins. Any advice?
>
>I had the same problem.
>Obviously it's noise from the Sherline DC motor.
>
>Tried wrapping the Sherline motor cable in aluminum foil (!),
>putting a snap-on ferrite bead on the power line,
>plugging sherline into different outlet, etc. Nothing worked.
>
>What fixed it was R-C filters on the step-input to the stepper drivers.

What values of R and C did you use?


Regards,
Tony