Re: [CAD_CAM_EDM_DRO] Aaah! (Magically Moving Steppers)

>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.


- Dom
http://www.microstepping.com/sherline/index.stm