RE: [CAD_CAM_EDM_DRO] Stepper motor noise (was Re: Chopper Transient Suppression)

HI Wayne,

Yeah, that could make a difference! Glad to hear your driver is working.

Alan KM6VV

> > Hi Wayne,
> >
> > You're probably just hearing the chopping frequency.
> > Shouldn't be terribly loud. Come over, and give a
> > listen to mine! (Gecko drives, of course!).
>
> Yes, it was chopper noise, and it was, in fact, a bug
> in my firmware. There is a clock prescaler in the PIC
> microcontroller and I set it to a value of 2 instead of 0.
> This meant the clock was being divided by 8 rather than 2.
> So my refresh frequency was 6250Hz (=25000/4) rather than
> 25000. As soon as I fixed the firmware error and fired
> everything up, the motors are silent when standing still.
> There is a pleasant whirrring sound when they are in motion.
> I am pretty jazzed.
>
> I'll contact you off list about visiting your CNC
> system. I'll haul mine along for comparison.
> Now that the holidays are over, it should be easier
> to find a mutually convenient time to meet.
>
> -Wayne