Re: [CAD_CAM_EDM_DRO] Dead zone in stepper power curve

Hi Ted,

Sounds like a resonance problem to me. A Gecko G210A drive
(microstepping) set to 1/2 step (which I presume you're using) fed with
your controller might shed some light on the problem. With the
microstepping, the resonances are for the most part eliminated.

I too have a controller program STEP4. Do you know about TurboCNC?
There's a list for it here on Yahoo.

Feel free to contact me off line.

Alan KM6VV


tedinoue wrote:

>
> I was wondering if anybody had encountered this problem. I'm
> developing my own stepper controller system and experience the
> following...
>
> when I run a smooth speed ramp, there are certain speeds at which
> the motor doesn't like to run. Not fast speeds, but slow ones. I'm
> running assembly on a microcontroller, and the pulses are very
> accurately timed.
>
> Depending on how I set the winding power (it's a chopper drive), I
> can tune out these dead spots. Usually by decreasing the power.
>
> Do you think this is a resonnance problem? Or is it more likely to
> be a problem with my code?
>
> I've scoped the waveforms and they are uniform and glitch free
> through the problem speed zone.
>
> Any thoughts?
>
> Thanks,
> Ted