Re: Erratic stepper question.

Hi,

The problem you are seeing is common with full-step and half-step
drives at low speeds. The only cure is to add significant friction to
damp the low speed resonance or use a microstepping drive. Possibly
the "taking off" in the wrong direction is a manifestation of the
same problem; severe low speed resonance.

Mariss

--- In CAD_CAM_EDM_DRO@y..., andesign2@y... wrote:
> I have recently finished assemblying my 3 axis 5amp stepper driver
> from Camtronics and my homemade power supply. I downloaded the
CNCPRO
> demo and ran each stepper motor in air. I noticed that at certain
> speeds the motors shuttered, especially at very low speeds. I also
> loaded the example 3D arc G code file that came with the software,
> when I tried to run it the motor shuttered a couple of times at low
> speed. As the speed ramped up sometimes the motor would take off
> really fast in the wrong direction. I am running in half step mode
> and I believe all of my software and driver configurations are
setup
> correct. Could anyone please tell me if I'm missing something.
>
> The motor details:
>
> Superior Electric
> Slo-Syn Synchronous/Stepping Motor
> Type= M091-FD-426
> 150oz.in
> 200 Steps
> 2.6V 3.1A DC
> 6 wire
>
> I bought these motors at C and H Sales.
>
> Thank You,
>
> Jason