Re: [CAD_CAM_EDM_DRO] pulley ratios for timing belts

Tim Goldstein wrote:

> > -----Original Message-----
> > Jon Elson wrote:
> >
> > Steppermod is a little faster, but gives rough steps. Freqmod is much
> > smoother, but takes more CPU resources. I don't think 5 KHz is a limit
> > unless you insist on Pentium I (classic) processors. If you can get a
> > 333 - 450 MHz pentium II, I think you can go well above 5 KHz without
> > trouble. These CPUs are cheap now, where they were expensive top of the
> > line systems 2 years ago.
>
> In the context of a G3X0 the smoothness of the steps is not relevant. In
> nontechnical and maybe somewhat conceptual terms in the G3X0 the steps just
> drive an accumulator and the encoders drive another. A comparator looks at
> both and generates the error signal. The accumulator does not have any of
> the resonance and acceleration issues that the rough pulse pacing of
> steppermod outputs.

Right, I didn't notice that part of the question until a little farther down
in the original post.

If you are using rate multiplied, many microstepping or step-pulse to servo
drives, then steppermod would be best, as it allows higher rates from a
particular
CPU speed.

Jon