microstepping was Re: stepper vs. servo

Yes, if you're asking about sin/cos current levels to achieve
microstepping...

All microstepping is based on approximating sine waves in the coils
of the stepper. (and just to be clear, the sin/cos relationship is
used to start with, but often adjusted for more accurate microsteps
with a given motor/drive combination.)

Ballendo

P.S. A second point is that you don;t have to use the "expected"
locations for your microsteps (if you're designing the drive). By
using offsets from the "normal" degrees of electrical "rotation"--
normal would be 0,90,180,270; or 45,135,225,315 for
fullstep/halfstep. with microsteps spaced between. But say you
started on 5 instead? So 5,95,185,280... This may allow a given motor
to run more smoothly. The steps are still the same number of degrees
apart, but their RELATIONSHIP to the mechanical structure of the
motor has changed. And this can be a good thing. (note that my use of
the number 5 above was arbitrary)

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> Don't the Gecko 201 and 210 do this?
>
>
> [Non-text portions of this message have been removed]