Re: [CAD_CAM_EDM_DRO] Re: anyone knows a good source for

thanks dave and john, that was exactly the info i
wanted, delivered quite concisely.



--- bulshatar <datacrane@...> wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, juan gelt
> <juangelt@y...>
> wrote:
> >
> > as long as the topic arises, i have a question on
> the
> > actual performance of a microstepping controller
> vs
> > not.
> >
> > let's say the native resolution of a stepper is
> 200
> > steps/rev. the error would be +- 1/2 step. so i
> can
> > see half steps being somewhat realistic. but as
> one
> > attempts to position a rotor between those teeth
> based
> > on analog voltage of the coils, i have doubts as
> to
> > how accurate those can turn out to be on different
> > motors under different loads. in fact, it seems
> > downright spurious.
> >
> > so is there anyone with actual experience using
> both
> > types who can testify?
> > does the part that comes off a machine with
> > microstepping control in any way differ from the
> part
> > that comes off the machine using 1/2 steps or
> single
> > steps?
> >
> > plz, no theory - i get that part - does it work?
> and
> > if so how well and in what respects - just
> smoother?
> >
> >
> >
> Yes, it works! Not so much for improved resolution
> but for smoothness
> of the motors and acceleration throught resonance
> bands. I have two
> edentical steppers on a gantry router, one with a
> half-step driver
> and the other with a microstepping Gecko. There is
> no comparison
> between the two. The motor with the Gecko sounds
> almost like a servo.
>
> Hope this helps,
> John
>
>
>
>
>
>
>
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