Re: [CAD_CAM_EDM_DRO] Re: Going home / more stepper speed!

Ballendo,

That's true! I was only thinking about the step rate required out of
the controller. Might be a good experiment to determine if half (or
even quarter?) stepping actually does reduce the resonance problems on
our hardware. I never cared for half steps before, due to the unequal
torque between steps (from what I understand). Seems to be useful in
our applications!

One of your previous post's to Ian (a keeper!) was Re: "faster stepper"
(snip below), and had an EXCELLENT description of stepper resonance
effects. However I'm a little curious about being able to see the
STEPPER "ringing" (overshoot, resonance's..) you describe on a SCOPE?
The "ringing bell" is exactly what I'd expect to see in a resonant
circuit all right. Are you talking about actually seeing these
waveforms on the drive currents to the coils?

Alan KM6VV (just curious)

ballendo@... wrote:

>
> Alan,
>
> Not always! Sometimes the reduction in "ringing" brought about by
> half-stepping cancels out the gains made by full stepping...
>
> Ballendo
>
> >Or if you have excess resolution, shifting to full step from
> >half step would give you a higher top end.
> >Alan M
>

ballendo@... wrote:

> The rotor magnet/coil combination inside the stepper has overshoot
> and settling during its' operation (since it is a magnetic FIELD that
> is doing the pushing/pulling; no defined machanical link). This is
> known as "ringing". Look at it on a scope and it looks similar to the
> output from a ringing bell.