Re: Microstepping thru the Tulips

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Steve Stallings"
<stevesng@...> wrote:

>
> violent agreement indeed, except for your assumption
> of what most folks consider high speed.
>
> If we assume Gecko drives microstepping at 10 micro-
> steps per full step and the known appx. 20KHz PWM
> rate, then we get a possible 10 rev. per second or
> 600 RPM with microstepping still nominally functioning.
>
> Apply this to a Bridgeport with 5 TPI screws and
> 2:1 gearing (typical of Boss series) and you get
> 60 inches per minute. Not blindingly fast, but a
> long ways from slow.
>
> Cheers,
> Steve Stallings
> www.PMDX.com
>

<HUGE snip>

My understanding is that microstepping shows it's best face on slow
speeds and acceleration, and that at *some* point, becomes
inconsequential.

but,

those useful speeds are the most common to actually use the motor.
not rapids, but cutting speeds.

Personally, I could care less of the smootheness of a rapid, as long
as there were no missed steps.

It seems the question what speed is considdered slow enough to benifit
from microstepping and what is too fast to need it ? And that appears
to be dependant on power supply voltage, motor inductance and maybe
some other factors ?



Dave