Re: [CAD_CAM_EDM_DRO] rapid G210 'overdrive' rates using logic on header blocks

Tim Goldstein wrote:

> The problem for me is not that I can't put out enough steps to get the rate
> I want. I am running a fast enough computer that I am getting an adequate
> step rate. The problem is that if I use a set of G2XX stepper drivers the
> torque will drop off with the low voltage at a pretty low step rate.

Will the torque drop-off matter if you are 'rapiding' through thin air?

My unstated assumption was that the 'overdrive' was for low-load
high speed movements (just like an overdrive gear in your car transmission).

In my case, my upper limit is around 8K steps/sec. Does the Series II
have a 5 TPI screw and a 180 step stepper? With 1/10 stepping only,
that would imply around 819/(180*5) = .91 inch/sec = 54.6 inch/minute
rapids (tolerable, but not great).

For example, 'overdriving' to 1/2 steps (from 1/10 steps) increases
that rapid rate up to 273 inches/minute.

Doug Fortune
http://www.cncKITS.com