Re: breakout boards plus - hard choice

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@...> wrote:

>

I think Mariss' idea uses a step driver which has a

> master current setting, so the controller can ramp the current
> up as needed to drive the mechanical load. It might work with a
> G201 or G203 drive without the pulse multiplier (which
> complicates the phase relationship a lot). The motor would run
> hotter as it runs at full current all the time. Then again, the
> current modulation may be part of the key. I certainly have not
> done this.

I was under the impression that the "unstallable stepper drive" just
slowed the feed down to get more torque (presumably it talks to the
motion controller) and although the motor might come to a complete
stop that isn't a real stall because the driver decided to slow it
down to a stop. Obviously you are not supposed to try and push the
point.

All sounds very nice but I'm not sure what it will do to surface
finishes, I cant help but think its better to stick the correct sized
motor and use proper feeds and speeds people have done that for a long
time perfectly well.

Graham