Re: [CAD_CAM_EDM_DRO] Servo systems (was: re:cleaning, lovejoy, black box tach....)

Jeff Barlow wrote:

> The real issue here, I think, is maintaining coordinated motion.
> Intuitively, I seems to me that if one has fine enough position
> feedback, that should be sufficient.

Yes, given very high position resolution, and a high rate of sampling
that, it IS enough! Modern servo amps with encoder-only feedback
are now using 60 KHz as the servo update rate. EMC is using rates
between 1 and 10 KHz, depending on CPU and number of axes.
I'm getting great performance at 1 KHz from the CNC control, but
about 3-4 KHz bandwidth on the velocity loop.

Jon