Do you get a regular scalloping on the surface? I haven't check it
out, but I think it's caused by the rack and pinion drive. I think
the teflon on the ways is getting thin which is causing the pinion to
engage too deeply in the rack

Do you have a single phase or 3phase motor. If its 3phase, what are
you using for a power source?

My grinder has 3phase motor and I run it from VFD. Works pretty well
considering I'm grinding dry. Someday I want to hook up the mist
coolent and see how much difference it makes.

chuck