I'm looking for a milling spindle that can work in the range of up to 3000-5000 RPM. I've got a high-speed spindle installed on my DIY 8020 aluminum machine, and I find it somewhat limiing, for ex. I can't do any facemilling and I can't use any bits that are larger than, say, 1/4" (on metals, I mean).
I've seen some people mention using servos as a spindle motors. Has anybody done that? How's this work?
Another thing I'm considering is getting the head assembly from littlemachineshop or Sherline (P/N 6513, 6514). However, Mini Mill assy seems to have a dovetail (which I don't actually need) ,and Sherline doesn't give any dimensions of its headstock.
Any ideas?