The table on the MD30 is 675 x 205mm approx and the travels are 490 x 195 x 105mm approx. The ballscrews are 16mm dia. I'm pretty sure my quill bearings won't like 5000rpm, they get warm on 2150! I was considering a secondary spindle based on an ER collet chuck, belt driven 1:2 or 1:3 off the main one, similar to what Robin's done (but probably nowhere near as neat :lol:).