Re: Acme / Ball Screw conversion

Don't forget that table backlash in a mill can have two sources - one
is the drive screw/nut combination. The other is the thrust
bearings at one end of the drive screw. If they are ball or roller
thrust bearings, there is usually no trouble tightening them up to
eliminate backlash. But many inexpensive mills use plain bearings
that cannot be tightened enough to eliminate backlash without locking
up. If you face the plain bearing problem - you may be able to
retrofit roller or ball thrust bearings thereby dramatically
improving your mill.

Good luck - Bruce Griffing