stoneaxe
Stainless
- Joined
- Mar 2, 2010
- Location
- pacific northwest
I ran into a puzzle- my VN 12 x-axis has some unexplained backlash.
The leadscrew nut has about .005" backlash, necessary because the screw is worn some. (It get tight at the ends of the travel on the unworn threads if no backlash. I can easily feel the free play in the handle, and when it comes up against the nut threads.
But- AFTER the freeplay is taken up, I still get no table movement for another .005".
Almost like the leadscrew nut is loose, or maybe the angular thrust bearings on the leadscrew to table connection are moving a little.
IIRC, this machine has a housing on the table that accepts two angular thrust bearings, that trap a shoulder on the leadscrew, and the bearing are pushed together by a threaded collar. I tried tightening the collar, but it is pretty snug. I was wondering if perhaps the collar is not putting pressure on the bearing outer race, maybe bottoming in the threads?
Any ideas?
The leadscrew nut has about .005" backlash, necessary because the screw is worn some. (It get tight at the ends of the travel on the unworn threads if no backlash. I can easily feel the free play in the handle, and when it comes up against the nut threads.
But- AFTER the freeplay is taken up, I still get no table movement for another .005".
Almost like the leadscrew nut is loose, or maybe the angular thrust bearings on the leadscrew to table connection are moving a little.
IIRC, this machine has a housing on the table that accepts two angular thrust bearings, that trap a shoulder on the leadscrew, and the bearing are pushed together by a threaded collar. I tried tightening the collar, but it is pretty snug. I was wondering if perhaps the collar is not putting pressure on the bearing outer race, maybe bottoming in the threads?
Any ideas?