Originally Posted by CNCPlastic  Z axis has an additional problem. It loses position towards the table on every up or down move and has done this since day one. Move 1 inch up and 1 inch down, it is now about .002 closer to the table than it was before. Move 10 inches up and 10 inches down, its now out of whack .020. I can typically only run 2-3 machining operations before I have to reset Z to the part. When I try to run several operations I'll be buried into my fixture plate .050 deep. |
Interesting. Are you running servos or steppers? Sounds like lost steps. Did you lap the machine?
Seems like the performance of the gibs and slideways on these machines has been pretty variable in the past. Some people, like myself, have had no trouble whatsoever. Others report problems like this, but it has usually been on machines purchased some time ago. They've undergone a pretty major update with the ground ways in the latest version. Not sure what I'd do if I had an oldie as temperamental as this sounds though. Keep trying to tweak it in, I guess.
Best,
BW