1997 Fadal VMC 6030 (AC servo motors)
When running a large program via DNC, its programmed for a rapid Z axis move up to clear the piece, and then X and Y move to another location.
However about once a month during the Z axis rapid move, it does not go up high enough to clear the piece, short by 1-2" and then it crashes badly and breaks off the tool. The program has been checked, no iussues. If the rapid knob is turned down to 50% from 100%, its seems ok.
The operator confirmed that it only does this on Z axis during a rapid move, when rapid it set to 100%.