Was milling an adapter 4 a S&S carb. on a Harley so the owner could use the stock air cleaner. I had finished the O.D. contour and then finished the holes,all i had left was the pocket in the middle left. Next thing i know right after changing to new endmill to cut pocket it did a G0 Z-1.249 and crashed the endmill into the piece. Checked the program and there it was,must have missed it when checked it before G0 Z- move then G0 Z2.0. Well my buddy was writing a program also and every time he used a G82 to drill the next tool change had the NEG Z move in it. My question is do others have the same glitch in there software with ver. X3. Also does it do it with the other drilling cycles too?
The reason that i've never run into this before is that i just graduated from CNC school and was working on 1 of there machines while looking for a job.This also seems to only happen on the DX-32 bridgeport mill.
Simplest way to find problems is small code snippets, play with the depths and post small easily understood programs using the toolpath type that is giving you a fit.