Re: Facing question and wp length problems
My guess is that it is the machine, setup, or offset as opposed to the program, as I see no glaring errors in your code.
-Are you positive that your front turn is facing material?
-Are the bars ground? Variation in the bar diameter could be a culprit
-Excess Guide bushing tension could possibly bind up the bar and cause it to slip in the collet. Can you move the bar though the GB by hand?
-Have you tried over feeding in Z+ then going Z- to your cutoff length? for example Z90; Z82;?
-Since you go to Z-12. to deburr/de-chip the part right before cutoff, could a chip sometimes bind up the bar when it goes back to the cutoff length causing the bar to slip just a tad?
--Along the lines of the last one, Do you put a chamfer on the bar every time you retract into the GB? I have seen bar burrs cause variation in the OAL.
Check off those and I'll keep going
CNC Product Manager / Training Consultant