Our shop has a Puma 200 lathe with a Mitsubishi control, sometimes when touching off tools you can jog the tool untill the light comes on and it inputs the correct Geo. offset #, but maybe 1 time in 10 when you back off the tool the number will change by about 2"??? If your not watching the display when you back the tool off the setter you may not catch the error untill you go to use the tool, but I haven't crashed because I always check new setups closely before running and the error so far has been to where the tool would cut big on O.D. and short on length. The probe was replaced about a year ago because of a dummy operator crashing a tool into it, but this is a new problem in just the past few weeks and the probe hasn't been crashed, so I don't think the probe is bad because both X & Z act the same way, and I don't want to have to get another $600 probe. Any Ideas?