Even though I just recently started using Mach3, I thought I knew what I was doing on setting z work offsets, but that was clearly presumptuous. Previously, I'd use a 0.002 inch shim stock as the gage, but I recently misplaced it, so I grabbed a 0.5 inch gage block to set Z offset. The bit never hit the part and was at least a quarter inch above the part. I reset the offset but entered the gage as being 1 inch thick. I noticed that the z offset value in the DRO only changed by 0.1 inch which seemed odd. The bit still seemed to be about the same amount above the part surface.
So I'm guessing that the previous gage was small enough that I didn't notice the difference. Now I need to make some parts that mate together in places so the 2 mil difference might be a problem.
Is there some other setting that has to be made to invoke the Z part offset?
I can work around it, but would rather understand how to do this properly.
Greg