Quote Originally Posted by alboy View Post
Sorry, was on another plane there. Confusing my MCS with WCS, don't know if that is a common phrasing but that is what DSP refers to as the machine home position and the Work home/zero position. Yes I have returned it to the zero work position after homing and then drilled down with a 2mm drill bit, did this 10 times and was spot on each time??

Al
So if I understand you, you are saying that it comes back to the zero work spot in X and Y as you are going down the same hole. But how are you testing the Z zero, is that coming back to the same spot. You could test this by setting work Z to say 10mm above the bed and checking it with a 10mm round rod or a spacer exact. Then run the machine and come back to work Z zero and see if the spacing is exactly the same. ..Clive