How could not the material be fixed properly by fixture on a VMC? What exactly are you doing?


There is sth wrong from what you say that does not fit in the picture:

-Fit sensors on fixture and i don't see how that could happen. Or just a couple of fixed DTI.

-Or the material that is fed is smaller / thinner sometimes? Then adjust all so a sacrificial material is milled from top.

-if the bit is damaged, fit a simple Z zeroing DTI and make sure every start of program the bit touches it for a check.


And teach them to clean the fixture beforehand, and hammer down the pieces using plastic mallet, then fix. Cause that is what causes usually discrepancies when machining. best would be to hire a good machinist so he teaches the other.