Another issue I've found, that I can't compensate for, is when using boring bits. Because the bit has a brad point, that is where the zeroing takes place, not the cutting flutes. On larger diameter boring bits, this can be as much as 2.5mm difference. Makes a HUGE difference when drilling holes. I've tried adjusting for this in one of the ATC files that holds Z-zero offsets, but each time you run any alignment routine, with the ATC, it resets these values. Not sure how to work around this. If anyone has any suggestions I'd love to hear them.