Originally Posted by
sanddrag
I've always had the Renishaw probe in our machine, and it's offset has always been 5.5149. To the best of my knowledge, it's never been crashed. We've never ever replaced the tip on it. After making several parts that were coming out about .016 low in the Z, I checked the spindle probe offset, and it was indeed off. I recalibrated to the OTS on the table, and wouldn't you know it, the spindle probe offset is now 5.4995.
What would or could cause the spindle probe offset to become less all of a sudden?