What I was trying to point out is that if the upper part of the PH10 that is attached to the Z ram of your CMM moved due to the collision then your calibration is invalid. It may or not be ok at A0B0 but if the upper part of the PH10 rotated due to the collision then when you measure something at A90B0 you will get goofy numbers.

Bob Connors
Lawrence Berkeley National Lab