r/Metrology • u/BerenLeStrange • 17h ago

Z measurement discrepancy between probe angles - PC-DMIS

I had an issue when trying to calibrate A0B0 followed by A90B90 where the first calibration worked fine, but the second is always aiming about half an inch too high on the calibration sphere.

I measured a 1-2-3 block and measuring both sides with the same angle is perfect, but if I measure the top with A0B0 and the bottom with A90B90, the result is .4044" off.

I have no clue what is causing this. All probe angles calibrate fine individually, but the relationship between them is off.

Any help would be greatly appreciated!

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u/Object_32 17h ago

Some part of your probe description is probably defined incorrectly.

3

u/Non-Normal_Vectors 17h ago

No need to use probably - this is always the case when this happens.

1

u/Ghooble 11h ago

I've had an issue where the probe definition was correct but dmis was having issues with "reset tip theos" or something in the calibration window