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Measurement error


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I was trying to measure a ring gage to correlate with our ULM system when I noticed that the dimensions were way different.

Ring gage should have measured 2.99996 and CMM is measuring it at 3.00046 a difference of .0005.   Have also checked gage blocks and getting error within .0005 - .00076.

Machine is a Zeiss Prismo with a Vast Gold head.  I have verified that the correct head is selected, the calibration sphere dimensions are accurate, requalified Master, and probe used for inspection has been calibrated as well.

What am I missing?   Is there something else that could be causing this error?

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