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Range of accuracy when checking a circle

Can anyone tell me what the range of accuracy is in checking a circle diameter with a Romer arm vs. a mechanical bore gage? I have always been of the mind, and told so by people from Mitutoyo and Hexagon, that using a mechanical gauge over the CMM is always more accurate. Thanks for any info!
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  • Completely inline with my thoughts. I am trying to put in layman's terms, to a customer why data collected using a bore gage should weighed more heavily than results from the PCMM.

    I am not sure what type of discrepancies you are dealing with.
    I am sure that your PCMM has a spec sheet that lists accuracy.
    You could compare that the the specified accuracy of the bore gage.
    Maybe the difference will be enough to make your case.
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  • Completely inline with my thoughts. I am trying to put in layman's terms, to a customer why data collected using a bore gage should weighed more heavily than results from the PCMM.

    I am not sure what type of discrepancies you are dealing with.
    I am sure that your PCMM has a spec sheet that lists accuracy.
    You could compare that the the specified accuracy of the bore gage.
    Maybe the difference will be enough to make your case.
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