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  Measurement, Test and Calibration

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Author Topic:   Bias/Repeatability
Larry Wade
Lurker (<10 Posts)

Posts: 1
From:Columbus, In U.S.
Registered: Jul 1999

posted 26 July 1999 09:41 AM     Click Here to See the Profile for Larry Wade   Click Here to Email Larry Wade     Edit/Delete Message   Reply w/Quote
Hi I am the quality engineer and calibration supervisor of our QS9000 registerd company. Up until now we had performed only Gage R&R and calibrations on our gages and equipment. Our auditor has since asked us to do some form of repeatability test before calibration. I have looked in the MSA book for QS9000 at the examples of Bias, Stability and Repeatability. I believe what he is looking for is actually more along the lines of Stability or Bias. My problem is what is concidered an acceptable percentage. I can not find anything in the MSA manual.

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Forum Contributor

Posts: 64
From:West Chester, OH USA
Registered: Jul 1999

posted 27 July 1999 07:37 PM     Click Here to See the Profile for TheOtherMe   Click Here to Email TheOtherMe     Edit/Delete Message   Reply w/Quote
You have to relate your results to a percent of tolerance, as I understand it. That with gage R&R. The MSA manual talks about looking at it all as a 'system'. If I understand it correctly, they want to make sure you are considering all the system elements. You may get away with not doing linearity or bias calculations if you can argue the precision of the measurement device far exceeds the tolerance (extreme case --> using a cmm to measure a 0.9 +/-0.1 meter rod). But then, you always know the linearity and bias and stability and uncertainty of the cmm simply because the manufacturer provides them for their products due to their very nature.

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA

posted 20 March 2000 11:27 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Also see

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