Can I use a Laboratory CMM for Gauge Calibration

J

JaxQC

#11
An easy way to remember TS16949 for the labs is that if you go outside, the lab should be ISO 17025 sometimes slang as Guide 25 or A2LA or the OEM of the device if no other services are available.



The loophole is if you do it in house. Then you don’t need 17025. What you do need though is to have the calibration of that type item listed on your own Lab Scope, defined methodology and (NIST) traceable tools for checking that type item that takes into consideration: acceptance criteria, linearity, stability & bias.



While the 1:10 ratio is a rule of thumb it basically is just saying that you want your checking tool to be 10x’s more accurate that what it is being used to check. Can you go with a lesser amount…sure. Just realize that it directly goes back to your measurement error
 
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Hershal

Metrologist-Auditor
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#12
Short answer as to whether you can use the CMM is: perhaps.

Some considerations however.

First, if the CMM is used for anything except calibration, then it is instantly suspect as a measurement standard. To assure it is acceptable, it will need to be calibrated immediately before its use as a measurement standard, and the uncertainty and traceability documented.

Second, for the items you want calibrated, the traceability and uncertainty must be documented.

If the traceability chain and the uncertainty are not documented, then there is no traceability and the exercise is pointless.

Also, as to slang, the term is accredited. Guide 25 was retired in 1999 and is not in use. A2LA is an organization, not an accreditation, and is not properly used in that manner, regardless of what one may hear on the street.

Remember that there are 6 ABs based in the U.S. that accredit general test labs, all of which are recognized internationally. 2 others are recognized, but are industry-specific.
 
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