Gage R&R studies for identical Devices - Need to confirm the requirement to perform them

#1
I have been challenged to defend or confirm the need to do a gage R&R on each of 10 calibrated caliper (identical make, model and means of calibration) or is there a standard that states a "family" of the same tool only needs 1 gage R&R to verify repeatability?
 
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Ninja

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#2
Standard...yes...ISO 9001:2015...it's about how you manage risk.
You (your company) defines whether the risk is worthwhile.

If it were me, I would randomly swap out calipers during the GRR work so that the data comes from all 10 sets.
That way you get a good judge of the whole test method.
...and the "Equipment variation" data can be used to justify your risk...assuming that you pass GRR
(I've never passed GRR with calipers or handheld micrometers for measuring anything).
 

Miner

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#3
I have never had problems creating gage families, particularly if the gages are identical models and you are measuring similar features. If you are still concerned, Minitab has an Expanded R&R study where you can add additional factors, such as the caliper used. Try 3 calipers in the study. If they are not significant, you can justify grouping all of them. If they are significant, you can run studies on all of them.
 
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