Conducting Gage R&R - 300 plug gauges - Different diameters - One for each plug gage?

Miner

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gvalenti9 said:
If you do a GR&R, it needs to be appropriate to what you are trying to measure and the size of errors that you are trying to distinguish.

See the attached PowerPoint example.

I would do one GR&R for using plug gages. However, you may find that additional GR&Rs are required for sub-sets of the gages in order to prove that you can distinguish between the gages at a suitable tolerance, particularly for the smaller gages.

Greg
I disagree with the first portion of your Powerpoint file. The slides advocate selecting parts from the full range of the specification. This is incorrect if you are assessing the gage for the suitability for process control (i.e., %GRR). The parts should come from the full range of normal process variation. If the full tolerance range is used, the %GRR result will be invalid. Change the slide from the tolerance range to the process spread, and it will be correct. If your only intent is to assess the suitability of the gage for inspection to tolerance, and are using the P/T Ratio, you may select parts as you illustrated.

The last slide, which shows the multiple groups of parts was absolutely correct and the slide was a great way of illustrating it.
 
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