Re: New to Metrology and told to complete Gage R&R
While the rest of the advice was fine, this may be bad advice depending on the metric in which you are interested.
If you are using the measurement device for part inspection and are using %Tolerance as you metric this is acceptable. However, if you are using the device for process control, the parts should represent actual process variation. They should never be hand selected to increase that variation just to pass %Study Variation or ndc. In fact, the best approach is to use the results from a capability study and use %Process Variation in lieu of %SV.
The key I mentioned above is making sure those 10 parts represent the full range of your spec, or you may fail because you don't have much part-to-part variation in the analysis. If your spec is "5.0mm +/- 0.5mm", try to include a part around 5.5mm and a part around 4.5mm in your 10-part trial.
If you are using the measurement device for part inspection and are using %Tolerance as you metric this is acceptable. However, if you are using the device for process control, the parts should represent actual process variation. They should never be hand selected to increase that variation just to pass %Study Variation or ndc. In fact, the best approach is to use the results from a capability study and use %Process Variation in lieu of %SV.
