Comet77 said:
I need some help. We have filled in all the information form a GR&R in the GR&R anova spreadsheet and it is telling us that the gage is not working even though everything is well within spec. Help please.
The answer will depend on what you are using the gage to do.
If you are using the gage to inspect parts to specification, the gage is acceptable because the P/T Ratio is 12.5% of Tolerance.
If you are using the gage for SPC, the gage is not acceptable because the %GRR is 39.5% of process variation with an ndc (number of distinct categories) = 3. This means the gage can only distinguish low, medium and high values within the process variation.
The discrimination and reproducibility of the gage is good, the problem lies with the repeatability. One area that I recommend investigating further is the within part variation or variation in form. I noticed in the Measure By Part graph that there are significant differences in the repeated measures variation from part to part (see parts # 1 & 8 versus parts #3 & 4). If parts # 3 & 4 have significant variation in form (e.g. roundness) compared to parts 1 & 8, you would see a graph similar to this.