%GRR tolerance analysis [GRR/(tolerance/6)]

[MrsBlue]

Hello!
Hope all has been keeping well!

I need some help to interpret an example of GRR results below.
I have always refer to the %GRR under the total variation analysis, and that result here shows 9.88% which is acceptable (< 10%).

How about the %GRR under the tolerance analysis [GRR/(tolerance/6)], which shows 15.83%? Does this need to fulfill the acceptance criteria of <10%?
How to interpret this result?
Any help or guidance is greatly appreciated.

Many thanks!

(I am unable to insert an image here, so I have manually type the formula & result into a table.)

Measurement Unit Analysis​	% Total Variation Analysis​	% Tolerance Analysis​
Repeatability - Equipment Variation (EV) EV = 0.00154	%EVv = 100 x [EV/TV] = 8.22%	%EVt = 100 x [EV/(Tolerance/6)] = 13.17%
Reproducibility - Appraiser Variation (AV) AV = 0.00103	%AVv = 100 x [AV/TV] = 5.49%	%AVt = 100 x [AV/(Tolerance/6)] = 8.79%
Repeatability & Reproducibility (GRR) GRR = 0.00185	%GRRv = 100 x [GRR/TV] = 9.88%	%GRRt = 100 x [GRR/(Tolerance/6)] = 15.83%
Part Variation (PV) PV = 0.01860	%PVv = 100 x [PV/TV] = 99.51%	%Pvt = 100 x [PV/(Tolerance/6)] = 159.40%
Total Variation (TV) TV = 0.01869	ndc = 1.41 x [PV/GRR] = 14

 

[Miner]

It depends on the intended use for the measurement device. If you intend to use it for inspection to a tolerance, % Tolerance is the appropriate metric and the other metrics can be ignored. Whether 15.83% is acceptable or not depends on your situation. The MSA manual clearly states that results between 10% and 30% might be accepted given certain circumstances. If the measurement device will be used for SPC then %Total Variation should be used, and %Tolerance can be ignored. The only time when you should consider both metrics is when the measurement device will be used for both inspection and for SPC.

 

[MrsBlue]

@Miner Many thanks for taking time to reply! Appreciate it.
Wishing you Merry Christmas and Happy New Year!!