Typically, < 10% is excellent, 10 - 20% is acceptable, 20 - 30% is okay if the dimension is non-critical and the expense of improving the gage is not warranted, and > 30% is not acceptable. Also, there is more detail in other posts within this forum.
Variation | St Dev | %TV | %Cont
Eq Variance (EV) 3.681E-08 | 1.151E-03 | 0.47% | 37.06%
Interaction (INT) 2.152E-08 | 1.291E-07 | 0.00% | 21.67%
Appraiser (AV) 2.103E-08 | 8.701E-04 | 0.35% | 21.17%
System (GRR) 7.936E-08 | 1.443E-03 | 0.59% | 79.90%
Part (PV) 1.996E-08 | 8.478E-04 | 0.34% | 20.10%
Total Variation 9.933E-08 | 2.465E-01 | 100.00%
So looking at this data you say that the GRR should be < 30%. Is the % Total Variation number or the % Contribution number the one to look at? The %TV is 0.59%, extremely low while the % Contribution is 79.90% completely unacceptable.
If neither of these values are the correct one then what do you look at?
Thanks