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Our plant has very tight tolerances. Most parts have a tolerance range of 20 microns. Right now I am working on a GRR for a roundness tester. The results were poor:
%Study Var %Tolerance
Source StdDev (SD) (6 * SD) (%SV) (SV/Toler)
Total Gage R&R 1.26179 7.57075 95.69 75.71
Repeatability 1.19401 7.16404 90.55 71.64
Reproducibility 0.40800 2.44801 30.94 24.48
Operators 0.40800 2.44801 30.94 24.48
Part-To-Part 0.38291 2.29744 29.04 22.97
Total Variation 1.31861 7.91167 100.00 79.12
Granted most of the variation is in the equipment(repeatiblity). The measurement was for concentricity. The max is 10 microns. The measurements were from @ 0.25 to 3.5 microns.
The distinct categories are 1.
Okay so this says that a very expensive and precise piece of equipment is useless for measuring this characteristic?
Can anyone provide some thoughts or guidance on this?
%Study Var %Tolerance
Source StdDev (SD) (6 * SD) (%SV) (SV/Toler)
Total Gage R&R 1.26179 7.57075 95.69 75.71
Repeatability 1.19401 7.16404 90.55 71.64
Reproducibility 0.40800 2.44801 30.94 24.48
Operators 0.40800 2.44801 30.94 24.48
Part-To-Part 0.38291 2.29744 29.04 22.97
Total Variation 1.31861 7.91167 100.00 79.12
Granted most of the variation is in the equipment(repeatiblity). The measurement was for concentricity. The max is 10 microns. The measurements were from @ 0.25 to 3.5 microns.
The distinct categories are 1.
Okay so this says that a very expensive and precise piece of equipment is useless for measuring this characteristic?
Can anyone provide some thoughts or guidance on this?