9.3. GAUGE R&R
Most Six Sigma classes teach a process called gauge R&R, but the method taught addresses only repeatability and reproducibility, not accuracy (aim). Gauge R&R uses production products, rather than masters. To get valid results, the current production products must include the full range of process dimensions, which are not always readily available. If the test samples do not include the full range of process dimensions, the gauge R&R will often not pass.
The gauge R&R output is given as an ANOVA (analysis of variance), a rather sophisticated mathematical method that allows for the separation of gauge error into operator, gauge, and part contribution. The idea in gauge R&R is that, if the operator is the key contributor to the ...
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