I was asked to do SPC on a TP call-out. I have a 0.1873" hole with a +/-0.0002" size tolerance and the following TP call-out:
0.0005 at MMC to A (a datum plane), B at MMC (a datum cylinder with a virtual condition) and C at MMC (a datum cylinder with a virtual condition).
I believe that the type of a call-out represents a functional gauge and it either fits, or it does not. So I think it is a go/no-go type analysis and SPC will not be meaningful, if not outright impossible. But of course management would like to know how the can calculate Cp and CpK for this TP.
Anybody any words of wisdom???
Jan.
0.0005 at MMC to A (a datum plane), B at MMC (a datum cylinder with a virtual condition) and C at MMC (a datum cylinder with a virtual condition).
I believe that the type of a call-out represents a functional gauge and it either fits, or it does not. So I think it is a go/no-go type analysis and SPC will not be meaningful, if not outright impossible. But of course management would like to know how the can calculate Cp and CpK for this TP.
Anybody any words of wisdom???
Jan.

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