Not sure if this question is already asked.

I want to sell the concept of GR&R to the equipment maintenance group by translating thier GR&R result to something easy to grasp.

I came out with this:

Formula= (Process Mean - Specs)/(Variability attirbuted to Gage)

then i want to correlate it with the Yield, to drive the point that GR&R affects Yield.

Question:
1. ) Hope this version of Process Capability makes sense?
2. ) If this formula exists in literature, what it is called? (Gage Capability or something?)

Thanks in advance!!!:thanx:

There are two existing ways that you might use to get your point across.

1) Yield is driven by process capability. Process capability is driven by the observed process variation. Cp=Tolerance/6*(StdDev-observed).

(StdDev-Observed)^2 = (StdDev-Actual)^2 + (StdDev-measurement)^2
Therefore:
(StdDev-Actual)^2 = (StdDev-Observed)^2 - (StdDev-measurement)^2

Since (StdDev-actual) is less than (StdDev-Observed), the capability index is greater, and theoretically so are yields.

2) Create a gage performance curve as shown in the MSA manual. Show the risks of accepting out of spec product and rejecting good product graphically.

2) Create a gage performance curve as shown in the MSA manual. Show the risks of accepting out of spec product and rejecting good product graphically.

Thank you very much.

Especially #2 , which is much appreciated.

:thanx: