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Process Capability - How much percentage of tolerance?

J

JAI GANESH

#1
#1
In a automotive manufacturing process, to achieve 1.67 Cp, how much percentage of tolerance i must have to use. Can any one help me out??
 
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Bev D

Bev D

Heretical Statistician
Staff member
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#3
#3
It's 60%. The inverse of the index gives the proportion of the tolerance 'consumed' by the process. If you look at the formula you will see that it is a measure of the tolerance divided by a measure of the process spread. So 1/1.67 = .6. Which is 60%

But remember the Xpk indices include the SD of the process AND the location of the process average in relation to the tolerances.
 
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