Assume the process has not shifted from the center of the specification. A) A me

Question

Assume the process has not shifted from the center of the specification.

A) A measurement system used for a manufacturing process has 10% R&R on tolerance and 10% bias. Determine Cpa of process if its Cpko=1.50.

B.) A measurement system used for a manufacturing process has 30% R&R of TV and 20% bias. Determine Cpa of the process if its Cpko=1.50.

C.) A measurement system used for a manufacturing process has 30% R&R on tolerance and 20% bias. Determine Cpko of process if it’s Cpa=1.50.

Explanation / Answer

the observed process capability is the combination of actual process capability plus the variation due to measurement process.

A) cpko=cpa+(0.1-0.1) = cpa + 0

here cpa=1.5

Therefore, cpko = 1.5 + 0 = 1.5

b)cpa= 1.50-(0.30-0.20)= 1.5 - 0.1 = .40

c) cpko=1.50+ (0.30-0.20)= 1.5 + 0.1 = 1.60

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