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TTImi TTImi
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6 years ago
A machine shop needs the diameter of the castings it purchases between 1.000 inch and 1.060 inches to insure that the surface finish will be acceptable. A large sample of castings found the mean diameter was 1.025 inches with a standard deviation of 0.008 inches. Calculate the process capability index.
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#1
6 years ago
UTL is 1.060 inches
LTL is 1.000 inches
Mean is 1.025 inches
Standard deviation is 0.008 inches

Cpk_UTL = (1.060 - 1.025)/(3  0.008 ) = 0.035/0.024 = 1.45

Cpk_LTL = (1.025 - 1.000)/(3  0.008 ) = 0.025/0.024 = 1.04

Cpk = min (1.45, 1.04 ) = 1.04
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