Suppose that the design engineering team set the specifications for length of a stamped sheet-metal part at 10 inches (d) with acceptable tolerances of ±.05 inches (usl and lsl). the average length of the products produced by the actual stamping process is 9.99 inches (m) with a standard deviation of .015 inches (s). the calculations for the cp and cpk are as follows: a. cp = (10.05-9.95)/6(.015) = .10/.09 = 1.11b. k = (10 – 9.99)/((10.05-9.95)/2) = .01/.05 = .20
c. cpk = 1.11 (1-.20) = 1.11(.8) = .88