Cp Cpk Out Of Tolerance. Process capability index cpk. Cp et nt usl lsl 6σ.
Cp et nt usl lsl 6σ. This is the capability index which accounts for centering of process and is defined as the minimum of cpk upper and cpk lower. The first capability ratio cp is defined as the ratio of the engineering tolerance usl lsl to the natural tolerance 3 s to 3 s.
This is the capability index which accounts for centering of process and is defined as the minimum of cpk upper and cpk lower.
Where s is the process standard deviation estimated from a range control chart. Percent that lie outside the tolerance limits. Cpk 1 00 means that 2 700 ppm 0 27 of the manufactured parts are out of tolerance while cpk 1 33 means that 63 ppm 0 0063 are rejects. Where s is the process standard deviation estimated from a range control chart.
