Is it better to consider cpk or cpm when trying to achieve an ideal target of zero deviation?

0 ⤊

Is it better to consider cpk or cpm when trying to achieve an ideal target of zero deviation?

2006-08-22 07:38:48 · 2 answers · asked by Bob 2 in Science & Mathematics ➔ Engineering

2 answers

CPM is better because it also indicates variation between process average and target value.

2006-08-22 07:56:55 · answer #1 · answered by Automation Wizard 6 · 0⤊ 0⤋

You should use ppk.
Cpk is used to measure the potential capability of a system to meet customer needs. It should be used to analyse a systems aptitude to perform. Ppk is used to measure the performance of a system to meet customer needs. It should be used to measure the systems actual performance.

In most cases, the process capability can be considered acceptable if the Cpk is greater than 1.00 and the Ppk is greater than 1.33.

2006-08-22 16:15:14 · answer #2 · answered by Jeffrey S 6 · 0⤊ 0⤋