From: Stan Hilliard
Date: 13 Oct 2000
Time: 20:36:12
Greetings Yoon,
See the similar application in a thread that starts Sept 20, 2000. Could it be the same application?
Your Cpk is related to the K values of a variables sampling plan. (K = Cpk times 3.) If you are going to take a new sample at incoming, I recommend that you set it up a variables sampling plan with known standard deviation -- according to the method described in the tutorial: www.samplingplans.com/modern3.htm
Also use a plan for the range or standard deviation to check, for each lot, that the standard deviation hasn't changed.
Sincerely, Stan Hilliard