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Discussion Thread Title: Cpk Formula seems off, need help!?
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Old 25th July 2017, 12:46 PM

Total Posts: 4
Re: CPK formula seems off, need help!?

OK, so I just edited the results and spread them around more. And the Cpk dropped down to a .3937.... All of the measurements still are inside the tolerance, but tilting towards both ends. Each time I changed one the Cpk dropped.

On my second set of measurements I have a Stdev of only .0009 , the above mentioned is a .0020 now. The .0009 Stdev one is giving me a Cpk of 1.7363


Thank you for helping. I wish I could link the file in here. This is driving me insane, and I have a customer breathing down my back (and starting to look like an idiot). =(

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