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Discussion Thread Title: Cpk Formula seems off, need help!?
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Old 25th July 2017, 12:29 PM
Bev D's Avatar
Bev D

 
 
Total Posts: 3,631
Re: CPK formula seems off, need help!?

without seeing the data I would venture a guess that the example you have given is due to chunky data. chunky data is data that has very few possible results compared to the range of the variation. (for example if the range of variation goes from .001 to .005 and the resolution of the gage is in .001 you will have chunky data) Chunky data results in an overstated standard deviation which would then result a smaller Cpk.
Thanks to Bev D for your informative Post and/or Attachment!

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