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Discussion Thread Title: Cpk Formula seems off, need help!?
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Old 25th July 2017, 10:26 AM
Aleforge

 
 
Total Posts: 4
Thank You! Cpk Formula seems off, need help!?

This is driving me nuts. I have not completed many CPKs before and previously I have used a template to calculate each data set. It was setup for only 30pc inspections, but the new customer needs a 35pc. So I attempted to modify my excel sheet to incorporate the extra parts. However I am getting weird CPK results.

For instance I have one sample that only deviates .002 from the nominal (tol is +/- .005). However my CPK number is coming out as .8468. That does not seem right to me? As I mentioned I am fairly new to CPKs in general and relied solely on a template that I did not create.

(ugh site won't allow me to link drop box file)

I was under the impression that "good" CPKs should hover around the 1.5 mark.

Thank you VERY much!

If anyone WILL take a look at the file please let me know and I will PM it.

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