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calculating CPK's

Ken379128
I was wondering if anyone has had this problem.

I run a program get my 30 pcs data send it to data page and the calculation from data page is different when done with a calculator. I got a cp 5.18 and a cpk of 5.21. I thought the cp had to be bigger? Then when I did it on my calculator I got the cp at 5.55 and the cpk at 5.52Confused
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  • I was wondering if anyone has had this problem.

    I run a program get my 30 pcs data send it to data page and the calculation from data page is different when done with a calculator. I got a cp 5.18 and a cpk of 5.21. I thought the cp had to be bigger? Then when I did it on my calculator I got the cp at 5.55 and the cpk at 5.52Confused

    Are you calculating the Cpk of a TP feature? Datapage can not correctly calculate TP CPK because it has, as a limit, a perfect zero deviaiton, in order for it to correctly calculate TP CPK, you need to manually edit the tolerance for the TP dimension and give it a negative tolerance equal to the positive tolerance. You will have to do this every time you want to make a report after saving the data to Datapage.
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  • I was wondering if anyone has had this problem.

    I run a program get my 30 pcs data send it to data page and the calculation from data page is different when done with a calculator. I got a cp 5.18 and a cpk of 5.21. I thought the cp had to be bigger? Then when I did it on my calculator I got the cp at 5.55 and the cpk at 5.52Confused

    Are you calculating the Cpk of a TP feature? Datapage can not correctly calculate TP CPK because it has, as a limit, a perfect zero deviaiton, in order for it to correctly calculate TP CPK, you need to manually edit the tolerance for the TP dimension and give it a negative tolerance equal to the positive tolerance. You will have to do this every time you want to make a report after saving the data to Datapage.
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