Interpreting Process Capability results and ratios

J

jdavisaltnation4

#1
Any help would be greatly appreciated. I hope I'm not over thinking this. Maybe someone can help clarify?

Question: a) Based on the sample, was the process capable at a +/- 3 Sigma quality level (99.7%) with the old specification?


I have a Cp of 1.000141 and a Cpk of .872345. The Cp does equal 1 but the cpk does not equal 1 so I'm assuming the answer is NO. doesn't the Cpk need to be 1.00 to be 99.7%?

(Ive done the calculations, I just don't know exactly what to make of them)

Thanks for any help!
 

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Bev D

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#2
The short answer: yes in your case, Cpk must be 1 or greater. Cp Is without regard to position within the spec limits. Cpk includes both the variation about the mean and the location of the mean within the spec limits...
 
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