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Cp and Cpk can be more than 2?


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process capability, cpk (related to process capability)
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  Post Number #1  
Old 3rd August 2011, 06:15 AM
berseak

 
 
Total Posts: 83
Question Cp and Cpk can be more than 2?

I unclear this concept.
Today when manager meeting. Each production section present about Cp and cpk. line A cp = 7 Cpk = 6.5 etc.

What is the ture about cp, cpk.

THank you.

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  Post Number #2  
Old 3rd August 2011, 06:23 AM
Barbara B's Avatar
Barbara B

 
 
Total Posts: 390
Re: Cp and Cpk can over than 2?

Please take a look into the thread Process Capability - Understanding what Process Capability Indices mean and the Elsmar Cove Wiki Process Capability Index and the concepts, interpretations and pitfalls of process capability indices will become clearer.

Regards,

Barbara
Thanks to Barbara B for your informative Post and/or Attachment!
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  Post Number #3  
Old 3rd August 2011, 11:42 PM
milind dhakad

 
 
Total Posts: 27
Re: Cp and Cpk can be more than 2?

Dear Friend ,
Yes it is possible to have Cp 7 and cpk 6'5. It is possible when the specified tolerance is very large compair to your process variation
like your need tolerance on hole as +/_2 mm and using CNC machine for that with accuracy in Micron then it is possible
On second side pls check the rejection PPM and use of CP & cpk ,6 sigma level and rejection ratio , If not matching means data is not okay

THis is my explanation only ,we will wait for other expertise comment on it
Thank You to milind dhakad for your informative Post and/or Attachment!
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