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  Processes with cpk >=3

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Author Topic:   Processes with cpk >=3
Forum Contributor

Posts: 11
From:Monterrey, Nuevo Le—n, Mˇxico

posted 21 April 1999 08:07 PM     Click Here to See the Profile for ovidiomolina   Click Here to Email ovidiomolina     Edit/Delete Message   Reply w/Quote
What are the benefits pursued with the revision of control plans when our process shows high values of cpk (>=3), as is suggested in point 4.9.2 Maintaining Process Control ?

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Posts: 13
From:Parrish, Fl USA
Registered: Dec 98

posted 22 April 1999 02:21 PM     Click Here to See the Profile for BILL MAYNARD   Click Here to Email BILL MAYNARD     Edit/Delete Message   Reply w/Quote
What is your Ppk?
With the Cpk at 3.0 it shows the process to be stable & centered. Your charts probably shows the contol limits spread are probably around 20% of the Tolerance.
Benefits for changes. Decrease inspection frequency for labor costs. Just make sure that the output that has Cpk >3.0 runs at the 20% level of Tol.

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA

posted 19 February 2001 06:24 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
For a good thread on Cp, Cpk, Ppk, etc., see:

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