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  #1  
Old 21st April 1999, 10:07 PM
ovidiomolina
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Default What are the benefits pursued with the revision of CP when Process cpk >=3?
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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Old 22nd April 1999, 04:21 PM
BILL MAYNARD
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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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Old 19th February 2001, 07:24 AM
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For a good thread on Cp, Cpk, Ppk, etc., see:
www.16949.com/ubb/Forum10/HTML/000001.html
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