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This thread is carried over and continued in the Current Elsmar Cove Forums
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The New Elsmar Cove Forums
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 The New Elsmar Cove Forums
 Statistical Techniques and 6 Sigma
 Unilateral Tolerance Capability
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| Author | Topic: Unilateral Tolerance Capability |
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Al Dyer Forum Wizard Posts: 622 |
posted 29 November 2000 04:28 PM
   
Does anyone have some ideas on which capability index (s) should be used when monitoring runout on a shaft with a unilateral? ASD... ------------------ IP: Logged |
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sbnorris unregistered |
posted 06 December 2000 08:03 AM
Al: I have run into the same question. I think using (mean+3s)divided by the allowable tolerance is a valid way of expressing the capability of such a process. But I am not sure if this a valid approach.
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Don Watt Forum Contributor Posts: 70 |
posted 06 December 2000 08:33 AM
Hi Al, I tend to use PpU / CpU ; (Upper spec limit - double bar X) divided by 3 sigma to give capability of making parts within maximum tolerance. Does anybody know if there is a "target figure" for this index, e.g. Cpk >1.33 / Ppk >1.67 ? IP: Logged |
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