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  Statistical Techniques and 6 Sigma
  Unilateral Tolerance Capability

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Author Topic:   Unilateral Tolerance Capability
Al Dyer
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Posts: 622
From:Lapeer, MI USA
Registered: Oct 2000

posted 29 November 2000 04:28 PM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote
Does anyone have some ideas on which capability index (s) should be used when monitoring runout on a shaft with a unilateral?

ASD...

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Al Dyer
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sbnorris
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posted 06 December 2000 08:03 AM           Edit/Delete Message   Reply w/Quote
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.

quote:
Originally posted by Al Dyer:
Does anyone have some ideas on which capability index (s) should be used when monitoring runout on a shaft with a unilateral?

ASD...


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Don Watt
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Posts: 70
From:Notts,United Kingdom
Registered: Mar 2000

posted 06 December 2000 08:33 AM     Click Here to See the Profile for Don Watt   Click Here to Email Don Watt     Edit/Delete Message   Reply w/Quote
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 ?

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