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  Statistical Techniques and 6 Sigma
  Information about PPM

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Author Topic:   Information about PPM
A.C. Mouchet
unregistered
posted 09 June 2000 04:10 AM           Edit/Delete Message   Reply w/Quote
I am looking for an historical description of the requirements of automotive principals concerning the PPM since the giving up of the AQL. Web sites, books, reviews, ... ASAP. Thank you very much.

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Marc Smith
Cheech Wizard

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From:West Chester, OH, USA
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posted 13 June 2000 01:02 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I don't know any specific sites, etc., but In my memory AQL started receeding in the late 1980's as the philosophy went from inspection to 'manufacturing responsibility'. I believe the personal computer has in part allowed this as the data necessary before could be overwhelming. In addition, the Cost of Quality started becoming 'interesting' especially as companies started trying to quantify the cost of Bad quality and had some degree of succeess. I first heard ppm in the electronics world. It might have been with respect to 6 sigma. The conversations I remember included simple stuff but most was based on the idea that there is no 'Acceptable Quality Level' (acceptable number of defects) and that serious continuous improvement was necessary. As I remember 6 ppm was a goal at many places. Damn, I've got the 'old timers' disease - can't rmember much any more.

Anyone know the equivalences between AQL and ppm? (Like an AQL of 95% is X ppm.)

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BWoods
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From:Britton, SD, USA
Registered: Mar 2000

posted 13 June 2000 03:48 PM     Click Here to See the Profile for BWoods   Click Here to Email BWoods     Edit/Delete Message   Reply w/Quote

I don't know of a way to directly link AQL to PPM. To me that is apples and oranges.

Will this help?

+/- 1sigma = 68.27% = 317,300 ppm outside
+/- 2sigma = 95.45% = 45,500 ppm
+/- 3sigma = 99.73% = 2,700 ppm
+/- 4sigma = 99.9937% = 63 ppm
+/- 5sigma = 99.999943% = 0.57 ppm
+/- 6sigma = 99.9999998% = 0.002 ppm

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Marc Smith
Cheech Wizard

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From:West Chester, OH, USA
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posted 14 June 2000 01:20 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Yup - That's what I had in mind.

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