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  4.20 Statistical Techniques

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Author Topic:   4.20 Statistical Techniques
Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA

posted 24 September 2000 05:16 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
From: "Michaels, David J"
Subject: QS 9000: 4.20 - s.p.c
Date: Wed, 20 Sep 2000 10:48:39 -0400

Is using s.p.c. for economic reasons (savings in material usage ), as opposed to product / specification control reasons required to meet a 1.33 CpK minimum?

Specifically, our processes are component-dominant ( if the molds are manufactured correctly all produced parts produced meet spec. ) and set-up dominant ( 1st part meets spec. = all meet spec. ). We monitor part thickness on an X bar / R chart, with a goal of producing parts that are not too thick / heavy. Is this control subject to QS 9000 requirements? Thanks!

Dave M.

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J Kay
Lurker (<10 Posts)

Posts: 7
Registered: Sep 2000

posted 27 September 2000 08:41 AM     Click Here to See the Profile for J Kay   Click Here to Email J Kay     Edit/Delete Message   Reply w/Quote
It sounds like you are checking thickness as a means of monitoring process variation in your molding process that relates back to material usage. I think this would be a good example for showing compliance to Elements 4.9.2 and Element 4.2.5. Is product weight or thickness a characteristic covered within the PPAP documents?

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Forum Contributor

Posts: 13
Registered: Aug 2000

posted 26 October 2000 09:07 AM     Click Here to See the Profile for e.s.deo   Click Here to Email e.s.deo     Edit/Delete Message   Reply w/Quote
Dear Marc,
As it appears, in your case the SPC is being implemented for economic reasons and not for customers specifications.

However, as the basic intent, SPC has to be focussed in a major way on cost reduction & reduction in variations in all cases economic reasons would be the major objective of such studies.

For the sake of this question..Say
If for whatsoever reasons we have implemented SPC studies, then...

We have identified the need for SPC...

We require to implement it...

We MUST ensure that the related people are
knowledgable about the basics and ralated requirements...

We have to keep records of the study to analyse it...including the significant process events..

And so on.

And we have to have all this stuff with us!




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