Under the previous QS-9000 revision (2nd) our company applied the Chrysler 'Lot Inspection Sampling Table' to inprocess and final (outgoing) inspection, and since we test all product 100% we felt we adequately met this requirement. We did not, however, apply this table to Receiving Inspection, chossing our own sample size based upon supplier performance and C=0. Now Chrysler's PSO requirement is spelled out in QS-9000 (3rd edition)& PSO clearly states in section 6) Incoming & Outgoing Material Qualification/Certfication Plan that the sampling table applies. This will impose a huge burden on RI at a time when our customers are pushing to REDUCE RI, not increase that activity. Any thoughts?

Have you spoken with your Chrysler rep about it yet?

It is Chrysler SQA who is stating this requirement. In the past, Chrysler accepted the sampling plan as applying to outgoing product inspection only. Now SQA is imposing the PSO manual and its Chysler-established sampling plan for RI in lieu of our previous established quality system procedure. As I see it, the danger of a customer imposed sampling plan is that with multiple customers, a company could conceivably have multiple sampling plan requirements. Many of our parts are interchangeable, regardless of customer. In the past we based our RI sampling on supplier delivered product. Inspecting 125-200 o-rings or stampings because the sampling plan chart requires it is not cost effective.

No one commented on this when posted last November. Anyone have any comments now that some of the 3rd edition issues have been addressed?

This is kinda the same subject, but different topic.
We use three pieces for setup inspection and in-process checks
The auditor states we shall determine why 3 pcs. is a statistcally sound sampling plan or use 4 or 5 samples instead. The QS SPC book does not state what makes 4 or 5 pieces statistically sound-it just states to use it. How do I determine 3 pieces, 4 or 5 are statistically sound? OC curves and the like are only confusing me.

Can anybody provide some answers on the question of sampling methods. How to establish the minimum amount of sample to be collected and establish a viable sample plan?
Thanks.

You might want to start with a copy of MIL-STD-105. You can find a copy here:
http://stinet.dtic.mil/

good luck!

CarolX

Chrysler 'Lot Inspection Sampling Table' to inprocess and final (outgoing) inspection, where would I get a copy of that? I need a smaping plan after 100% verification of sorted work. If I use C=o I dont have any AQL level just they donot want any defects.We are trying to get Q-9000 registered.

My company is QS 900 certificate, in my last audit, our auditor said we have to use acceptance sampling plan for zero defects from our suppliers. So far, we use sampling plan according to ANSI/ASQ Z1.4, does anyone knows something better?

The requirement is that the acceptance criteria for attribute sampling is zero defects. There is no requirement to use a specified sampling plan. You can make up your own as long as it satisfies your needs.
Your sampling plan should simply state "reject the lot when a defect is found".

Ayala,

The funny thing is that there is no legitimate zero defect sampling plan. The best that can be done with 100% inspection is not 100% (sorry for the quality cliché) effective. One thing to do is just what Sam mentioned. Use the same table from the ANSI standard and change it to a rejection on one defect. There are also some sampling plans available on the OEM’s websites. Sorry, I don’t have a link to give you but I know Chrysler and GM both have such a plan. Once again, it just a semantic difference.


Monte

Ayala,

You could look at Zero Acceptance Number Sampling Plans, Fourth Edition by Nicholas L. Squeglia; or MIL-STD-105E; both based on C=0.

If you do a Google search you should be able to locate vendors of either of these documents. The book by Squeglia shouldn't run you more that $20-$25.

FYI, you can download the Military Standards (414 and 105E) free here (http://www.variation.com/techlib/standard.html) in PDF format. These have both been cancelled due to the fact that the ANSI/ASQ standards are essentially identical. Here's an explanation I found about the differences between 105E and Z1.4:

What are the differences between MIL-STD-105E and ANSI/ASQ-Z1.4?
ANSI/ASQ Z1.4 (1993) is nearly identical to Mil-Std-105E. There are no changes in the tables of sampling plans. The only change in the switching rules is that ANSI Z1.4 makes the use of the limit numbers for switching to reduced optional. In addition, ANSI/ASQ-Z1.4 contains additional OC curves called scheme OC curves that describe the protection provided by the switching procedure during periods of constant quality. Numerous changes where also made to the explanatory text but which do not affect any procedures.

I tried the link that howste provided but got an error, so I did a quick search and am attaching a link to MIL-STD-105E.

http://tldsymposium.nukeworker.net/PDF/STD_105D1.pdf

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