Design of Lot Acceptance Sampling Plan - Zero Acceptance Number Sampling Plans

K

Karen Whitehead

#11
I don't know that song. Can you hum a few bars? ;)
Ah - Perhaps you're not Country?? Tanya Tucker "When you walked in I shoulda walked out - Well it's a little too late to do the right thing now." I'm from Tennessee, so it's in my genes. I see you are from Utah. Beautiful territory. I'm a horseback rider & visited Southern Utah last year. Rode in the Red Canyon. BEAUTIFUL.
 
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J

Jeff Frost

#13
Karen

Just to add a little more information to this discussion. Nicholas L. Sequeglia has written a book called "Zero Acceptance Number Sampling Plans" which may be helpful.
 

Mike S.

Happy to be Alive
Trusted Information Resource
#16
This is exactly how we are proceeding. Quality might make a call for more sampling - Engineering may have to make a call - Lot could be rejected - Etc., Etc., Etc.
All of that is fine unless you're sampling parts for shipment to an aerospace customer, in which case you cannot approve a lot with known defects relative to the customer requirements.
 
K

Karen Whitehead

#17
All of that is fine unless you're sampling parts for shipment to an aerospace customer, in which case you cannot approve a lot with known defects relative to the customer requirements.
That is why one of the decisions would be "rejection." I assume that any supplier dealing with the aerospace industry certainly has the cost of quality calculated correctly in the price of his product. I would also think that the criticality of the product to the safety of the consumer (aerospace, medical industry, etc.) affects inspection decisions. I hope we have the good sense to properly take the criticality of the defect into consideration.

I appreciate your comment. :thanks:
 

Mike S.

Happy to be Alive
Trusted Information Resource
#18
That is why one of the decisions would be "rejection." I assume that any supplier dealing with the aerospace industry certainly has the cost of quality calculated correctly in the price of his product. I would also think that the criticality of the product to the safety of the consumer (aerospace, medical industry, etc.) affects inspection decisions. I hope we have the good sense to properly take the criticality of the defect into consideration.

I appreciate your comment. :thanks:
Karen,

I hope my post did not appear condescending to you. That wasn’t my intent.

I haven’t been around the Cove for awhile and I don’t know the newer posters very well, but I know for sure there are some folks out there with “Inspector”, “Quality Manager”, “Quality Engineer” etc. in their title who have very little understanding of sampling plans or quality fundamentals in general. I guess my post was just a general statement to anyone who may be new to C=0 plans.

Maybe this is the wrong thread to say this in, if so, Mods feel free to move it. I think one of the mistakes that I too often repeat as a quality practitioner is assuming a certain level of competence in the suppliers I deal with. I know that may sound egotistical but that’s not my intent. There are many folks I have “met” here on the Cove who are no doubt far superior QE’s and QM’s than I, but I can tell ya not too many of them seem to work for my suppliers – who are aerospace suppliers! Wow, it boggles my mind sometimes.

I don’t expect everyone to be a genius or quality guru, just understand the basics for the title you have. I don’t personally give a hoot about ASQ certifications, they’re too much like ISO certifications. But somehow, some way, employers should be putting better people in the Quality positions in their company. They’ve gotta vet these people better, assuming they care. I just too often see folks who are in waaaay over their head in important Quality positions, and it upsets me.

Rant over.

Peace!
 
K

Karen Whitehead

#19
I did not take it that way. I appreciate any input I get from this forum. It is very helpful.

:bigwave:
 
J

Jeff Frost

#20
Actually the easiest way to assure the product is acceptable to your customer is to implement the following low cost method known as MIL-TP-41 (Make It Like The Print For Once) throughout your processes.

It costs no more to make it right the first time then to find nonconformities requiring rework of the product or worst case having to remake it.
 
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