Allrightythen..... In a perfect world, all this works, however, we live and
work in an imperfect world! So, from my imperfect world experiences, here's
my reality...
What if:
you are not in the commercial market, and
there are few companies capable of manufacturing your designs, and
the design specifications are required for the end product, and
it's a specialty product, so it is not IBM or Cisco volumes, hence your
vendor pool is small, and
the supplier has not been able to meet the yields they initially projected
for such designs, and
then on top of all that...it's flex...
A design can only be tweaked (real word? spelling?) or DFM'd within the
required technology design limits. If we designed for 100% yield, we could
not build the products. I think that's real life for many people. We
accept, and the manufacturer accepts, that the product yield will be greatly
less than 100%. Okay, that's life with these products.
So, then we go back to the basic question(s), what is reasonable to expect
at incoming - a)100% good product in the door, b) perform an AQL, c) perform
100% inspection, or d)other...?
Perhaps something you've been saying has more impact than I realize, as I
think about it - contract negotiations. If the supplier signs up to meet
design/product criteria and doesn't, my options are:
a)change suppliers,
b)if a is not possible, negotiate incremental improvements with the goal of
meeting the specifications?
At what point/product type/product complexity does expecting the supplier to
provide 100% good parts fail or become unreasonable?
Just food for thought,
Jana Carraway
-----Original Message-----
From: Earl Moon [mailto:[log in to unmask]]
Sent: Thursday, January 03, 2002 10:29 AM
To: [log in to unmask]; Jana Carraway
Subject: Re: Final Audit/Inspection
Jana,
I've really missed our interesting conversations. You know how I feel about
incoming inspections. I needn't repeat they should be abandoned entirely.
You know how I feel about DFM/CE and the highly manufacturable designs that
should come from their processes. You also know that I revere good supplier
evaluation and qualification processes and procedures. Hell, is there anyone
who doesn't know how I feel and does it matter?
In the good old days, besides the other MIL documents I've discussed, there
was another named MIL-I-45208. When a supplier couldn't conform to some
other requirements assuring process control was being effected, some
customers allowed inspections to be performed.
In all cases, inspections performed - whether at incoming, in process, or at
final - required results to be correlated with customer contract
requirements as drawings and/or specifications. Again, in all cases, when
defects were found, exceeding acceptance criteria, corrective action was
required. Sound familiar - as in ISO 9000? Anyway, if corrective action
yielded defects, contracts were cancelled at some point.
Customer incoming inspections could be used to find defect, but it was
highly desirable, to continue good supplier/customer relations, that they
were caught at least at final. Another inspection technique was using source
inspectors at the supplier site to assist in finding defect or approving
specified quality. You may think in these terms.
But, as Daan has said, and everyone in the free world knows, you can't
inspect quality into product. In this light, how much abuse does one have to
endure before something affecting adverse quality is done. Do you change the
design, process, or both? It's up to the customer and when the right
decision is made, life is better as quality improves.
MIL-Q-9858A (another AAAAAA) is available in the paper back version
(actually .pdf) from you local SITNET dealer. It's just for interest's sake.
Enjoy Jana,
Earl
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