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Subject:
From:
Jack Olson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jack Olson <[log in to unmask]>
Date:
Mon, 17 Mar 2008 08:49:06 -0500
Content-Type:
text/plain
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text/plain (96 lines)
I can't remember if I thanked you for responding,
and sorry to bother you again,
but we are taking your advice!

(THANKS!)

Can I ask one more question?

What would you consider monitoring as
"critical manufacturing parameters"?
Jack


On 2/22/08, Kathy Kuhlow <[log in to unmask]> wrote:
>
> I have done this and used the following steps:
>
> 1) QA Survey and audit confirming quality system is evident and effective.
> Also include process control of critical manufacturing parameters.
> 2) PPAP run including all critical to function dimensions and part to
> documentation/procurement agreement.
> 3) Pre-acceptance run used to qualify that the PCB will function just like
> or better than the previous part does. I typically would run 20-50 boards
> through the entire process to confirm this keeping detailed records of
> each
> process step.
> 4) Forward to customer if needed for any additional qualification testing
> and approvals.
>
> I then would maintain one of the PCB's as a historical sample with the
> reports that support the acceptance/rejection of the new supplier.
>
> Sounds painful and you can cut corners if you choose to but to me I found
> that I was asked to look at new vendors for a few main reasons:
>
> 1) purchasing got a quote with a great deal. To stop the constant
> switching
> and maintain better suppliers the process to change shouldn't be a simple
> cake walk or you may find yourself constantly jumping depending on the new
> suppliers delivering lower costs.
> 2) to make the initial decision have more weight and to provide a
> motivation
> to be better at original sourcing and not just run around for cost
> savings.
>
> Kat
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Friday, February 22, 2008 9:00 AM
> To: [log in to unmask]
> Subject: [TN] FAB Vendor Verification? Validation?
>
> FAB: Vendor Verification? Validation?
>
> It seems like I have leaned on Technet too often lately,
> and I hope I'm not wearing out my welcome....
>
> ...but I am having to address this question:
> "If you switch bare board manufacturers, what should you
> do to verify that the new boards are just as good or better
> than the old ones were?"
>
> I can say a lot about how to CHOOSE a bare board vendor
> and how to SPECIFY minimum levels of acceptability, but
> from a technical point of view, is there more that should be
> done than typical visual inspection, dimensional checks and
> cross sections of the boards themselves?
>
> Do any of you periodically monitor your bare board vendor
> by asking for process control reports and stuff like that?
>
> Have any of you ever been asked to re-validate a product
> (reliability testing) on products just for changing the bare
> board vendor?
>
> Maybe I have just had a fortunate career by always getting
> good boards, but lately I've been stung a few times in this
> brave new world.
>
> have a good day,
> Jack
>
>
>

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