Hi Jack,

I would go for a two step approach.
First I would check with my vendor what are the critical parameters on his side. So ask him to perform a FMEA to identify the critical parameters in his line. Then ask for the performance data on these critical inputs. Most propably you will get SPC data with a certain confidence level. With this you will get already a good overview how repeatable his quality will be in future.
Second I would do a FMEA on my assembly line to find out the critical parameters from there.
All together you will know on what to focus on and what to specify. These data are very good to compare different vendor.
How does it sounds to you?
Ralph

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Monday, March 17, 2008 2:49 PM
To: [log in to unmask]
Subject: Re: [TN] FAB Vendor Verification? Validation?

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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