James,

An afterthought, the bow and twist requirement is there to provide ease of
board population as well as end use fit. If the board is warped prior to
assembly, this indeed would affect population thus potentially making the
boards unsuitable for end use...just something to think about, or pass along
to your supplier.

Franklin

----- Original Message -----
From: "Marsico, James" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, March 14, 2002 6:48 AM
Subject: [TN] Board Bow and Twist


> I think this is a no-brainer, but here goes...  We were delivered boards
in
> panel form from one of our suppliers.  At Incoming Inspection, the panel
was
> rejected for excessive bow (>75% for SMT) and returned the supplier.  The
> supplier called me and said that even though the panel exceeded the bow
> requirement, the individual boards were acceptable.  When I quoted the bow
> and twist requirement from IPC-6012, "Panels which contain multiple
printed
> boards which are assembled on the panel and later separated shall be
> assessed in panel form." , he said yes, you measure the individual boards
in
> the panel.  I need clarification.
> Thanks,
> Jim Marsico
> Senior Engineer
> Production Engineering
> EDO Electronics Systems Group
> [log in to unmask] <mailto:[log in to unmask]>
> 631-595-5879
>
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