Regarding bow/twist for arrays, prior to separation, the array is considered
a board and subject to the bow/twist requirements of 6012.
At least this is how I interpret it, and apply it in my shop.
Regards,
Franklin D Asbell
Network Circuits, Inc.
Irving, Texas 75061
----- 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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