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March 2002

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Subject:
From:
"Marsico, James" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 14 Mar 2002 08:12:27 -0500
Content-Type:
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text/plain (102 lines)
Well, I got two responses with two different interpretations...

Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>
631-595-5879


        -----Original Message-----
        From:   Franklin D Asbell [SMTP:[log in to unmask]]
        Sent:   Thursday, March 14, 2002 8:17 AM
        To:     TechNet E-Mail Forum.; Marsico, James
        Subject:        Re:      [TN] Board Bow and Twist

        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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