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July 1998

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Subject:
From:
Chris_Smith <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 16 Jul 1998 13:39:11 -0500
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     All,
        I have a lead trim operation that uses a Q-corporation LOM II
     trimming system with a vacuum fixture.  We are using the standard
     cutting rings with a 30 degree angle.  The Vacuum fixture being used
     is quite snug and there is very little vacuum loss in the process.
        The issue I have is the height requirement we're trying to meet is
     .020" max length.  This strict requirement is resulting in pcbs being
     cut into and damaged, some flagging, and some solder fractures.  This
     seems to be a very operator dependent operation and costly if not done
     correctly.  I have tried varying the speed the cutter is moved across
     the board, having Q-corp sharpen the blades instead of us doing it and
     using a QB-1 PCB brusher which was purchased for this product.
        Is there anyone out there with a similar trim height requirement
     and what types of things do you perform to insure a repeatable
     process?  Also anyone with suggestions please let me, I need to get
     this resolved if at all possible.

     Thanks
     Chris Smith
     Manufacturing Engineer

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