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January 1998

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Subject:
From:
Mark Simmons <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Fri, 16 Jan 1998 07:28:40 -0800
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Padmanabha Anandapuram Halappa wrote:
>
>      Good day Folks,
>
>      We face dimension problem after depanellise the v-scoring board. The
>      board's thickness is 0.062" and the v-scoring remaining thickness is
>      0.015". After depanellise, the board dimension is found to increase by
>      0.01".
>
>      According to the fab. house, this is caused by the burr (protrusion)
>      after depanelling the board.
>
>      Is there any standard spec. for the burr after depanelling the
>      v-scoring board? What is the general dimension tolerance used in
>      design the board with v-scoring?
>
>      Thanks
>
>      Robert
>
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Robert, yes, the de-paneled part will be slighly oversized.  This is a
result of a slight unevenness at the point where the board is seperated.
This oversized condition will vary slightly depending on score depth.
This usually does not present a problem because, unlike a routed edge, it
is relatively soft and will yield to pressure when fitted into a frame or
case.  If this causes problems with your application, I have a scaling
chart that should help resolve the issue.
If you are interested you can contact me directly.

hope this helps,

Mark Simmons

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