I'm not aware of a standard for the protusion specifically in regards to
scoring. However, depending upon the overall board tolerance spec'd on the
fab, your supplier may be within the overall board tolerance.  Typically,
at least here at Moto, board tolerance is +/- .010 overall.  If the
scoring is putting the board out of tolerance, I would suggest designing
the board taking into account the depanelization factor and decrease the
board size accordingly. If that's not desireable, perhaps a different
scoring tool is available that will cut a narrower grove, or investigate
board routing with breakout tabs to the panel.


Steve Horvath
Staff Engineer
Motorola Inc., Radio Products Group


*******************************************************

On Fri, 16 Jan 1998, 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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