One Kyu Son would it be possible to get an example of the L-Cut you are
talking about? I am putting a paper together for the upcoming IPC
conference it this would be good inf. to be incorporated.

Thanks.

Steve Collins
Antec Corporation

----------
> From: CSS International Corp. <[log in to unmask]>
> To: [log in to unmask]
> Subject: Re: [TN] BURR
> Date: Friday, January 16, 1998 1:53 PM
>
> There are many ways you can try to control this process.
>
> First is to change the design to do more routing in the critical
dimension
> areas and then use the scoring (either L-Cut or V-Cut).
>
> Second is to use L-Cut (instead of V-Cut) as this will give you better
> control on your burr dimension.  And have a tight tolerance for the upper
> and lower side offset.  And minimized the web thickness as much as
possible
> without breaking them during component mounting.
>
> Third, you can use a side grinding machine to automatically sand the
edges
> if you do not have a dust problem.  We have a unit we built by ourselves
> which works very nicely.
>
> The dimension changes due to burr will depend on each type of board (due
to
> glass size and structure) you are talking about as well as how you
> depanelize the boards.  We did an extensive study with our customer about
> five years ago.  To get the exact record it will take too much time.
>
> We hope this helps a little.
>
>
> Best Regards,
> One Kyu Son
>
>
>
> At 05:39 PM 1/16/98 +0000, you 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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