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January 1998

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Subject:
From:
"Dhawan, Ashok" <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Mon, 19 Jan 1998 07:43:39 -0700
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text/plain (166 lines)
Kyu Son
Is L-cut same as tab ou u-cut?

shall appreciate clarification on this. We were doing sanding to file
out extra tab material  and burrs on v-scores.


[log in to unmask]


> ----------
> From:         Steve Collins[SMTP:[log in to unmask]]
> Sent:         January 19, 1998 8:17 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] BURR
>
> 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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