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Subject:	Re: V-score Clearance
From:	John Parsons <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 1 Mar 2001 15:05:25 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (48 lines)

Jorge,

Certainly 0.025" is a nice number if you are lucky enough to get it,
we always quote that clearance if we are asked when a board is
still at the design stage.  Aside from that you just have to do the
math.  The width at the top of the cut will be a fixed number for a
given depth and blade angle.  Add to that a comfortable tolerance,
say 0.005" and use that as a rock bottom minimum to avoid
nicking features.

Regards
John Parsons
Circuit Graphics Ltd.

> Technetters,
>
>                 I need help on a v-score issue that's hitting us right now.
> What's the minimum acceptable clearance area from the v-score edge to board
> traces and pads?. The product we are having problems with has exposed copper
> on some traces and pads that are too close to board edge and v-score edge,
> this is down to 6 mils on some pads. I am trying to recommend the customer a
> reduction of pads and relocation of traces to a minimum distance from board
> edge. Recommendations?. This is a product where the board size cannot be
> increased to solve the problem, so we're pretty much constraint to pad
> reduction and relocation of vias? Any ideas on what's the minimum distance?,
> is there an IPC standard for issues like this?
>
>
>
>         Any comments would be appreciated
>
>
> Jorge Rodriguez
> Process Engineer
> Varian Electronics Manufacturing
> Tempe, AZ
> E-mail: [log in to unmask]

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