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Date: Thu, 29 Dec 2011 09:03:53 +1100
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Subject: Re: [geda-user] pcb slots
From: Stephen Ecob <stephen DOT ecob AT sioi DOT com DOT au>
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On Wed, Dec 28, 2011 at 7:54 PM, Link <link AT penguindevelopment DOT org> wrote:

> If you're willing to go with kludges like that, another way might be to
> place some holes as close to one another as the board house will accept, in
> a sort of perforation line (so there's just a small sliver of board between
> each pair of holes), and then chisel that line into a slot yourself with a
> small flat-headed jewellers' screwdriver.

Some fabs allow overlapping drill hits, possibly only for larger
holes.  At ~0.2mm the drill bits snap quickly, but at > 1mm they can
often tolerate it.
gEDA PCB  allows overlapping holes - it won't let you place one hole
atop another, but you can drag a hole so that it overlaps another.
It's definitely worth talking to your fab to see whether they can work
with this approach.

-- 
Stephen Ecob
Silicon On Inspiration
Sydney Australia
www.sioi.com.au