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Date: Sat, 28 Apr 2012 02:13:21 -0700
Message-ID: <CAN0Jx-9QTve=tZJ5XwFGfXsWu9EfTwtdzYEXi7G3bLGLBkZ2qw@mail.gmail.com>
Subject: Re: [geda-user] board fab
From: Russell Dill <Russ DOT Dill AT asu DOT edu>
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On Fri, Apr 27, 2012 at 6:18 PM, Bob Paddock <bob DOT paddock AT gmail DOT com> wrote:
>> The boards are tab routed, so edges will have a
>> rough spot where a tab is broken off.
>
> If you can specify where the tabs are going (easy if your doing your
> own panel layout, not so easy with a board service),
> and you can make some space at the edge of the board where the tab is
> located, you can get clean tabs:
>
> Specify a series of very small drill holes, whatever the smallest
> drill the service has, that are as close together as allowed.  The
> drill hit is then centered
> on what would be the edge of the board.  This puts half of the drill
> hit into the board, and half of the drill hit into the tab.  These are
> not plated holes,
> which is a problem with some places.  If it is done correctly there is
> no clean up work.
>
> Caveat with any tab work: Study where the stress goes when the tab is broken.
> Putting things like ceramic caps or crystals next to the tab will
> result in fractured parts.
> If it is a bypass cap the damage is not always immediately obvious.


http://blogs.mentor.com/tom-hausherr/blog/2011/06/23/pcb-design-perfection-starts-in-the-cad-library-part-19/