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Date: Thu, 25 Jun 2015 12:51:52 -0400
Message-Id: <201506251651.t5PGpqmO020374@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: geda-user AT delorie DOT com
In-reply-to: <20150625163731.GA18117@visitor2.iram.es> (geda-user@delorie.com)
Subject: Re: [geda-user] [RFC][PATCH] PCB: Allow non rounded clearances for
 rectangular/square pins and pads
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Not that I'm discouraging the patch (options are always good) but this
is why we don't do square clearance by default:

http://www.delorie.com/pcb/notches.html

Just something to keep in mind :-)

IIRC I talked with a pcb fab "insider" at the time and he agreed that
square clearances made sense for the mask (where X and Y alignments
were independent) but round clearances were OK for copper (where the
problem is etching, not X and Y alignment).