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Date: Mon, 24 Feb 2014 10:01:28 +0100
From: Gabriel Paubert <paubert AT iram DOT es>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Smallest clearance and mask in pcb
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On Mon, Feb 24, 2014 at 08:51:31AM +0100, Gabriel Paubert wrote:
> On Sun, Feb 23, 2014 at 04:41:40PM -0500, DJ Delorie wrote:
> > 
> > I typically leave 3mil between mask and copper.  "clearance" is
> > copper-copper so should be the same as the line/space rules (typically
> > 6-10mil).

Sorry I read the message too fast and should have created another thread
for this problem.

But I concur with DJ, I typically use 75µm (~3mil) for solder mask cleareance,
although I had to go below (down to 60µm] for some 0.5mm pitch devices in a board 
which was fabricated earlier this month. But whether you can do it or not
depends on your PCB house (in the first version the solder mask apertures
were merged).

	Gabriel