X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
Date:	Sun, 06 Jul 2014 16:41:27 +1200
From:	Lilith Bryant <dark141 AT gmail DOT com>
Subject:	Re: [geda-user] pour clearing around pads
To:	geda-user AT delorie DOT com
In-Reply-To:	<53B8CC66.2080909@sonic.net> (from davecurtis@sonic.net on Sun
	Jul 6 16:11:18 2014)
X-Mailer:	Balsa 2.5.1-79-g9697477
Message-Id:	<1404621687.750.40@zotlet.(none)>
MIME-Version:	1.0
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id s664fsKD027191
Reply-To:	geda-user AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
X-Mailing-List:	geda-user AT delorie DOT com
X-Unsubscribes-To:	listserv AT delorie DOT com

On 2014-07-06 04:11:18 PM, Dave Curtis wrote:
> I'm working on a footprint where if I follow the data-sheet geometry and 
> my normal design rules, I end up with a footprint where very skinny 
> copper peninsulas sneak between pads when it is placed in a polygon.  
> The peninsulas neck down to less than the minimum copper width rule.
> 
> So, first off, I'm surprised that the Cu polygon allows Cu to pour into 
> a space less than the minimum width rule.
> 
> Secondly, I'm wondering if fab houses might flag that as a DRC violation 
> even if pcb doesn't.
> 

I have had a fab house complain about this.  I ended up telling them to just 
ignore it, and so far it hasn't been an issue but it does make me a little nervous,
particularly what might happen to fine slivers that get undercut during etching.

Also, I don't do RF stuff, so ending up with unconnected islands is not a issue for
me.

I have been meaning to write a polygon "bake" tool that fixes this, but have 
been put off by the lack of a workable polygon library.   Pretty much just needs 
to erode then dilate by the minimum clearance.    Was going to use shapely/GEOS 
in python, but it's erosion doesn't seem to work :(   So it went into the too hard
basket for the time being.    

- Raw text -