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Date: Wed, 25 Jul 2012 17:34:16 -0400
Message-Id: <201207252134.q6PLYGZs029412@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: geda-user AT delorie DOT com
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	(message from Ram Bhamidipaty on Wed, 25 Jul 2012 14:29:55 -0700)
Subject: Re: [geda-user] how to use "clearance" and mask in pcb footprint
References: <CA+GuLwe5sPPWJQAQtX2mYTFYz5Dnt_wPy42ywZnY37dagsrEHQ AT mail DOT gmail DOT com>
	<5010D52B DOT 8030800 AT plastitar DOT com>
	<5010F048 DOT 3010304 AT plastitar DOT com> <CA+GuLwefxmvdSsYC5BwuhVhFjiffiG3LgwBU2q=+=5Zk7YwWkA AT mail DOT gmail DOT com>
Reply-To: geda-user AT delorie DOT com


Typical numbers are 8-10 mil copper clearance and 3 mil mask
clearance.

"Clearance" is the distance between the two.  A 40 mil diameter copper
pad with 3 mil mask clearance means the mask hole will be 46 mil
diameter.

http://www.delorie.com/pcb/docs/gs/gs.html#Terminology