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Date: Fri, 23 Mar 2012 16:58:30 -0700
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Solder paste/nopaste flag overlapping, and custom
 paste apertures
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On Fri, 23 Mar 2012 19:07:52 -0400
DJ Delorie <dj AT delorie DOT com> wrote:

> 
> The centerpad of one of my chips looks like this:
> 
> 	Pad[3937 3937 3937 3937 1968 2000 2568 "" "EP" "edge2"]
> 	Pad[0 3937 0 3937 1968 2000 2568 "" "EP" ""]
> 	Pad[-3937 3937 -3937 3937 1968 2000 2568 "" "EP" ""]
> 	Pad[3937 0 3937 0 1968 2000 2568 "" "EP" "edge2"]
> 	Pad[-3937 0 -3937 0 1968 2000 2568 "" "EP" ""]
> 	Pad[3937 -3937 3937 -3937 1968 2000 2568 "" "EP" "edge2"]
> 	Pad[0 -3937 0 -3937 1968 2000 2568 "" "EP" ""]
> 	Pad[-3937 -3937 -3937 -3937 1968 2000 2568 "" "EP" ""]
> 	Pad[0 0 0 0 1968 2000 2568 "" "EP" ""]
> 	Pad[0 0 0 0 11811 2000 0 "" "EP" "square,nopaste"]
> 
> That's nine paste dots on a solid copper pad

How has that been working for you?  Good yield on your boards? 
I read an article somewhere that described a modification of this
where the QFN exposed pad is actually segmented by solder mask as
well as the paste stencil -- this keeps the solder evenly
distributed even if the chip tries to tilt a bit.  My attempt at
this is attached for reference.

> However, in your footprint, you set the solder *mask* to zero,
> which covered the pad, and shrunk the valid paste size to zero
> also.

Doh!  I did just figure that out a few minutes ago by reading the
pcb source code (note to self: always RTFS!!).
Thanks for the info.

Regards,
Colin

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