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Date:	Thu, 27 Aug 2015 11:56:03 -0400
Message-ID:	<CAM2RGhQJtVrX0RCn5VejS5m2HJzbcSmfhGU5VrJ9LDM-JkT10A@mail.gmail.com>
Subject:	Re: [geda-user] [pcb-rnd] parametric footprint: dimensions, qf(),
	qfn() and tqfp()
From:	"Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Thu, Aug 20, 2015 at 6:42 PM,  <gedau AT igor2 DOT repo DOT hu> wrote:
> Hi all,
>
> I've implemented two major features in the parametric footprint support in
> pcb-rnd (and in the online version).
>
> The preview tool, fp2anim, can display dimensions on the annotation layer.
> This is useful for checking whether a footprint really matches the
> datasheet. Details:
> http://repo.hu/projects/pcb-rnd/devlog/20150820a_dimensions.html
>
> The more important feature is a new class of footprints. There is a low
> level, generic, but complicated to use qf() which should be able to generate
> anything that has evenly spaced pads around a rectange.
>
> There are frontends to qf(), called qfn(), tqfp() and lqfp(). These
> generators are very easy to use: they have only a few parameters, those that
> are usually specified among the first lines of a package datasheet. They
> can't handle special cases, but can safely generate any of the usual
> QFN/TFQP footprints. Details:
> http://repo.hu/projects/pcb-rnd/devlog/20150820b_qf.html
>
> The online version of the parametric footprint generator is accessible at
> http://igor2.repo.hu/cgi-bin/pcblib-param.cgi
>
> The source is in svn: svn://repo.hu/pcb-rnd/trunk/pcblib/parametric
>
> Comments, bugreports, feature requests are welcome.
>
> Regards,
>
> Igor2
>
>

Random thought. A plugin in gEDA that lets you declare a single box
with one pin as a hole of X type (M3, 4-40, etc) close or loose fit
and then defines for PCB what the dimensions should be with ether a
silk screen ring to outline of head diameter or copper under the whole
area (via).

Right now I have a set of symbols for screws and a set of footprints
but it would be cool and relatively simple to autogenerate them.

-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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