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Date: Mon, 31 Aug 2015 07:50:13 +0200 (CEST)
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To: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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From: gedau AT igor2 DOT repo DOT hu
Subject: [geda-user] [pcb-rnd] parametric footprint screw() (was: Re: [pcb-rnd] parametric
 footprint: dimensions, qf(), qfn() and tqfp())
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Hi all,

using the example static footprints and the metric side of the table sent 
by Evan, I've implemented the first version of the screw() footprint. It 
has two modes of operation:

1. specify all dimensions by hand (watch out: default unit is mil for 
all scripts!), e.g. screw(3mm, 6mm)

2. specify the name of a standard screw and optionally specify the type of 
the head, e.g. screw(M3, cheese); to select the close fit hole, use 
M3:tight or M3:close-fit

Furthermore there are optional silk layer head shape drawings for a few 
common shapes and slots, such as plain slot, hex, philips, torx. They can 
be combined.

Examples:

http://igor2.repo.hu/cgi-bin/pcblib-param.cgi?cmd=screw%28M3%29%0D%0A&mm=1&dimname=1&dimvalue=1
http://igor2.repo.hu/cgi-bin/pcblib-param.cgi?cmd=screw%28M3%3Atight%2C+cheese%2C+shape%3Dcircle%3Ahex%29%0D%0A&mm=1&dimname=1&dimvalue=1
http://igor2.repo.hu/cgi-bin/pcblib-param.cgi?cmd=screw%282.5mm%2C+5.52mm%2C+tx%3Acircle%2C+8.1mm%29%0D%0A&mm=1&dimname=1&dimvalue=1

Reference:
http://igor2.repo.hu/cgi-bin/pcblib-param.cgi?cmd=screw&output=help

Regards,

Igor2