/usr/share/pcb/m4/rules.inc is in pcb-common 20140316-3.
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#
# design rule definitions --
# tune design rules here
#
# revisions:
# Oct 12 2002 - Egil Kvaleberg <egil@kvaleberg.no>
# Initial version
#
# NOTE: The HOLE specification is the diameter of the finished hole.
# For through-hole plated PCBs, the actual drill dimension will be
# be larger. How much depends on process parameters
#
#
# pads for comopnents with thin pins (e.g TO92)
#
define(`rPAD1', 50)
define(`rHOLE1', 24)
#
# pads for components on 100mil pitch
# hole 2 for ICs etc
# hole 2c for headers etc. with square pins
#
# NOTE: rPAD2 should really be 62mil
#
define(`rPAD2', 60)
define(`rHOLE2', 28)
define(`rHOLE2c', 40)
#
# pads for larger transistors
#
define(`rPAD3', 80 )
define(`rHOLE3', 50)
#
# 3mm pads for mounting
# BUG: drill is bad
#
define(`rPAD4', 120)
define(`rHOLE4', 80)
#
# standard silkscreen line
# thin, fat, fatter
#
define(`rSILK', 10)
define(`rSILK2', 20)
define(`rSILK3', 30)
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