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Date: Wed, 20 Jan 2016 16:44:13 -0500
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-user] gcode
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Gene, the reason the holes are split out like that is so you can use
different size drill bits for each size hole.  You don't use mills
that small to drill holes, they'll snap, but I've drilled holes as
small as 0.013" with a CNC router successfully:
https://www.youtube.com/watch?v=SR1y6Eq19EU (which is 0.0145 but you
get the point)

What you need is something that does a drill-peck cycle for each X,Y
hole location.