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	Sun, 15 Jan 2017 01:26:01 -0800 (PST)
Date:	Sun, 15 Jan 2017 10:25:58 +0100
From:	"Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] thru hole slots in PCB --> excellon drill file
	format
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> > > > Even though board is defined as a solid shape as a real board is it
> > > > may still of course make sense to show only outline, maybe even in
> > > > gerber. It is claimed here https://sourceforge.net/p/gerbv/feature-re
> > > > quests/89/ G85 is used to define slots in Excellon drill file but for
> > > > CNC g-code is a boring cycle which I am not totally sure what it do.
> >
> 
> G85 is Excellon.  Not sure how g-code got into the discussion.

g-code is used for CNC machines so I guess they got the code from there but today I found the excellon drill file format.

> > > I have used an approach of putting two vias in pcb, then changing the
> > > drill file to add route commands (using M15/M16 IIRC) between those
> > > vias. I also found and refactored a patch for gerbv to support viewing
> > > of this.
> >
> 
> The latest gerbv supports G85 slots, but doesn't seem to support M15/M16.

I found excellon drill file format and now I understand. For cnc it is used a little bit different which is confusing.

https://en.wikipedia.org/wiki/Excellon_format
https://web.archive.org/web/20071030075236/http://www.excellon.com/manuals/program.htm

> Erich pointed out my script to generate slots:
> 
>   https://github.com/hackvana/eagle-plated-slots/
> 
> Basically the idea is that if you want plated slots, you put two plated
> drills of a specially chosen diameter at either end of the slot, ie, the
> diameter is a magic value you only use for the slot end holes.  My script
> takes pairs of holes with that magic diameter, and turns them into a G85
> slot.  It relies on the two holes being one after the other in the file.
> That's true for Eagle, and may be true for gEDA.

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