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Re: gEDA-user: PCB mounting holes for metric screws

On Tue, 16 Oct 2007 21:15:13 +0000, Michael Sokolov wrote:

> But what about the copper annulus?  What would be a good copper annulus
> for those screw-accommodating holes?

None :-)
pcb calls these holes "unplated" and produces a separate gerber file for 
them.

See below the footprint I use for M3 screws. Polygons and solder mask 
will keep proper distance. I think, I derived this footprint from one of 
John Lucianis hex standoffs.

/-----------------------------
Element["" "hole-M3" "" "" 12500 12500 -16900 -21000 0 100 ""]
(
	Pin[0 0 12500 14200 22700 12500 "" "1" "hole"]
	ElementArc [0 0 12000 12000 0 360 1000]
	ElementArc [0 0 6800 6800 0 360 1000]

	)
\----------------------------

---<(kaimartin)>---
-- 
Kai-Martin Knaak                                  tel: +49-511-762-2895
Universität Hannover, Inst. für Quantenoptik      fax: +49-511-762-2211	
Welfengarten 1, 30167 Hannover           http://www.iqo.uni-hannover.de
GPG key:    http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmk&op=get



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