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

["Bert Timmerman" <bert.timmerman@xxxxxxxxx>]

Hi Michael,

Have a look at:

http://www.pcblibraries.com/downloads/files/Mounting%20Holes.zip 

I have already drawn some of them as pcb footprints (MTG300_*.fp ..
MTG470_*.fp).

If you want them, just say yes.

Kind regards,

Bert Timmerman


-----Oorspronkelijk bericht-----
Van: geda-user-bounces@xxxxxxxxxxxxxx
[mailto:geda-user-bounces@xxxxxxxxxxxxxx] Namens Michael Sokolov
Verzonden: dinsdag 16 oktober 2007 23:15
Aan: geda-user@xxxxxxxxxxxxxx
Onderwerp: gEDA-user: PCB mounting holes for metric screws

Hello fellow gEDA/pcb users,

I've got a PCB mechanical design question.  I have given up on the idea of
copying the form factor of EN routers (basically I don't really like that
form factor) and I'm going for a form factor of my own.  However, being a
proud citizen of the Union of Soviet Socialist Republics, I want to make my
form factor all metric -- the Soviet national standards body required that
for all new designs and my own sense of taste does the same. :-)

I've speced my board dimensions in metric (130x165 mm) and I'll have
mounting holes for metric screws, some M3 and some M4.  My question is about
the latter:

I've been told that the drill diameter should be 3.1 mm for an
M3-accommodating PCB hole and 4.2 mm for an M4-accommodating one; is this
correct?

But what about the copper annulus?  What would be a good copper annulus for
those screw-accommodating holes?  Assume the "typical" kind of screw used to
secure PCBs to enclosures.

TIA,
MS


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