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 _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user