Re: gEDA-user: PCB pin hole size

[Wojciech Kazubski <wk@xxxxxxxxxxxxx>]

  Hello.
>
>  There are many PCB libraries (m4 style) where components have pin hole
> size=20 mil. This is too small for typical pin-through-hole components,
> isn't it? Would 28 or 35 mil holes be better, or am I missing something
> here?

I think that 20mils hole was used to serve as drill guide for manual drilling. 
Even today it is usefull for fast prototyping of simple single sided 
circuits, there are some technologies that allow making pcb from laser 
printout in half an hour or so.
It would be better to make holes right size in footprint, but the option to 
reduce all holes on postscript printout would be still usefull (at least for 
some hobbyist). It should not be hard to implement.

Wojciech Kazubski