Re: gEDA-user: PCB pin hole size

[Walter Fetter Lages <w.fetter@xxxxxxxx>]

Wojciech Kazubski wrote:
>   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

	OK, but I think that it would be better to have the footprints with 
correct size holes and leting PCB create a drilling mask file, with 
crosses at hole centers.

--
[ ]'s
Walter Fetter Lages       <mailto:w.fetter@xxxxxxxx>
<http://www.eletro.ufrgs.br/~fetter>