Re: gEDA-user: PCB pin hole size

[Daniel J Wisehart <dw@xxxxxxxxxxxxx>]

On Saturday 29 January 2005 06:08, Dan McMahill wrote:
> On Fri, Jan 28, 2005 at 04:19:23PM +0100, Wojciech Kazubski wrote:
> > > > Shold the specified diametr be the drill size or finished hole size?
> > >
> > > My fab shop says drill sized are ALWAYS finished size.  Only the fab
> > > shop knows how thick their plating is.
> >
> > So the footprint creation guide should contain a notice that:
> > 1) symbols submited to pcb should have diametr of finished holes
> > 2) if fab shop requires drill sizes, it is up to user to enlarge all
> > plated holes by specified amount.
> >
> > BTW: What sizes of holes are in use in US?
>
> see http://pcb.sourceforge.net/pcb.html#Standard-Drill-Sizes
>
> I added a big appendix to the manual which lists standard
> drill sizes.  Its only in the cvs version of the manual, not
> the last snapshot.

That is a list of all of the standard available drill sizes, which is much 
more than any board manufacturer can support.  Here is list of drill sizes 
you can use with a board built by PCBExpress: 
http://www.pcbexpress.com/technical/tool.php#drill. 

Daniel