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
