On Sun, Jan 30, 2005 at 01:14:15PM -0800, Daniel J Wisehart wrote: > 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. Of course its much more than you'd want to use, but each vendor will have its own prefered list. Hence the vendor resource file feature of pcb!
-Dan --
