Prepatch, you could have just ignored the PCB DRC bug in a footprint you knew to be accurate.
> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:geda-user- > [EMAIL PROTECTED] On Behalf Of David Kuehling > Sent: Tuesday, February 27, 2007 1:10 AM > To: gEDA user mailing list > Subject: Re: gEDA-user: DRC problem at close pads > > >>>>> "Dan" == Dan McMahill <[EMAIL PROTECTED]> writes: > > > David Kuehling wrote: > >>>>>>> "DJ" == DJ Delorie <[EMAIL PROTECTED]> writes: > >> > >>>> http://user.cs.tu-berlin.de/~dvdkhlng/clearance-problem.png > >> > >>> Could you post (or send me privately) the .pcb file? > >> Here is a simplified file that only contains the problematic > >> footprint. Quite possibly this is just a problem with the footprint? > >> After all this was hand-coded in M4... > > > I'd be more likely to suspect the footprint if "after all it was hand > > drawn instead of generated programattically"... > > > Ok, here's the deal. It is a bug in pcb. Square (or rectangular) > > pads are checked by growing one of them in X and Y on all 4 sides by > > the minimum space. This of course means that the corners grew by > > sqrt(2) more and thats why you got a failures. I'll try to cook up a > > patch tonight. > > Yes, I now remember having seen some illustration in the PCB user guide > (section 7), illustrating how lines (pads) with rectangular ends are > drawn by a rectangular aperture (on page 57). > > The clearance is drawn as a rectangle, so one could take the current > behaviour as being right. Else somebody would have to fix the > documentation :) > > I already reworked my footprint, moving the pads a little outwards. > Hopefully this will work in production (but since there isn't an > oficially recommended pcb layout for the chip in question the footprint > is a rough guess anyway). > > Thanks also for your patch. But since my layout already changed, there > might not be much testing that I can do. I'm going to upgrade PCB > anyway before exporting the final gerber files (I heard of some problems > which aren't fixed yet in pcb-2006082) and will then test the patch. > > regards, > > David > -- > GnuPG public key: http://user.cs.tu-berlin.de/~dvdkhlng/dk.gpg > Fingerprint: B17A DC95 D293 657B 4205 D016 7DEF 5323 C174 7D40 > > > > _______________________________________________ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
