On Fri, 2010-09-10 at 16:23 -0400, Windell H. Oskay wrote: > > The conductors may not be copper. I've even worked with a board that had > > two different conductive materials on the same physical layer. > > Interesting case. Let's suppose that you have conductors -- say niobium > and copper -- on the same physical layer. Does that have implications for > PCB? I'm not certain that I see any. > > I'd imagine that you ultimately need to generate separate gerber files for > the two separate conductors. That means putting them on separate layers in > PCB (or, I suppose, major architecture changes). If that was an inner > layer, you could lay it out as two separate inner layers and that would > work, so far as I can see.
With PCB as is.. you would probably use layer-groups to separate the distinct sub-layers. I don't tend to use them, so I couldn't swear to how the gerbers come out - but I'm certain it would not be hard to make it produce separate gerbers if necessary (you might just need to un-group the layers). > If the two conductors are both on the top outer layer, I believe that you > could use the same strategy, defining both to be in the same "component > side" layer group. Am I missing something? Yep... I should read the full email before starting to reply ;) Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA Tel: +44 (0)7729 980173 - (No signal in the lab!) Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me) _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
