On Wed, 10 Nov 2010 16:57:33 -0500 DJ Delorie <[email protected]> wrote:
> > > contact areas, presumably important to assist accurate placement of > > the LED. > > Turns out resist is a better black-body emitter than shiny metals. > > > It looks like I can in fact set different solder mask clearances for > > overlapping pads, but I have not been able to make a pad entirely > > covered with solder mask. Is this possible? I found that > > doing changeclearsize to 1 mil gave almost complete solder mask > > coverage, but some copper was exposed. > > You should be able to set the mask to exactly zero, although it might > be easier to edit the .fp file than do it in PCB itself. You'll also > need this bug fixed: > > https://sourceforge.net/tracker/?func=detail&aid=3100510&group_id=73743&atid=538813 Thanks for the footprint example. That is really helpful. I built pcb HEAD with the patch (pcb-src-draw.c.diff dated 2010-11-01 05:40:45 UTC) from that bug applied and it seems worse. With the patch applied, I actually get a much worse result with the footprint example you provided. The solder mask doesn't touch the big pad at all. See my screen shot collage at <http://gibibit.com/upload/2010-11-10_pcb_mask_drawing1.png>. The lower-right image shows the patched version with the solder mask showing. > > Does anyone have any recommendations or tips for me on creating a > > pcb footprint like the one on page 10 of the data sheet? > > Three pads per terminal. One big one for the resist-covered parts, > two overlapping small ones to make the T shape. Something like this: > > Element["" "" "" "" 181102 181102 0 0 0 100 ""] > ( > Pad[-3543 4724 3543 4724 3937 1200 4537 "" "1" "square"] > Pad[0 7481 0 7874 2362 1200 2962 "" "1" "square,edge2"] > Pad[-11811 10630 11811 10630 15748 1200 0 "" "1" "square"] > Pad[-3544 -4725 3542 -4725 3937 1200 4537 "" "2" "square"] > Pad[0 -7874 0 -7481 2362 1200 2962 "" "2" "square"] > Pad[-11811 -10630 11811 -10630 15748 1200 0 "" "2" "square"] > ElementLine [-7874 -7874 7874 -7874 600] > ElementLine [7874 -7874 7874 7874 600] > ElementLine [7874 7874 -7874 7874 600] > ElementLine [-7874 7874 -7874 -7874 600] > ElementLine [5512 -7874 7874 -5512 600] > > ) Thanks for taking the time to do this! OT: Back in the 90's, when I was 13 years old and learning to program using DJGPP, I would not have thought I'd be interacting with DJ Delorie in 2010! :-) P.S. thanks for all your work on DJGPP in the past as well as the gEDA project. Regards, Colin _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
