Hi all, I’m using Ultiboard to design a relatively simple 2 layer PCB however DRC bot keeps rejecting it for a trace too thin error.
However the DRC bot highlights the pads of two SMT components as being under the 8 mil rule when these pads are clearly well over 8 mil. As you can see in the image returned by the bot, orange highlighted pads are apparently too small:
This looks really similar to a problem people have been having with Eagle when rotating parts. In that case, the pads are drawn with a really fine line (to get the square corners), and the DRC bot flags it as “aperture too small”.
I’ve read that Eagle has fixed that in the new version. You’re probably at the mercy of Ultiboard to do something similar.
leon_heller:
I can have rounded corner rectangular pads with the Pulsonix software I use. Would that get over the problem?
It all depends on what Gerber commands get generated, but, theoretically, yes. Make sure the rounding uses a radius of at least half the minimum aperture width.
Well I fixed it I just don’t know how. I changed all of the pads for those two parts from rounded rectangles to sharp edge rectangles and DRC bot lets it through. Thanks!
AndrewBurns:
Well I fixed it I just don’t know how. I changed all of the pads for those two parts from rounded rectangles to sharp edge rectangles and DRC bot lets it through. Thanks!
It’s probably using the rectangle aperture shape now instead of trying to draw it with lines. Just a guess, of course. Those corners looked sharp in the image (even though they were rounded); maybe the lines it was using to draw them were narrower than the DRC bot allows. If you try rotating one of those parts by, say, 45 degrees (assuming your software allows that), the problem may reappear, as the rectangle aperture shape cannot be rotated, so it would have to go back to drawing with lines.
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