Post by thread:[EE] eagle autorouter trace width

[Eagle] Where can I specify the trace width the autorouter will use? It does not seem to use the default width (the one that is used when I draw a trace manually), and I don't see a setting in the autorouter configuration. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: http://www.voti.nl/hvu

Edit / netclasses You can specify which classes get each width and spacing, but it's always been an annoyance that every piece of trace connected to the same signal has to be the same netclass and gets routed in the same size. (so large power traces with smaller branches to individual chips must be done by hand) -Denny {Original Message removed}

Wouter van Ooijen wrote: > [Eagle] Where can I specify the trace width the autorouter will use? It > does not seem to use the default width (the one that is used when I draw > a trace manually), and I don't see a setting in the autorouter > configuration. Create a separate class for each type of trace, then attach the class you want to each net. See HELP CLASS. ****************************************************************** Embed Inc, Littleton Massachusetts, (978) 742-9014. #1 PIC consultant in 2004 program year. http://www.embedinc.com/products

A simple way to have it use a single trace width for everything is to set the min trace width in the design rules. In the DRC settings, go to "sizes" tab, then set the minimum width. The autorouter always complies with the DRC minimums. You could set this to 10, say, do autoroute, then set it back to 8 so if you manually routed at 8 you won't get complaints when running the DRC on the board. Also, if you want it to use smaller than default vias, set the minimum drill. I use 16mils. But you also have to change the "restring" - go to restring tab, and for vias, outer, I have 8mil minimum, 25%, 16mil maximum. This makes vias with 16mil drills, the smallest size that doesn't require additional $ for pcb manufacturing. And you can (usually) fit a 30awg wire-wrap wire in the hole as well for fixing design problems on prototypes later... Hope it helps J Wouter van Ooijen wrote: {Quote hidden}> [Eagle] Where can I specify the trace width the autorouter will use? It > does not seem to use the default width (the one that is used when I draw > a trace manually), and I don't see a setting in the autorouter > configuration. > > Wouter van Ooijen > > -- ------------------------------------------- > Van Ooijen Technische Informatica: http://www.voti.nl > consultancy, development, PICmicro products > docent Hogeschool van Utrecht: http://www.voti.nl/hvu > >

olin_piclist@embedinc.com (Olin Lathrop) wrote: > Wouter van Ooijen wrote: > > [Eagle] Where can I specify the trace width the autorouter will use? > > It does not seem to use the default width (the one that is used when > > I draw a trace manually), and I don't see a setting in the autorouter > > configuration. > > Create a separate class for each type of trace, then attach the class > you want to each net. See HELP CLASS. Beware, though, Eagle sometimes doesn't do the Right Thing, so check the results carefully. I had one design that had some high-voltage traces, so I created a couple of classes with larger clearance values. However, I found that in a few instances, Eagle routed a low-voltage net too close to a high-voltage net because it used the smaller clearance value instead of the worst-case (largest) value among the two nets. I had to fix this manually. IIRC, a post-route manual DRC pass showed the problem, so just don't rely on the autorouter alone. -- Dave Tweed

On 4/5/06, Wouter van Ooijen <spam_OUTwouterTakeThisOuTvoti.nl> wrote: > [Eagle] Where can I specify the trace width the autorouter will use? It > does not seem to use the default width (the one that is used when I draw > a trace manually), and I don't see a setting in the autorouter > configuration. One good solution is to go with one width (after you've routed power supplies and/or power route/plan manually) let the router to do all bulshits and then correct manually the mistakes and route widts. Don't try this for mixed designs, you'll be dissapointed even if using restricted areas. Vasile > > Wouter van Ooijen > > -- ------------------------------------------- > Van Ooijen Technische Informatica: http://www.voti.nl > consultancy, development, PICmicro products > docent Hogeschool van Utrecht: http://www.voti.nl/hvu > > > -