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
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