I have run into this problem but what you have described has not
worked well for me. I may define a power class with a 5mm trace width,
but that will not autoroute to a chip with a 1mm pin pitch.
As my designs have grown more complex I have found the eagle
autorouter to be less and less useful and I have started routing
manually more and more. I wonder if the autorouters from the more
expensive software packages are more intelligent about such things.
--- In
Homebrew_PCBs@yahoogroups.com, "Robert Ussery"
<uavscience@f...> wrote:
>
> You'll want to create different classes in the schematic. Type
"class" into
> the command line interface. A dialog comes up with class
definitions. You'll
> probably only have a "default" class. Define some more classes,
such as
> power, clock, etc. with the trace widths, clearances and drill
sizes you
> want. Then type in "change class". A menu with all the classes
comes up.
> Select the class you want, and then click on the schematic nets you
want to
> be the new class. Then go to your board and autoroute. The different
classes
> should show up with their different widths, clearances, and drills.
>
>
> - Robert
>
>
>
> >-----Original Message-----
> >From: joshdewinter [mailto:joshdewinter@y...]
> >Sent: Wednesday, February 11, 2004 7:06 PM
> >To: Homebrew_PCBs@yahoogroups.com
> >Subject: [Homebrew_PCBs] Another Eagle question for the experts
> >
> > Thanks Phil, Javaguy and Rusty for the tips with Eagle. The via
> >thing was so simple, I didn't even think of doing it.
> > I have another one for you. I've read the manual and didn't see
> >it. You'll probably slap me for being ignorant, but here goes:
> >
> > How do you change the width of the tracks the autorouter uses? I
> >have tried changing the line width before using the autorouter, but
> >it sticks to the line size it appears to like best. If I group all
> >the traces and use the change tool after they're drawn, I get
> >overlapping lines if they get too big.
> > How can I specify lines with big width before routing, so the
> >autorouter doesn't overlap them?
> >
> >Thanks very much for the help