> > The biggest hassle with an autorouter is to make sure you have ALL the =
rules set
> properly before you start, as in minimum signal track width, minimum powe=
r bus
> widths, minimum via size, minimum track spacing, the list just goes on an=
d on.
> >
> What do you do about power track widths on surface mount boards? you can'=
t make them
> big all over because you'll never get them into the tiny chips but you do=
n't want to
> make them small all over either. Do the PCB design systems you use (I use=
 altium
> myself and never spotted a way to express this)  provide a way to express=
 "make this
> size X if you can but make it smaller if you absoloutely have to to get i=
t into a
> chip".

I know Allegro has a way of allowing you to 'neck' a track to get between c=
losely spaced pins using narrower than minimum width tracks. Have had to us=
e this feature to get tracks between pins on a Nano-D connector.

I haven't seriously used the auto route function on any board, but have pla=
yed a couple of times to see what result it gave.
--=20
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