[TriEmbed] TriEmbed Digest, Vol 44, Issue 18

[Robert Gasiorowski]

I would stay away from auto router as much as possible, but you could use
it as a quick start for complicated boards.

1. it is best to manually run power traces first
2. run auto router for the first time
3. move around traces and vias that looks odd and that could be relocated
4. rip up everything that still looks odd
5. run AR again and repeat steps 3-5 as many times as it takes to get good
looking layout
6. fix clearances between traces, pads, and vias

Here's an example:
after first AR, N$14 is a disaster
[image: Inline image 1]

Rip it up and move up via that is next to N$40
[image: Inline image 2]

run AR again, looks better?
when doing step #6, make traces that connect to pads at angle (N$13,N$40)
to look like N$14
[image: Inline image 3]


On Fri, Jan 20, 2017 at 8:17 PM, Pete Soper via TriEmbed <
triembed at triembed.org> wrote:

> On 01/20/2017 04:07 PM, Alex Davis via TriEmbed wrote:
>
>> Pete,
>>
>> what's the trick to getting decent performance out of the Eagle
>> autorouter? The few times I've tried it, it's made a mess. On the other
>> hand, I'm not routing wide data and address buses, so maybe it's useful
>> for that sort of thing. I guess when I start doing 4-layer boards or try
>> to do a 68000 retrocomputer in KiCAD we'll see how badly I screw myself.
>>
>> Alex
>>
>
> By "decent performance" do you mean esthetically pleasing, or avoiding
> routing failure? In my experience component placement correlates with both,
> up to a point. The Eagle autorouter frequently makes silly looking routes.
> Another advantage of the purple OSH Park solder mask: makes the traces
> nearly invisible. But also, trace widths and routing grid size can affect
> quality.
>
> -Pete
>
>
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