There is more to check than trace width. Will trace to trace/pad/drill space allow power nets to pass at desired width? Will the trace to trace/pad/drill space of surrounding traces allow power to pass by? This second one is the one that trips me up the most. Try routing one manually. You will see the keep outs as you approach. If they overlap no trace of any width will get by, this sounds like what you have.
Let me try to further clarify the problem, and describe what I am trying to do.
A 12 mil trace will fit between the connector pins, and I can manually fan out the power pins this way, and then AutoRoute successfully. However, I am interested to know if AutoRoute can do this instead of manually routing. The intention of changing the minimum trace width to 1 mil was so that the router could go as low as it needed to in order to complete the route.
Perhaps I there is another setting than the minimum trace width in the Clearance Design Rules?
bump. Can someone please help me answer this?
check Allow Trace Necking
This seems to work for the interactive routing in PADS Router. Is there any way to get the Autorouter to have similar behavior?
Never tried it.
It should work in Router as well.