--- In [email protected], Robert <birmingham_spi...@...> wrote: > > I routinely have to route boards that use a chip with an MLF footprint. > This is a pain when manual routing because the clearance has to be > dropped from 12 thou (US "mils") to 6 thou when connecting or editing > tracks attached to its pins. However, I don't want to do the whole > board at 6 thou because it's unnecessarily risking inter-track shorts. > > I would like to be able to use the Freerouter autorouter so I don't have > to spend so much time routing. That means I need to somehow be able to > tell Freerouter to use 6 thou for the MLF device and 12 thou everywhere > else. It will AFAIK do this (if I define a clearance class "mlf"), but > kicad seems to export tracks with just one track clearance, "default", > which of course I want to have a clearance of 12 thou. I can't find > find a way to manually define another track class and tell Freerouter to > use it for the mlf pins. > > I'm currently experimenting with fanning out the pins on the mlf device, > but of course the direction chosen inevitably isn't optimal and then the > autorouter ends up stuck. > > I would appreciate any suggestions on how to solve this problem. If I > manage to find a solution I'll post it. > > Regards, > > Robert.
Robert, Search is not working in this yahoo group for me. I think yahoo may be off yahooing. But if and when it works, you could find an earlier posting from me that talked about manually editing the DSN file and adding a net class and moving nets out of the kicad_default net class. This controls the spacing on the entire length of the net, I am not aware of how to do this differently at different points along the path of the net. Try asking Alfons at freerouting.net and then let us know please. Dick
