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snarflemike wrote:I'm using Eagle right now, but I'm sure my question is not Eagle-specific. When using an autorouter, what are the guidelines/tradeoffs in selecting a value for the routing grid?If you have a low density board (mainly DIPs), then a 25-mil grid may work. Otherwise, I'd go for a 10-mil grid, or possibly a 5-mil grid. Basically, try different grid and see what works best for your board. I've noticed that EAGLE's auto-router (AR) leaves a bunch of wiggly lines when the grid is too small. It looks like it "changes its mind" quite a bit with small grid settings. I've gotten tired of cleaning up after EAGLE's AR, so I rarely use it anymore. If nothing else, running EAGLE's AR will give you some ideas of how to manually run traces.
leon_heller wrote:I don't understand how the routing grid is relevant to the board supplier.By setting the routing grid less than the min spacing allowed by the PCB manu, there is the chance for two traces to either be spaced below this min clearance or the clearance with another part/pad could be less. Thus causing it to fail the min requirement. Such as GP's 7 mil min.
leon_heller wrote:I don't understand how the routing grid is relevant to the board supplier.
leon_heller wrote:The software I use won't let me make errors like that.I am pretty sure your right there. I have used a 5mil grid in the past many times on boards with 7 or 8 mil clearance. EAGLE is smart enough to not violate the DRC when autorouting.
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