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gEDA-user: PCB routing pitch

I'm going to design a PCB using a 4/4 mils (or better) fabrication
rule. Does anyone know if PCB manufacturers use an arbitrary routing
pitch/accuracy? I imagine there might be some software or data format
limitations involved. What kind of pitch value should I expect? 4mils,
1mil, 1um? My target is to position traces with an absolute accuracy
of 10um or better so anything below that (especially if the pitch is a
factor of 100um) would do fine.

Andrzej


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