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Date: | Fri, 27 Oct 95 08:44:58 EST |
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It is good design practice to allow a minimum of .010" from
any plated feature (pad or trace) to the board edge.
Bringing copper right to the board edge makes for possible
rough edges where the metal has been cut into by the
fabricator's router bit. Since the overall dimension of the
pcb has a tolerance, the .010" is recommended.
I, too, have seen designs where a plated hole has been "cut
in half" at the board edge. I have also seen the plating
yanked out of the hole wall when the router bit cuts through
these holes.
Even non-plated holes that come closer than .010" from the
board edge can fracture the material when the router bit
comes close to these holes.
Tom Coyle
Field Services Engineer
HADCO Corporation
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