my favorite layout guy once explained the notion of datum lines (I think
that's what they are called). Anyway, if you use an arbitrary line
(datum) in the center of your board, and reference all measurements to
it, the tolerances are only from that imaginary 1/2 way point to the
edges. It's better than if the reference is on an edge, then the
tolerance adds up along the entire length.
maybe the size of your boards, and your trace widths don't matter in
this case?
just my $0.05 worth :)
gene
DJ Delorie wrote:
how about layer registration? If the tolerances are out of whack,
nothing will line up very well.
I think if the individual layers are accurate (or at least equally
distorted), lining up the drilled clad shouldn't be a problem - just
add two corner holes, drill them separately on each board, and pin
them to line up the boards. I think this is an easier problem to
solve than lining up the etch resist on opposite sides of one board.
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