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Date: | Tue, 08 Jul 97 22:25:31 EST |
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Tom:
We work to a stated minimum character height of .040"
and thickness of .008". We also perform an "autoclip" of
the nomenclature, which obliterates any silkscreen
characters that fall within .008" of a solderable feature,
due to silkscreen tolerancing. Yes, "R"s sometimes end up
looking like "P"s, and "B"s like "3"s. This is why I have
been encouraging my customers for years to eliminate
silkscreen if possible. An added benefit to eliminating
legends is a cost savings of about $1/panel per side (divide
by # up per panel for piece price savings). I realize that
eliminating silkscreens requires a culture change, to say
the least, but most designs of late do not afford the real
estate necessary to screen these alpha-numerics onto circuit
boards with any degree of legibility. Many folks are
designing a different shaped pad for pin 1 (a square) in the
etch pattern for component orientation.
Tom Coyle
Field Services Engineer
HADCO Corporation
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