I agree wholeheartedly with Werner's statement and
conclusion that the possible gain in reliability is not
worth the loss in manufacturability. In some cases, if the
non-functional pads are required to be left on, drill stack
height is reduced and this impacts board cost. The round
robin study is also quite outdated (I believe the late
'80's), and was done at a time when small hole drilling was
new to everyone. There have been several process
enhancements since then. Hmmmmm....maybe it's time to do a
new study?!?
Tom Coyle
Field Services Engineer
HADCO Corporation
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