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January 2002

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Subject:
From:
Geoff Layhe <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 16 Jan 2002 14:13:07 -0000
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Just had to comment on this one. I can remember making 12 layer boards in
the mid 1980's and removing the unused pads to give a smoother hole and
reduce smear, nail heading etc on pads which were connected.- It worked for
us..

The thinking was that as the drill goes through a copper pad a lot of heat
is generated if the pad is connected to a large copper area then some of the
heat is dissipated but if the pad is unused then the heat has nowhere to go
and builds up in the drill leading to poor hole quality.
Anybody else ever remove unused pads for this reason?

Geoff Layhe



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