I found some documentation in a book called "Purchasing Magazines guide
to the PWB marketplace"  Author's Caren B. Lane and George A. Mancuso
Chapter 26  page 26.8  this article in the book written by Jan Adcock of
the Advanced Circuitry Division of Litton Systems, Inc. (Springfield MO.)
states "Check that internal signal layers have no unused or noncircuitry-
connected pads at hole locations.  The Manufacturer should request to
remove the unused pads on all internal layers."

Satisfied ?
Karl Bates
[log in to unmask]

To: DesignerCouncil <DesignerCouncil @ ipc.org> @ Internet
cc:  From: larryc @ bfgaero.com @ Internet
Date: 09/30/96 09:20:00 AM
Subject: Inner layer pad suppression

To Jeff Foster and Louis T. Dallara,

Last week I wrote:

" but there has been no documentation that I have seen.  One vendor doesn't like to have them because he believes of the possibility of spinning the internal pad since there is no track to hold it in place.  This may or may not be a valid point. "

I'm sure you guys think you have a point, but you failed to mention what it was.  Show me something other than your opinions.  I need something quantatative.  Give me something in print.  I'm only relaying what one board vendor told me. As stated, it MAY or MAY NOT be a valid point, but since there's nothing to prove OR disprove it, the board vendors opinion is just as valid, if not more so, than your responses.  He has to make the boards and sell them to me.  If he feels this is a point to increase his yeild, and there is nothing to disprove him (and you didn't do that), then there is nothing wrong with his reasoning.  
I read and respond to this board for one reason only, to give input and to learn, not to see myself in print.

Larry Campbell
Supervisor, PWB
BFGoodrich, Avionics Systems

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