Our policy is unless there's some design related reason, we allow the
fabricator to remove them if they feel it suits their processes better.
Let him decide the tradeoff benefit. 


Bob Croslin
Nielsen Media Research

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Terry Kozlyk
Sent: Wednesday, February 09, 2005 10:05 AM
To: [log in to unmask]
Subject: Re: [TN] Removal of Non-functional pads

There was a lengthy discussion within the past year. Very interesting.

1 pro; makes the thru hole barrel stronger as there is more copper for
the plate thru process to hang on to.

1 con: more copper for drill to hit so dulls the drill faster.

This series of threads will be good too. It sound to me at the time that
one can't conclude yes or no. This may be an issue where some designs
may be better to have non-functional pads while others may be better off
without it.

As usual, great having e-mail discussions to make all participants
better versed.

Regards
TDK



-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Wednesday, February 09, 2005 7:54 AM
To: [log in to unmask]
Subject: Re: [TN] Removal of Non-functional pads

I have always considered non-funct. pads as being desirable, because
they help compress the prepreg layes into a compact mass which would
reduce nasties like CAFs etc. At the same time, the extra copper keeps
the drill bit cooler by conducting more heat away.

Brian

Pete menuez wrote:
> Can someone explain the advantage of removing non-functional pads on 
> innerlayers? We are contemplating adding non-functional pads to our
designs
> but want to understand the impact if we do.
>
> Thanks
>
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