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August 2003

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Subject:
From:
Robert Tarzwell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sat, 30 Aug 2003 08:03:07 -0400
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The shop steve is talking about is the facility I use to own ( sold it
and now retired to the Bahamas and doing a little consulting and writing
books)
we specilised in very heavy copper, typicaly 10 to 15 oz with a max of
40 oz. the plating can be as thick in the holes to allow for large
current capacity and amasing reliability, once you get over 3 oz of
copper in the hole it is near imposible to crack from thermal
expansion., to handle diffrent applications having two or three diffrent
copper weights all on the same board all intertwined and interconnected
is quite normal. One or two oz for SMT components and 12 oz for power.
The technology is quite easy to do (see megadawn.com for a listing of
the technologies and books available) and any compitent board shop can
quickly be manufaturing 10 to 20 oz boards. As seen in steves pictures
the line edge quality is simply amasing , its 90 degrees to the board
and very accurate.Almost no line undercut. using this same technology
you can make very fine lines down to .5 mil. Steve purchased my books
and  stated he got a lot of diffrent ideas from them. So there is no
reason to keep your heads buried in the sand, heavy coper does exist and
has been used for years, go forth and design. Oh ye of little faith.
robert Tarzwell  megadawn.com

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