On 12/06/2012 04:54 AM, Jeff wrote:
> A friend descried to me a method for plating through holes. The plating is accomplished by inserting a wire into the hole and applying a high voltage to the wire, exploding it and connecting the layers together. A pdf is available on google. It was too big for yahoo. Despite the questionable looking address, it is real.
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> https://docs.google.com/open?id=0B9UJMWQidYN0ZE1yNWEzQmluSWc
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> Curt's description
> It involves feeding a thin copper wire through the hole until it touches a massive ground plate which allows a capacitor charged to 300 - 400 volts to discharge and literally melt the wire rapidly enough to cause it to 'explode' and bond to the internal copper layers. I find that 10 to 15 bursts leave enough copper for a sturdy through hole. I use an X Y table to position the board under a chuck that grips the wire and is connected to the high voltage source. A small stepper motor feeds the wire through the chuck from a spool.
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> Jeff
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The link gave me engine CDI device. Well the DC/DC is usable for
exploding wire I don't know if that's correct file at all?
Is there some video or similar stuff available?
It's seems to nice to be true. But I can't imagine how to apply such a
current to explode cooper wire and have collet still usable. If there is
cooper plate on one side so how to design other side where wire feed is
needed (probably something like MIG welder?!?)
Slavko.