Woods metal is an alloy of tin-lead-bismuth-cadmium. Hmm, low
temperature solder. I suppose that is one way of tinning your boards :-)
Les
> Anyway, 'high' temperature alloys exist, like Woods metal. It melts at
> around 50C, so that would work. Only a couple of trivial problems remain,
> like is Woods metal attacked by etchant, and how does one pump molten metal
> onto a PCB?
>
> Hmm, PCB sits on a Peltier, cooled enough to avoid condensation. Molten
> metal held in a syringe, forced out by plunger, retract plunger slightly to
> stop. Same as solder paste. If you test conductivity between the PCB & the
> shrine, you can see when the track start to get laid. How to do wider
> tracks?
>
> PCB is etched, then placed in hot water to remove Woods metal. Metal is
> reused.
>
> Right then, "who wants to try it", he says, thus showing an idea is worth
> zero unless you can show it works.
>
> Tony
>