"steamer" wrote in message
...
--Seems to me you'd be better off making the cooling coil out of
stainless tube, lest you risk a burn-thru of the copper, which melts at a
much lower temp, yes? Better safe than sorry and all that... Heat transfer
sucks big time with stainless compared to copper tho.


Nope! Commercial induction furnaces use copper coils, which are water
cooled. Burn-thru is no problem as long as you don't expose the coils to
the melt, and make sure you have water circulating. The typical induction
furnace has a pressure switch that shuts down the furnace if you lose water
pressure.

Harold