"By the way, what is the easiest way to neatly wind a coil from 1/4"
copper
tubing to say 1 1/2' dia. I have heard that to heat it up first, then
quickly cool it will soften it and make it easier to wind. What works
good?"
This procedure hardens and tempers metal, not soften it. To soften, you
heat and then cool sloowly.
73, Roy K6XK
P.S...Most copper tubing already comes annealed (softened as above) for
easy working.
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