pjrose at frontiernet.net
Thu Aug 7 10:42:38 PDT 2008
>Phil Rose wrote:
>> >Basically just heat the
>> >washer until it is red hot, then cool it in a bucket of water.
>> Anneal it, yes, but do NOT "cool it in a bucket of water"!! Allow it
>> to cool slowly--since the goal of annealing here is to eliminate any
>> of the "extra" hardness it's acquired
>I'm no metallurgist, but this site (the first one I found) said the
>rate of cooling does not matter -- slow or fast works the same.
>Let the debate begin.
Kent has pointed out something of which I was (obviously) not aware:
namely that--for copper--the rate of cooling is inconsequential.
Hence it evidently works equally well to either cool down slowly
(e.g., in air) or to quench in water. So I stand corrected.
Evidently copper, unlike steel, requires an enormous rate of cooling
to actually harden--millions of degrees per second. The bottom line
for the DIYer is that the procedure is very easy to do and nothing of
a critical nature involved other than watching out for your fingers.
mailto:pjrose at frontiernet.net
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