Subject: Re: [baidarka] FW: Crooked knives
From: Brian Huffaker (bifft@xmission.com)
Date: Thu May 11 2006 - 14:49:37 EDT
On Thu, 11 May 2006, Calman, Scott wrote:
[snip]
>galvanized pipe as an anvil. Then I re-tempered the blade by reheating
>the entire thing(Propane torch with MAPP gas) and let it cool slowly in
>very hot sand. How I got the sand hot was by cooking it in the oven at
>4500 for an hour and then put it in a plywood box. I then dropped the
>knife in the box, buried it in the sand, covered it with the lid and
>stuck the whole thing in a blanket. I left it that way until the next day
[snip]
You actually annealed the steel with that treatment. Even good steel
won't hold an edge long after that. Try heating it again till it isn't
magnetic, quenching in oil, then reheating to 3-400 or so in an oven and
it might not need to be sharpened quite so often. (The downside is that
it might crack in the quench and you'd be out a tool that is already
working for you.)
Need to forge myself a crooked knive one of these days.
Brian Huffaker, DSWL (bifft@xmission.com)
RV-8A 80091 drilling roll bar.
1/4 Starduster II N23UT flying
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