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Ed Caffrey's Workshop Talk to Ed Caffrey ... The Montana Bladesmith! Tips, tricks and more from an ABS Mastersmith.

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Old 07-11-2005, 08:32 AM
SamLS SamLS is offline
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Join Date: Jul 2002
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Double Edge Blade Hardening/edge quench

With a double edge blade like a "smatchet" whats the best method for hardening and quenching the edges of the blade and keeping the tip hard. If you heat and quench one edge at a time I would think you would anneal the opposite edge just back fron the tip. Would this be an instance where I would want to use the clay method and put fire clay at the center section and quench the blade in this manner. Thanks
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Old 07-11-2005, 11:52 AM
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mete mete is offline
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Location: NY State
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You can't quench one side then the other.You'd never get uniform results side to side . But you can use clay, just coat the center of the blade.
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Old 07-11-2005, 12:09 PM
AwP AwP is offline
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Location: Cleveland, OH
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You could also do a differential temper rather then a differential quench, i.e. draw the center to a softer temper with a torch being careful not to effects the edges. You won't get a pretty line, but funtionally the effects are pretty similer.

~Andrew W. "NT Cough'n Monkey" Petkus
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Old 07-11-2005, 01:36 PM
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GHEzell GHEzell is offline
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Location: North Alabama
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I'm with Mete on this, fireclay is the only way I've ever pulled it off. Wrap the clayed blade with non-galvanized iron wire to help hold the clay in place while heating and quenching.

Also, be sure your steel is sufficently shallow hardening, this wouldn't work too well with O1 or L6!
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Old 07-11-2005, 04:20 PM
SamLS SamLS is offline
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Thanks, I got a piece of O-1 as surplus from another job and intend to use it. I always wanted to do a smatchet. I suspect its due to their size they never caught on with the troops of course the Kurkuri is probably larger. I would like the blade differentailly hardened. If I heat it in a forge with a clay coat on the blade and handle area will the edges heat up enough first to just harden the edges with O-1. I found some info on this technique for 1085 and a sword web page but I know its hardening caracteristics are much different than O-1. I only have one piece and want my first try at this to turn out favorably thanks for the advise.
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Old 07-12-2005, 10:47 AM
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Ed Caffrey Ed Caffrey is offline
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I'm with Mete on this one. Clay is going to be about the only practical way to do it. In some instances I have had difficulty with clay hardening O-1, simply because is does a bit of air hardening qualities.

"Nobody cares what you know.....until they know you care."
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