Subject: hardie

From: [email-masked]
Date: Fri, 20 Sep 1996 18:36:08 -0400

I have made a hardie from a jackhammer bite how should
I harden it.
Thanks!

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From: George Ezell <[email-masked]>
Date: Fri, 20 Sep 1996 19:58:47 -0500

> I have made a hardie from a jackhammer bite how should

Hi Travis,
	Is this a cut-off hardie, or some other type?  If it is
a cut-off, I'd suggest quenching the edge in oil, and drawing the
temper back to a dark blue, say 550 degrees.  I'd suggest tempering
all tools at least twice, for three hours.  You might want it a 
little harder than that, but this way it will not chip on you at a 
bad time.
	George

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From: Tom Vincent <[email-masked]>
Date: Sun, 22 Sep 1996 22:31:49 -0500 (CDT)

How did you make it? Many jackhammer bits are S-5. Lets see, forge 
between 1425 and 1900. Stress release after forging at 1000 F. Cool slowly 2 
hrs. Ok, bury in vermiculite and pray. Oil quench from 1625. Make sure 
there are no shadows in the metal. Temper at between 300 and 550. 500 
gives (I think( a 57 Rockwell. Don't leave out the stress relief step, 
and don't push either extreme on those forging temperatures. However, to 
develope good forge practice, get a spec sheet to double check. Tom