Subject: Re: Hardening new reamer

From: [email-masked] (D.J. Richards)
Date: Wed, 01 May 1996 22:11:48 GMT

rfra@ernie (Bob Frazier) wrote:

>	Greetings All, after painstakingly creating a chamber reamer for gun barrel 
>work, I attempted to harden the oil quench drill rod with a charcoal fire 
>followed by quenching in a cup of oil. I realize the temp of the steel is 
>important, but as I'm monetarily impaired, I thought I'd give it a try.
>I doused the reamer in caseinit to increase my chances of getting the rod
>hard. The hardness seems o.k., a file doesn't cut it. The problem is that the 
>narrow part of the reamer leading to a solid pilot warped like a crescent moon!
>	Maybe grinding this after heat treat would be the best solution.
>Any ideas?
>		Thanks, Bob Frazier	[email-masked]

I doubt that you will ever get away from warpage. I work at an outfit
that produces chamber reamers. Even using a vacuum furnace, we get
warpage. We machine the reamer .015 - .025" oversize and grind the
reamer to size. If the warpage is too much to grind out, we have to
straighten it by suspending it between centers and using an
oxy-acetylene torch to heat it and hammer (gently) it back relatively
straight, then grind it to size. I hope this helps you some

D.J. Richards
[email-masked]

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From: A_P_Sabol <[email-masked]>
Date: 2 May 1996 13:22:58 GMT

Why not use air hardened drill rod. It should not warp.

 Andy