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From: <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: single rotor stuff
Date: Tue, 4 Jan 2005 22:26:37 -0500
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> From: "Russell Duffy" <13brv3@bellsouth.net>
> Date: 2005/01/04 Tue PM 09:03:00 EST
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: single rotor stuff
> ...
> Great idea Richard.  Since you would have to get it re-hardened when it's
> through anyway, I don't see how that can hurt.  Was there anything special
> to heat treating it when you were done?  Naturally, I sold the gas torches
> that I had when I got the TIG.  I wonder if I could do this with a plasma
> torch :-)

Rusty,

   I don't know how you would control the process in a 
"home" shop, but the object isn't to anneal the whole 
part, but to "surface anneal" just deep enough to anneal 
*most* of the material you're going to remove.  The final 
size should be ground, same as you would have to do 
after re-heat-treating.

   Thus you need a very hot flame, for a relatively short 
time, to minimize penetration.

Dale R.
COZY MkIV #1254