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----- Original Message ----- From: <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, January 04, 2005 7:26 PM
Subject: [FlyRotary] Re: single rotor stuff
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
That is why I called it "reverse case hardening". Use a strong flame and move stady so that the surface is just cherry red. The area of the new bearing surface is not in the originally hardened zone, at least in my case. My next e-shaft will be rehardened in a special metal treating shop.
In the pisture is the e-shaft of the presently running engine with an inner needle bearing race pressed on, instead of a hardened surface.
Richard Sohn
N-2071U
Homepage: http://www.flyrotary.com/
Archive: http://lancaironline.net/lists/flyrotary/List.html
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