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Date: Wed, 28 Feb 2007 11:05:39 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: engine mount 4130 vs 304 SS
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Russell Duffy wrote:

> Thanks for the comments Lynn.    I only have TIG to weld with, and the 
> gyro won't be traveling unless it's on a trailer, so weldability isn't 
> an issue.  I did figure that 4130 was stronger, but don't know if it's 
> enough to matter, particularly since I'll be probably using 2-3 times 
> the size I really need.   Fortunately, the quantity I need is so small 
> that I won't be shopping around for price.  I'll just order from 
> McMaster Carr, and have it next day via UPS ground.  Gotta love the 
> way that works :-)
>  
> Cheers,
> Rusty

You'd better order you some drill bits along with the stainless.  
Stainless work hardens very fast, and eats drill bits for dinner.  
You've got to use enough pressure to get the bit to bite and keep 
biting, keeping it below the work hardened surface left by the previous 
bit edge.  If it gets away from you or the bit gets dull, the bit will 
spin on the surface, heat the metal locally, and make it super hard.  I 
don't have that much control, so I just went through a lot of bits 8*)

-- 
         ,|"|"|,              Ernest Christley       |
----===<{{(oQo)}}>===----    Dyke Delta Builder      |
        o|  d  |o        http://ernest.isa-geek.org  |