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From: <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Tap 'em  holes  was  [FlyRotary] Throttle Body
Date: Wed, 22 Aug 2007 8:34:13 -0500
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> 
> From: Ernest Christley <echristley@nc.rr.com>
> Date: 2007/08/22 Wed AM 07:44:02 EST
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Tap 'em  holes  was  [FlyRotary] Throttle Body
>  Nut Ideas
> 
> Ed Anderson wrote:
> > Scott,  I think the best answer is to simply tap those bolt holes for 
> > the thread size of your bolts.  This does a number of things.
> >
> > 1.  There is nothing to fall off inside the plenum, no nuts, no bolts 
> > or no nut plates
> > 2.  Its a few fractions of an ounce lighter
> > 3.  You never have to worry about getting onto the back side of the 
> > plate (looks like you intend to weld it to the plenum tube.
> > 4.  Two of your nuts are pretty close to the wall of your plenum if 
> > that bright circle is indeed where it will be placed - can't tell for 
> > sure but could be interference with the wall of plenum.
> > 5.  You never have to worry about it again.
> >
> > Ed
> >
> >
> I've been told by a machinist that tapped holes in aluminum are weak.  
> Any truth to that?
>
I tapped mine and used blue Locktite. It worked very well. You should know that the softer the material, the coarser the thread should be. Do not use fine threads in aluminum. Look at the wood screws. They are really coarse.
Buly