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Re: Re: Brake Caliper Conspiracy

To: "Michael Marr" <mmarr@notwires.com>, "Nolan"
Subject: Re: Re: Brake Caliper Conspiracy
From: <jerryvv@alltel.net>
Date: Fri, 30 Dec 2005 9:07:25 -0500
My head is starting to hurt!
JVV
> 
> From: "Michael Marr" <mmarr@notwires.com>
> Date: 2005/12/30 Fri AM 08:39:47 EST
> To: "Nolan" <foxtrapper@ispwest.com>,  "Guy D. Huggins"
>   <guy@genfiniti.com>, 
>         "TR Mailing List" <triumphs@autox.team.net>
> Subject: Re: Brake Caliper Conspiracy
> 
> > Torque values are for the nuts and bolts, not the pieces holding them
> > together.  It's simply a matter of determining the size and grade of the
> > bolt(s), and then looking up the torque values for them.
> >
> Whoa!  I have to disagree with you on this one, Nolan.  It's not that 
> simple.  The tightening torque for a threaded fastener is only one, very 
> imprecise, way of measuring the clamping force of the fastener combination 
> (bolt/nut, nut/stud, bolt/internal threaded hole in component etc.).  As 
> Randall pointed out, it is a somewhat imprecise measurement.  In theory, 
> because of the "inclined plane" nature of the thread, the more force you 
> exert in the direction of the minor angle of the plane, the greater the 
> force exerted normal to the surface of the plane (= clamping force).  The 
> force you exert on the bolt or nut by pulling on the wrench is multiplied by 
> the moment arm of the wrench you are using.  Thus, a 45 lb pull on a 1 ft 
> wrench = 45 ft-lbs.  If you are applying this torque to a 1/2 inch bolt, 
>...................
> 
> Michael Marr
> 1960 TR3A
> Naperville, IL


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