[TR] torque wrench question

TERRY SMITH terryrs at comcast.net
Sat Aug 11 06:56:03 MDT 2018


LOL!  I'm just glad you science guys are out there!

> On August 11, 2018 at 5:51 AM Randall <tr3driver at ca.rr.com> wrote:
> 
> 
> > Uhm, that would be why English majors subscribe to this list....
> > 
> 
> Perhaps an example would help?
> 
> Let's say you want to torque your nut to 50 ftlb, your torque wrench
> measures 26" overall and your crowfoot extension is 4" overall.
> 
> First we need the effective length of the torque wrench.  On mine, the
> business end is about 1" diameter, while the hand grip extends about 2"
> beyond the center of my hand.  So we subtract half of the head diameter
> (0.5") and the 2" for the hand grip to get 23.5" effective length.
> 
> Now the effective length of the torque wrench plus crowfoot extension.
> Assuming both ends of the crowfoot are around 1" diameter, it would extend
> the center by about 3", or 26.5" overall.
> 
> Divide those two numbers to get the ratio.  23.5/26.5 = .89 (rounded to 2
> digits)
> 
> Multiply the desired torque by the ratio. 50 * .89 = 44.5 ftlb.  Round that
> to two digits, and set your wrench to 45 ftlb.
> 
> Hmm, well, perhaps not.  Reminds me of an old David Crosby line: "You see
> just below the surface of the mud, there's more mud here."
> 
> -- Randall  
>


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