Torque Wrenches - my answer... (holy smokes!)

[Huw Powell]

Don't worry, my undying curiosity should get the better of me fairly 
soon.  Thanks for pointing out that a substitute for the 2079 in the 
puzzle is readily obtained in my toolbox.  Results will be reported 
either way, of course. (unless I forget to do it because something, 
anything, else comes up...)

I take it that you have previously performed this experiment, by the way...

> Come on guys!  This has gotten out of hand. The Audi torque wrench is 42
> inches long, the 2079 tool is 12 inches long, the torque setting is 258
> ft-lbs, the resultant torque at the bolt is 332 ft-lbs. The math is simple
> and explained in a previous post.
> 
> Prove it to yourself. All you really have to do is this.
> 
> Get a bolt and nut and put the nut in your bench vise, tighten the bolt to
> say 20 ft-lbs with your torque wrench.
> 
> Now get an open end wrench. Put the open end on your bolt and the closed end
> on the end of your torque wrench (pre-selecting the bolt head size to match
> your square drive torque wrench would be useful).
> 
> Now set the torque wrench to 20 ft-lbs and apply it. Did the bolt rotate
> some more? I'll bet it did. Remove the open end wrench, go back to the bolt
> and find the torque at which the wrench clicks. It will be larger than 20
> ft-lbs. In fact it will be larger by this ratio:
> 
> Total length of the combined open end wrench and the torque wrench divided
> by the length of the torque wrench.
> 
> BTW, the angle that you connect the extension and the torque wrench does
> matter. You can try it with the same setup and you'll find that you have to
> apply the cosine of the angle between the tools.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/