Re: Torque Wrench adapters...

[KSMITH1@mailgw.sanders.lockheed.com]

CHRISTOPHER BENDER postulated about Torque Wrench adapters...

++++++++++++++++++++++++++++++++++++++
     I've been listening to a lot of talk about this subject recently, and 
     so far only one guy has got it right.  I forget his name, but he 
     concluded his proof with "Q.E.D.," which stood out to me, because my 
     favorite math professor used that all the time.   The latest post has 
     it totally wrong.  A guy claiming to be a mechanical engineer [James       
     Marriott, I think] tells us 
     that the torque calculation has nothing to do with the length of the 
     torque wrench.  Hello?!?  This is simple statics!  How long ago did 
     you have the course???  Well, I'm getting fed up with the ignorance, 
     and I am gonna take a stab at it.
     
     <snip>
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I vote with James Marriott on this one.  While the torque wrench length might 
matter if one was measuring the force put on the handle end, the torque wrench 
is measuring torque at the business end.  The torque at the setting causing the 
click, or causing the pointer to reach the desired value, is the same whether 
the wrench is 1 ft long or 20 ft long.  It follows then that the torque on the 
bolt connected to the other end of the extender is also independent of the 
torque wrench length.  A little time spent with a (static) force and moment 
diagram will lead to Mariott's answer.  (And I took statics in 1961.)

Quod erat demonstrandum!

***                 ...Kirby    (Kirby A. Smith)                 ***
***              ksmith1@mailgw.sanders.lockheed.com             ***
***              [=]   kirby.a.smith@lmco.com                    ***
***  Opinions expressed herein are entirely those of the author. ***