Re: [Phys-l] Torque and wrenches

["Donald Polvani" <dgpolvani@verizon.net>]

On 3/14/11 at 11:55 PM BC wrote:


> On 2011, Mar 14, , at 15:57, trappe@physics.utexas.edu wrote:
 
> > Some of the early torque wrenches even had a pivoting handle so that  
> > the point of application of the force was exact.


> Knife edge?

> bc  had one which along w/ his dc non-insertion ammeters disappeared.

I still have my Sears Craftsman 1/2" beam-type torque wrench bought in the
late 70's.  The handle of the wrench can pivot about the beam at a point
near the center of the handle.  The pivot is provided by a hinged pin
through the handle and beam.  By the way, it is calibrated in both English
and metric units.

At the time, I bought the wrench to work on my car (a '71 Plymouth Scamp
with a "slant" 6 cylinder engine) and was unsure whether to get the 3/8" or
1/2" drive model.  I bought the larger unit and actually was able to reach
each and every one of the 6 spark plugs with ease!  I wouldn't even bother
to try with our 2010 Mercury Milan Hybrid.  I can't even see all the spark
plugs in the 4 cylinder gasoline engine also provided in that car; let alone
use a 1/2" drive torque wrench on them.

Don

Dr. Donald Polvani
Adjunct Faculty, Physics
Anne Arundel Community College
Arnold, MD 



-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu
[mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Bernard
Cleyet
Sent: Tuesday, March 15, 2011 11:55 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Torque and wrenches


On 2011, Mar 14, , at 15:57, trappe@physics.utexas.edu wrote:

> Some of the early torque wrenches even had a pivoting handle so that  
> the point of application of the force was exact.


Knife edge?

bc  had one which along w/ his dc non-insertion ammeters disappeared.


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