Re: [ST] countershaft sprocket

["Mike Young" <myoung@xxxxxxxxxxx>]

The "hammers" inside the wrench are accelerated to some useful
rotational speed by either air or the electric motor. They then impact
the "anvil" which is attached to the socket by the output shaft. The
energy transferred to the anvil is really high in force, but the
duration of the transfer is just barely more than zero. The reaction
felt by the operator is fairly low in force, but the duration is how
ever long the trigger is held down. Friction and the specific geometry
of the hammer / anvil interface means that you feel some of the impact
through the handle of the wrench, but nothing like what you are applying
to the fastener. The big 1" drive units have enough torque in their
motors to tie you up pretty good, and you will often see a 3 or 4 foot
cheater bar as an accessory on these monsters. 
HTH

Mike Young
'06 ST
Seattle

-----Original Message-----
From: st-bounces@xxxxxxxxxxxxxxxxxxxx
[mailto:st-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Matt Knowles
Sent: Monday, December 18, 2006 2:40 PM
To: ST@xxxxxxxxxxxxxx
Subject: Re: [ST] countershaft sprocket


On Dec 18, 2006, at 1:52 PM, halfast3 wrote:

> At the other
> extreme, I also have not-so-fond memories of being turned on my head
> by a 1" drive impact wrench :o|.
>

That's exactly the problem I was wondering about. The torque on the 
bolt is supposed to be 132 foot/lbs. So with my 12" ratchet I have to 
supply 132 pounds of force. With the 3' extender I would only have to 
supply 44 pounds of force which apparently wasn't anything close to 
what it's going to take to remove this nut.

So if you have roughly 6-8 inches of leverage with an air wrench (I'm 
guessing on this, I don't know what these look like)  you'd have 
something like 264 to 198 pounds of force needed. I only weigh 165, so 
I figure I'd lose that battle.

Since I believe the law that for every action, there is an equal but 
opposite reaction is still in effect, how can an impact driver impart 
that much torque and stay in the mechanics hands?

Matt Knowles - Ferndale, CA - 
http://www.knowlesville.com/matt/motorcycles
  '99 Sprint ST - for going fast and far (2CZUSA)
  '01 KLR650 (A15) - for exploring the North Coast backroads
  '97 KLX300 & '01 Lakota - for playing in the dirt
  '79 KZ400 - just because it was the first vehicle I ever owned

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