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  #191  
Old 02-16-2012, 02:33 PM
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Mike S Mike S is offline
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  #192  
Old 02-16-2012, 02:34 PM
Birkelbach Birkelbach is offline
 
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Quote:
Originally Posted by L.Adamson View Post
I'm visualizing that last partial revolution of the nut..........as it get's very close to the final torque setting. Let's say that it has 1/8" of travel to go...........but the 12" bar (along with the 3" extention), is suddenly changed to 24" with a cheater. Does that last 1/8", now become 1/4, 3/16, or whatever.............because the torque setting must now be 88.9?

edit: This example would be with a click wrench
The 'movement' of the nut is irrelevant. As is the type of wrench. We are talking about torque. The nut will be in the same place after we are done with all this regardless of how we applied the torque. The question is how did we measure the torque on the nut. We are measuring the torque 3" away from the nut and that is what causes all the assumptions to change.
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  #193  
Old 02-16-2012, 02:55 PM
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Quote:
Originally Posted by Birkelbach View Post
The 'movement' of the nut is irrelevant. As is the type of wrench. We are talking about torque. The nut will be in the same place after we are done with all this regardless of how we applied the torque. The question is how did we measure the torque on the nut. We are measuring the torque 3" away from the nut and that is what causes all the assumptions to change.
I must admit.............I'm ready to go out to the garage, rig up a three inch extension; torque the nut to 80 ft. lbs.; then add one foot, change the setting to 88. whatever.........and see if the nut is still at the "click" setting. If it so, then it's so.
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  #194  
Old 02-16-2012, 03:06 PM
Birkelbach Birkelbach is offline
 
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Quote:
Originally Posted by L.Adamson View Post
When you actually explain the compressed spring characteristics, instead of just repeating the laws of "beam" physics, then I'll be much more interested in what's said. Up to this point.................all I'm hearing is.. "because" it's written, and no actual explanation. I just figure that everyone here so far, doesn't really know...
Seriously!? This is elementary, first year engineering school stuff. It's not complicated and the fact that we are still having the discussion is becoming laughable.

Quote:
I want to know, the exact workings of a compressed spring/pawl system, compared to physics and calculations derived for a beam type torque wrench. And yes, this applies to use with an extension.
None of these physics are derived from a beam type torque wrench. The measurement method has no bearing on the physics. If your physics are dependent on how you measure the parameters then there is something seriously wrong with your assumptions.
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  #195  
Old 02-16-2012, 03:07 PM
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Sparky Sparky is offline
 
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Allan,

I think your wrench (and other products) are great innovations, and I wish you a lot of success. However, due to the safety factor of proper torque values, especially on a propeller, I would advise you to simply instruct people to follow the instructions in AC-43.13 for using a 3" extension on their torque wrench instead of telling them to use a constant multiplier of 0.8. Just my $.02.
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Last edited by Sparky : 02-16-2012 at 03:21 PM.
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  #196  
Old 02-16-2012, 03:31 PM
CMW CMW is offline
 
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Default One last attempt

Larry,

I'll try one more way to explain it.

Let's assume the "clicker" torque wrench is 2 feet long and the extension is .25 feet long (3").

Now put the extension on the torque wrench and you have 2.25 feet from the handle to the bolt. If you want 99 foot lbs (to make the math cleaner) at the bolt you need 44 lbs applied normal to the handle (44lbs x 2.25ft). The wrench would click at 88 ft-lbs (44lbs x 2ft).

Now leave the wrench at 88 ft-lbs and move your hand to the middle of the wrench (1 foot from the handle). Now it takes 88 lbs to get the wrench to click but the torque on the bolt is now 88 lbs x 1.25 ft= 110 ft-lbs.

Leave the wrench at 88 ft-lbs and add a 1 foot cheater to the handle. Now, it takes 29.3lbs (88/3) normal to the cheater to get the wrench to click but the torque on the bolt is now 29.3lbs x 3.25 = 95.3 ft-lbs.

The setting on the torque wrench indirectly measures the force your applying at a distance from the end of the wrench. If you're using a socket or an extension at 90 degrees to a clicker wrench then where you grab on the wrench doesn't matter much (although in reality it does introduce small errors if you don't grab the handle). But with an extension in line with the wrench, where you grab is critical to get a known torque at the bolt.

That's it for me.......
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  #197  
Old 02-16-2012, 03:36 PM
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Quote:
Originally Posted by Mike S View Post
Bravo Mike!!!!
This is the best post so far!
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  #198  
Old 02-16-2012, 03:39 PM
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Quote:
Originally Posted by CMW View Post
That's it for me.......
Good...

Because I'm aware of everything you just said. But, it doesn't explain, what I'm looking for.

I've spent the last two days, scouring the Internet for the exact info I want. I've linked to numerous calculators. I don't need to hear anymore ...re quoting of the same numbers.
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  #199  
Old 02-16-2012, 04:01 PM
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If we aren't careful here Delta-Romeo is going to change the posting rules, No Religion, Politics or Torque Wrenches. Thanks Guys, Allan
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  #200  
Old 02-16-2012, 04:44 PM
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Quote:
Originally Posted by Mike S View Post

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