Torque wrenches, adapter, socket extensions-Read 1st post BEFORE Voting please!!

It's physically impossible for the extension to 'absorb' torque and give an incorrect reading. Even if the extension twisted and failed, it would just mean the torque wasn't applied to the bolt, but the reading the torque wrench read at the point of failure (prior to deformation) would be what was applied to the bolt.

 

I guess I could buy that

 

Didnt read all but...

How to test:

1: Torque with extension
2: Mark position with marker
3: Torque again without extension

As a control, do the above three steps but without the exntension in Step 1.

Do a couple of times and measure how much more it moves in the control and in the experiment group. Throw up a graph and prove your hypothesis right/wrong.

 

As has been answered, yes, he is full of it...to a point... If he were pulling at a 90 degree angle to the torque wrench, then yes. However if he were to pull at a 45 degree angle then the added length to the torque wrench would be 2.12 feet. (Using Pythagorean) So your question is somewhat vague.... Hehehe.

I am going to see if I can find that article online. Thanks for the additional supporting information.

Yep, Been doing this for as long as you have and we did the same test several times. I just can't seem to convince this guy on the other forum that he is wrong. Oh well. It's not even so much an effort to prove him wrong, but that he is giving out technical advice to other people asking for help, and his information is going to cause a problem.

 

Sorry, haven't had a girl petite enough to test the shaft's torsional limit.

Only if he's pushing on the rope.

 

OR, use a Skidmore machine that was actually designed to test this sort of thing.

 

Well some times you just can't fix stupid.. people get stuck on stupid and then preach it to others. You know as well as I do it does not change the torque. Some people just can't admit they are wrong. Even when someone like you or I who turns wrenches for a living tells them they are wrong. Most of the time it is some weekend warrior who thinks because he can change his oil he knows everything.

 

I was a little curious if the added length would be applicable, since it's not a rigid part of the torque wrench.

On the same note, say you pull at 50ft-lbs at a 45 degree angle. The actual torque applied to the wrench will be less than 50 since torque is measured tangentially. Some of the energy is directed outward, some is directed on the tangent. You may have to pull twice as hard. (with a rope)

 

Good point there. I am not sure how that would affect things. I don't see how you could actually pull by hand at a 45 degree angle. But yeah, if you could, then you would have to apply more hand force, but the torque wrench would still be delivering what it says. It is like the opposite of using a cheater pipe. While the torque wrench itself would still "click" at the correct torque, if you did use a cheater pipe on the shaft of the torque wrench, you wouldn't have to apply the same amount of force on it as you would if there were no pipe. That is assuming the pipe contact point was in the hand grip area I would assume. (Not 100% sure on that one)

 

Wouldn't matter. Click would still click when it's supposed to.

 

Thats too easy .

 

So I brought this up to my statics teacher today he made me feel rather stupid haha conveniently we went over force and moment. He explained the only way extensions could affect your work would be if there was lots of slop and the twist at the joint was taking your power instead of the socket so In in a real life perspective your torque will never be affected.

 

Hey Chris... check it out....

 

extensions shouldn't. however, dog bones, z-bars, or anything that changes the length will. tq wrenches are calibrated to the length of the tool itself.

 

no


Extension would have to plastically deform for it to "absorb torque".