Torque Device Question

[kwb]

dankeenan hit the nail on the head here - its all about static v. dynamic.

For hand tools - extension will not impact torque, it can have an effect if you have to measure angle. You may be deflecting (twisting) the extension but the forces do balance and if your wrench clicks at prescribed torque then you are good to go. If you have a torque then angle spec then the angle gauge needs to be at the socket end not ratchet end of the extension.

For Impact/Pulse tools - Yes Yes Yes. You can buy extensions that will set the torque on a fastener and they work pretty good if you don't have a torque controlled tool.

 

[A_Pmech]

Your fishing scale analogy was static. Tensioning a bolt is dynamic.

Wrong.

Authority: Mountz, Inc. 40-year-old manufacturer of manual and power torque application equipment, torque auditing equipment and torque analyzers:

"Static torque is torque that is applied by hand
Dynamic torque is applied by a power tool"

Link: http://www.etorque.com/html/tt2.htm

Zimmie's torque wrench, Snap-On model QD2FR75 is a hand tool. Therefore, it applies static torque.

If you still insist on asserting otherwise, then cite an authority as I have done.

Elroy is not going to try and educate the world. There are too many fools.

That remark is contentious, abusive, and did not respond to Zimmie's inquiry.

 

[Elroy]

You just don't stop do ya

Go away boy ya bother me

Go work on your saw and leave Elroy alone because you have no ******* idea what you're talking about.

 

[A_Pmech]

You just don't stop do ya

Go away boy ya bother me

Go work on your saw and leave Elroy alone because you have no ******* idea what you're talking about.

An ad hominem attack is precisely what I would expect to hear from someone who, when confronted with authoritative fact that conflicts with his own belief, would rather attempt to destroy someone's credibility than confront the facts.

You should be ashamed of yourself.

 

[Ryan]

I just sat here and read this whole thread... I'm amazed at the maturity level... or lack there of it... shown in this thread.

If you can't state an opinion without ******* on someone else, it's a clear and blatant display of your own intelligence level. Embarrassing.

Be respectful or don't post on this forum. That goes for everyone that talked **** on this thread. There won't be any more warnings.

 

[Charles (in GA)]

WOW, this discussion is pretty good and bad all at the same time. I will try to break this down since most of you are all saying the same thing. The main issue at hand is dynamics versus steady state... so here it goes:
If you have any motion (dynamics) in the system, then you can have an error induced in the fastener due to any relative compliance in the system (flex or twist in your tools). Since you will have energy stored in the system that may not get transferred, if the applied force it removed before the system comes to rest ( the torque stick example when used with an impact gun)
Once the system comes to rest (steady applied force with no motion) then the flex in the system no longer affects the applied torque versus the resultant torque (force at handle x moment arm = torque at nut).
Now with all that said, it is all academic since there is a very small possibility that you will be able to get to steady state or that you will flex the system enough to matter. So as a "rule of thumb" do not adjust your torque wrench setting for an extension. You really need to be more concerned about the lubrication you are using. Please follow the suggested torque with the suggested lubrication.
Cool discussion of theory versus application.

I also agree with Krusty, very well put.

Charles