torque wrench

crowspond · Mar 21, 2019

around the stove talk argurment about putting a extension like half in drive on torque wrench will it alter mess up be incorrect torque value thanks crowspond

moresmoke · Mar 21, 2019

An extension will not change the torque value so long as you are applying a smooth even force. You get to bouncing on it and it will.

Also if you need to use something like a crow foot on it, setting it at a 90 deg angle to the wrench will give the right reading.

guido · Mar 21, 2019

Hello crowspond,

NO on the torque side, if straight down to the socket end, yes on the handle side,

Guido.

M-MAN · Mar 21, 2019

Lab tests say an extension doesn't affect the torque.

Personally I don't completely trust them. I will use up to a 4 in extension. I won't use anything longer because I have seen them twist & my mind tells me that twist will affect torque. Might be wrong but seeing the torque extensions tire shops use tells me I am probably right.

JF in MI · Mar 21, 2019

Agreed on both points

BigPapa53 · Mar 21, 2019

I don't think it will make a difference on either, an extension between the torque wrench and socket(I wouldn't go more than a 6") or a pipe on the handle. Test it and see.

Do we all agree that [b:8a9a297b75][i:8a9a297b75]IF [/i:8a9a297b75][/b:8a9a297b75]the extension would affect the torque, it would not not give it the full value? For example, using the extension, wrench set to 50ft/lb, it would only torque the fastener to, say, 47ft/lb.

So, find you a fastener you can torque with or without the extension, put the extension on and torque it down. Now, remove the extension and torque it again. If the fastener turns any more at all, then you could say it affects it. Same with the handle extension.

-Scott

dpendzic · Mar 21, 2019

it won't affect the torques values, even if the extension twists a bit--its simple statics--the torqued applied has to be resisted by the resisting torque

Janicholson · Mar 21, 2019

Jim's firm opinion. Any extension cannot change the applied torque IF the head of the wrench is held in alignment with the axis of the bolt/nut being tightened. A 30 foot extension makes zero difference. Angular stress from letting the extension centerline get off center of the fastener changes the lever length in unpredictable ways. The longer the extension the more likely the mechanic will hold the head in alignment. Any crowsfoot, or offset affects the reading, do the math. Worst math is if the offset is not directly away from or toward the handle. I just got done coaching 10 Engineering students on torque application and bolt stretch measurement lab exercises. Jim

MarkB_MI · Mar 21, 2019

> ...my mind tells me that twist will affect torque.

What is causing the twist? Torque. The torque that is applied to one end of the extension must be opposed by an equal torque at the other end. There is no loss.

Think of it this way: If you have a weight resting on springs, does it weigh less than if you were to weight it directly? Of course not. The compressed springs store energy, but they don't change the force of gravity on the weight. Likewise, when you apply a torque to a torsion bar, the torsion bar (in this case, a socket extension) stores energy, but it doesn't change the applied torque.

gab · Mar 21, 2019

I f it does screw the value up I'm guilty on a bunch of them.

moresmoke · Mar 21, 2019

The tire shop torque sticks work because they absorb the energy of the torque pulse. It is a dynamic situation.

Using a torque wrench is almost a static situation. So you can use the rule that a torque on one end of the shaft must be opposed by an equal torque on the opposite end.

Ken(Ark) · Mar 21, 2019

I have seen them twist & my mind tells me that twist will affect torque.

Your mind may be playing tricks on you . The torque at 90 degrees rotation would not be the same torque at 90 degrees rotation with a 12" extension . The torque at 100 lbs would 100 lbs with or with out the extension but the degree of angle you turned the wrench may be more with the extension , I am speculating , I am not an engineer , but I do like locomotives .

Janicholson · Mar 21, 2019

True. TURn of nut tightening is common, and used on "red iron" (structural steel) and many other applications. The nut is
torqued to a low (but compressed) specification, marked and turned an additional numbers of degrees, Jim

WGM · Mar 21, 2019

What is the definition of ?statics??

hd6gtom · Mar 21, 2019

After using a torque wrench thousands of times in the 22 years I had the tire shop I suggest you guys try it. Every wheel we put on cars and trucks was torqued.

4520BW · Mar 22, 2019

The extension will make no difference, I just tried it with a 6 and 12 inch extension. The test was done in a certified lab with ISO certified equipment.

crowspond · Mar 22, 2019

thanks for the replys will report to the bunch aroud the stove I personally did not think I would change it but thanks for the discussion crowspond

dpendzic · Mar 22, 2019

statics is the study of objects at rest while being subject to forces---as compared to dynamics which can be moving loads and moving objects. I had a full semester of study on each in college, but use statics mostly for design of structures and there loading

Dr. Walt · Mar 27, 2019

Look at the Torque Bars used on an Impact Wrench at a Tire Shop, they're basically just an Extension that is Calibrated for a specific torque.

1948CaseVAI · Mar 27, 2019

(quoted from post at 10:58:41 03/22/19) statics is the study of objects at rest while being subject to forces---as compared to dynamics which can be moving loads and moving objects. I had a full semester of study on each in college, but use statics mostly for design of structures and there loading

Wow - flash from the past. Prof. Ozawa at Kansas Univeristy taught us Statics one semester and Dynamics the next. We thought we were smart at the end of that Sophomore year . I had little clue what challenges the next years held!

torque wrench

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