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Old 09-03-2003, 10:49 PM   #1 (permalink)
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Torque Wrench Questions?

In the directions that came with my Torque Wrench it says that adding an extension to the socket of the Torque Wrench increases torque to the bolt. Is this true?

please let me know thanks
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Old 09-03-2003, 11:10 PM   #2 (permalink)
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Torque Wrench Questions?

i would say yes, because of the angle bind, just try and hold it with your other hand, but that wont really work either, i dont think it should make a big difference as you are not working on a spacecraft, should be close to your settings, just double check after a week of running if this is engine related.
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Old 09-04-2003, 03:10 AM   #3 (permalink)
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Torque Wrench Questions?

It is true. Sometimes you gotta do what you gotta do but it's always best to avoid any extensions or adapters on a torque wrench.

I do some experiments with mine to get a ballpark idea of how far off it got with the extensions / adapters versus without. Then, just compensate up or down when doing the real work.
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Old 09-04-2003, 05:05 AM   #4 (permalink)
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Torque Wrench Questions?

They are really refering to adding an extension to the handle of the torque wrench. Let's say the handle, or grip, is 24" away from where the socket is attached. If you set it to 50 ft-lbs you are supposed to put all the force only on the handle. If you add an extension making the grip 36" away, you are really going to mess up the torque reading.

They are correct, though. If you put a socket extension on, the torque reading theoretically should be the same, but will be off a tiny bit. But it will be nothing compared to what I described above.
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Old 09-04-2003, 06:41 AM   #5 (permalink)
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Torque Wrench Questions?

A torque wrench should be exercised 3 or 4 times at the set rate before use. Just set the torque on the handle and lighly clamp it up in your vise by the square drive. Now click it 3 or 4 times. Ready for use.
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Old 09-04-2003, 11:15 PM   #6 (permalink)
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Torque Wrench Questions?

Ye gods guys, a STRAIGHT extension will NOT affect torque readings. However, if you use an offset adaptor on the end it will. Extending the handle will have NO affect on the reading.
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Old 09-04-2003, 11:51 PM   #7 (permalink)
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Torque Wrench Questions?

Quote:
On 2003-09-04 23:15, DblADigger wrote:
Extending the handle will have NO affect on the reading.
Agree - an extension on the handle wont change the torque at the head of the wrench, it will only lessen the load on your arm, require less effort to create the same amount of torque. Similarly, it will be physically a little harder to create torque with a long extension from the socket to the head of the wrench because you're going to lose quite a bit of the force you're applying to the long legs of that 90* angle (creating a lot of lateral force on the extension, "angle bind" like said earlier) but I'm pretty sure the actual torque reading in the head of the wrench should still be the same.

[ This Message was edited by: 69convert on 9/5/03 11:53am ]
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Old 09-04-2003, 11:56 PM   #8 (permalink)
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Torque Wrench Questions?

So, DblADigger adding an extension to the socket of the torque wrench will not affect the torque reading?
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Old 09-05-2003, 02:32 AM   #9 (permalink)
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Torque Wrench Questions?

My Craftsman torque wrench's instructions say it's the handle extensions that WILL alter the reading and should not be used. Same altered readings are true of offset extensions on the drive head, but those can be compensated for with experimentation.

It also goes on to say that socket extensions that extend directly under the drive head WILL NOT alter the reading.

But, adapters or extensions can have lots of slop in them and allow the bolt / nut to get out of line with the drive head, effectively altering the reading. The U-joint or 3/8" adapters I use do have a definite affect on my torque wrench readings.

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[ This Message was edited by: kewolfe on 9/5/03 2:37pm ]
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Old 09-05-2003, 04:25 AM   #10 (permalink)
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Torque Wrench Questions?

i never really heard about things changing with torquing bolts down using with extention until i worked at a navy shop.

but the navy mechanics i work with say that if your using an extention on the socket, it'll actually lessen up the torque a lil bit. i would believen that theory because i was torquing down a intake manifold on a motor i was putting together a month ago and i torqued it down to specs (which it was 23-25lbs) with a 6 or a 9 inch extention. i went over all the bolts 4 times total. i torqued the manifold down to half of the 23, then to 23 and went over 2 more times. i then took off the extention and just used a 1/2 inch socket with no extention and the bolts actually turned more. i think it was roughly 1/4-1/3 more. when i torqued down to 23 and i went over them the second and third time the torque wrenched clicked immediately.

i think i did it right (almost positive) cuz the motor is now running great with no leaks or anything.

does this sound weird? if i am reading correctly the first posts says adding a extention to the socket increases torque. like you set it at 20 and it's torquing at 22. i am experiencing the opposite.

correct me if i am wrong. i'm always willing to learn new things. this is just what i'm experiencing and hearing.
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Old 09-05-2003, 07:36 AM   #11 (permalink)
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Torque Wrench Questions?

An extension of the length of the torque wrench from the grip out won't have any affect on the reading as previous described. You are merely adding leverage. And you need it when you are torquing down the head bolts on a BBF at 140 ft/lbs. You have a 'pivot point' on a torque wrench where the length is known between it and the socket. The change in torque value occurs when the extension changes the position of this 'pivot point'.

The addition of a socket extension such as a 6" or 9" or even 12" adds rotational (torsion) error to the torque values. In most cases not too much, but as the extension gets longer, more is induced. This extension is the same principle used by Chrysler on their torsion bar front ends.

Adding a length extender to the socket end will vary the percentage of the torque reading by it's length in a ratio to the length of the torque wrench between the socket and the 'pivot point'. This can be seen if you put two toque wrenches together at the socket end and then set the torque for 20 ft/lb on each wrench. You total torque wold be the same as setting one wrench to 40 ft/lbs.
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Old 09-05-2003, 09:02 AM   #12 (permalink)
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Torque Wrench Questions?

I guess Craftman and other companies that say adding a handle extention will change the torque readings don't know what they are talking about.
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Old 09-05-2003, 09:17 AM   #13 (permalink)
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Torque Wrench Questions?

This is an interesting link - shows graphically why an extension from the drive end, or the rachet head, can increase torque, but not by extending the handle.

http://www.specialpatrolgroup.co.uk/...ue/torque.html
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