Torque wrench calculations - Road Star Warrior Forum : Yamaha Star Warrior Forums

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Old 05-13-2008, 10:34 AM   #1 (permalink)
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Default Torque wrench calculations

I heard a while back the formula for calculating the correct torque when using extensions but I can't remember it. Does anyone know how much you need to increase your torque when you have to use an extension on the torque wrench? I think it has something to do with the added flex between the wrench and the socket. ex: 1 ft# per inch of extension........thanks. I want to be sure I am torquing to the right specs.
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Old 05-13-2008, 11:02 AM   #2 (permalink)
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Default Re: Torque wrench calculations

I've never heard of extension bars flexing I use the same torque spec even when using extensions. I'd be interested to hear different.
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Old 05-13-2008, 01:28 PM   #3 (permalink)
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Default Re: Torque wrench calculations

Quote:
Originally Posted by warrior04


I heard a while back the formula for calculating the correct torque when using extensions but I can't remember it. Does anyone know how much you need to increase your torque when you have to use an extension on the torque wrench? I think it has something to do with the added flex between the wrench and the socket. ex: 1 ft# per inch of extension........thanks. I want to be sure I am torquing to the right specs.


I think that only applies when you're working under a shade tree, or somewhere south of the Mason Dixon line.
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Old 05-13-2008, 01:34 PM   #4 (permalink)
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Default Re: Torque wrench calculations

I represent that remark! I did not know if that was true or not, I just wanted to be sure....thanks y'all.


[
Quote:
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I think that only applies when you're working under a shade tree, or somewhere south of the Mason Dixon line.
I think that only applies when you're working under a shade tree, or somewhere south of the Mason Dixon line.
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Old 05-13-2008, 02:01 PM   #5 (permalink)
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Default Re: Torque wrench calculations

The torque reference chart that hangs in my backyard reads like this.


1> You tighten that'un yet


2> That'uns tight


3> Way tight


4> Way Fackin tight


5> Who the fack tightened this fuggin thing? Arnold??


6> That fugger's not commin off


and


7> Get the torch!
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Old 05-13-2008, 02:12 PM   #6 (permalink)
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Default Re: Torque wrench calculations

Quote:
Originally Posted by warrior04


I heard a while back the formula for calculating the correct torque when using extensions but I can't remember it. Does anyone know how much you need to increase your torque when you have to use an extension on the torque wrench? I think it has something to do with the added flex between the wrench and the socket. ex: 1 ft# per inch of extension........thanks. I want to be sure I am torquing to the right specs.


Using an extension on a torque wrench only REDUCESthe force you must apply on the handlein order to generate a given torque. For instance, if you are torquing something to a certain spec, and you add an extension that makes thehandletwice as long, then the force you need to apply is reduced by half. Flex in the handle+extension doesn't really enter into it because you are measuring the torque at the head.
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Old 05-13-2008, 02:14 PM   #7 (permalink)
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Default Re: Torque wrench calculations

Quote:
Originally Posted by Bladerunr


The torque reference chart that hangs in my backyard reads like this.


1> You tighten that'un yet


2> That'uns tight


3> Way tight


4> Way Fackin tight


5> Who the fack tightened this fuggin thing? Arnold??


6> That fugger's not commin off


and


7> Get the torch!





Are those metric or SAE values?! LOL
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Old 05-13-2008, 02:28 PM   #8 (permalink)
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Default Re: Torque wrench calculations

SRW





























Society of Redneck Wrenchers
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Old 05-13-2008, 02:39 PM   #9 (permalink)
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Default Re: Torque wrench calculations

Here's a charthttp://www.specialpatrolgroup.co.uk/...ue/torque.htmlif you use a tool like this as an extension adapter http://rswarrior.com/forums/p/20933/325250.aspx#325250. In the enclosed photo it's being applied at a right angle which doesn't require a multiplier.

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Old 05-13-2008, 03:03 PM   #10 (permalink)
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Default Re: Torque wrench calculations

Talking with the engineer that works for me he says if you have a 3/8's torque wrench with a 3" extension it will infact increase the amount of ftlbs at the socket. If you have a range of say 50-60 ftlbs set it for the lower limit 50 and you will end up with an increase of a few percent. Of course the longer the extension the more the torque is multiplied.
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