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Old 05-19-2006, 02:50 PM   #1
Psydotek
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Default Crowfoot + torque wrench = adjust torque?

Question...

When using a crowfoot wrench attachment with a torque wrench, should you adjust the torque settings higher/lower? Or is the difference negligible?

My educated guess would be to lower the number a bit because of the slightly longer lever arm...

[i ask because i'll be using it on very torque sensitive parts, flare nuts on an aluminum caliper]
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Old 05-19-2006, 03:10 PM   #2
sidewayz
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dont bother using it. if its a flare nut they dont need it. jsut tighten untill they are tight. Dont monkey it too much
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Old 05-19-2006, 05:30 PM   #3
sprior
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in theory, it's ok to use a crowsfoot with a torque wrench. Think of it as a couple. The torque on the bolt exerted by the crowsfoot must be the same as the torque on the crowsfoot exerted by the wrench since in the end there is no movement. There are some losses due to alignment accuracy dropping off, but it's a small difference.
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Old 05-19-2006, 06:38 PM   #4
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........

Last edited by Uncle Scotty; 02-06-2011 at 11:46 AM. Reason: file link broke
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Old 05-19-2006, 07:50 PM   #5
Psydotek
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Quote:
Originally Posted by Uncle Scotty
Nice pdf. Thanks!

[for those of you who didn't read it, it said no correction required for a standard crowfoot attachment.]
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Old 05-19-2006, 09:17 PM   #6
vorpalbunny
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If you are reeeeaaaalllly worried, just have the dogbone or crowsfoot 90 degrees from the wrench. (wrench perpindicular from crowsfoot--clear as mud).

Last edited by vorpalbunny; 05-20-2006 at 11:31 AM.
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Old 05-21-2006, 01:13 PM   #7
ICanRunLikeanSTI
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Default there is an equation for this

there is an equation for this... i forgot what it is but i know there is only... you only need it it you are extending the torque wrench. you dont need it if you are using the torque wrench and the crowsfoot at a 90 degree angle. the only reason i know this is because i am a helicopter crew chief for the US Air Force. let me know if you still need help. i can find out the equation for you if you still need it.
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Old 05-21-2006, 05:54 PM   #8
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...............

Last edited by Uncle Scotty; 02-06-2011 at 11:45 AM. Reason: file link broke
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Old 05-21-2006, 07:19 PM   #9
Psydotek
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Bah, when it came down to it, the crowfoot didn't even fit on the flare nut. The caliper body was getting in the way. Just had to use a plain flare nut wrench and go by feel. Here's to hoping there's no leaks.
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Old 02-04-2011, 04:07 PM   #10
DonWryBoutIt
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http://www.finishing.com/118/94_crows_foot_torque.shtml

I wrote up a post on this website that details the correction when using a crows foot. Right now it is the really long last post.

Cliff notes version... use the following equation.

Wrench torque = Torque Spec * (Wrench length / (Wrench length + Crows foot extension length))

*Torque Spec is the torque you are trying to achieve. Wrench torque is what you should set the torque wrench at. Crows foot extension is the length b/w the center of the torque wrench's drive and the center of where the nut/bolt will be in the crows foot.
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Old 02-04-2011, 04:13 PM   #11
rexspeedworthy
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Dude's been waiting five years to fix his car.
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Old 02-05-2011, 02:33 AM   #12
Psydotek
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Holy crzapples...

Well, um, no leaks yet.
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