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Thread: Actual vs measured barrel torque question

  1. #1
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    Actual vs measured barrel torque question

    With a barrel wrench where the receiver hole for a torque wrench is 6" away from the barrel nut, is 30ftlbs measured really more at the nut? Are these tools are really measuring lbs at distances less than 1 foot?

  2. #2
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    You have to use the formula (you can google it) to get the exact torque.

    I can just eyeball it assuming the wrench is like most... DD, Standard armors wrench etc. where the offset is minimal compared to the length of my Torque wrench.

    There's a generous torque range on a standard nut. But on something like a VIS with 6000 series alluminum, you want to keep it near that 40 lb area.
    Last edited by markm; 11-28-12 at 14:08.
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  3. #3
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    I've not used a barrel nut wrench that has its driver socket 6" out but with that great of a distance the torque at the barrel nut will be roughly 50% higher than your torque wrench's reading. If you orient your torque wrench perpendicular to the barrel but wrench the reading will be accurate.
    Last edited by Eric D.; 11-28-12 at 16:54.
    B.A.S. Mechanical Engineering Technology

  4. #4
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    If you really want to get precise, take a look at this site for an extension calculator: http://www.belknaptools.com/support-...ns-calculator/

  5. #5
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    Turn the barrel nut wrench 90 degrees to the torque wrench and you'll be close enough to work
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    Thanks guys. Ill take it apart tomorrow and retorque it at 90 degrees.

  7. #7
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    Add the length of the torque wrench and the length of the extension. Divide by the length of the torque wrench. This gives the % increase of applied torque.

    6'' extension
    18'' torque wrench

    33% increase over the value indicated on the wrench.

    30 ft/lbs set on wrench gives 40 ft/lbs applied at fastener.

    24'' torque wrench, then a 25% increase in applied torque, or 37.5 ft/lbs.

    Not really advisable to offset extension to torque wrench if the range of travel of the tool is not limited.

  8. #8
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    May I ask why you feel it is necessary?

    Quote Originally Posted by Swstock View Post
    Thanks guys. Ill take it apart tomorrow and retorque it at 90 degrees.



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  9. #9
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    Way too much overthinking in this thread.

  10. #10
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    Silly question. I had an army armorer tell me once that they just wrenched it down tight, backed it off, did it again, backed off again, and on the third time, tightened it to line up the holes. Now maybe he just had a "feel" for it, but is that a valid way to tighten the nut?

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