Automotive Single Setting Torque Wrench with extension calculations

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SUMMARY

The discussion centers on the use of the Snap-on Industrial Brands 5T-I-SET break style torque wrench for achieving precise torque settings. The torque wrench is designed with a specific workhead distance of 2.5 inches from the torque centerline to the pin location. The user is attempting to torque a fitting requiring 16 in-lb using a wrench set to 30 in-lb and is debating whether to shorten or lengthen the extension. The consensus is that neither adjustment will effectively solve the issue, as altering the arm length will only change the force required to snap the wrench at its set torque.

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All,
I have been going back and forth in my head on if I should shorten my extension or increase it and I need a second opinion to straighten me out.

PN: 5T-I-SET
https://snaponindustrialbrands.com/...nt/PDF/Snap-on Industrial Brands CAT4 113.pdf

Its a break style torque wrench that comes with certain workheads that are 2.5" from torque centerline to pin location in the workhead (specified by the manufacturer)
https://snaponindustrialbrands.com/...nt/PDF/Snap-on Industrial Brands CAT4 114.pdf

I am trying to use a torque wrench with a larger setting (30inlb) to torque a fitting that requires 16inlb... I can't decide if I should shorten the 2.5" or lengthen it... I've convinced myself that both are right. I've drawn free body diagrams and all but I need some advice.

Anyone have a suggestion?
 
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In my view neither will help. Lengthening or extending the arm will only alter the amount of force required on the end of the arm to snap the wrench at its 30 in-lb setting.
 
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Likes Stephen Tashi
There is a calculator at: http://www.rv7.us/a_u-torquewrenchsetting.htm

To shorten the working distance, enter a negative number for the extension length. For instance if you shorten by 1" the wrench will read 26.7 in.lbs. when the fastener has 16 in.-lbs.

Cheers,
Tom
 

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