Quantcast Figure 4-5.  Torque Wrench - Straight Extension

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Figure 4-3.  Torque Wrench - Hand Position
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Figure 4-6. Torque Wrench - Angled Extension
TM 9-254 4-1. Torque Wrench - Continued d. Adapter Length Compensation (figs. 4-5 and 4-6).    When  adapters  are  used  that  rotate  about  a  center  not located  at  the  center  of  the  tang  of  the  torque  wrench,  it  is  necessary  to  compensate  for  the  additional  length.    An extension will always increase the capacity of the wrench. Figure 4-5.  Torque Wrench - Straight Extension (1) When an extension adapter is used as shown in figure 4-5. Let: F = Force (pounds) IT = Wrench length (inches) measured from the middle of handle to the center of the tang. IA = Extension length (inches) measured from center of socket to center of drive square. L = Effective lever length L = IT + IA Example: (figure 4-5) Assuming that the length of the torque wrench being used is 12 inches. The length of the extension is 2 inches. The torque setting of the wrench is 60 in. lbs.. The total torque applied at extension is 70 in. lbs. Equation TA = TT X L  or TA = 60 X 14  or  TA = 70 in. lbs. I T 12 Where:   TA = Torque applied at extension L = IT (12 inches) + IA (2 inches) TT = Setting of torque wrench (60 in. lbs.) IT = Wrench length (12 inches) 4-4

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