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TM-9-254 Gearcase Transfer M548 M548A1 (
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Use of a Torque Wrench
TM 9-254 CHAPTER 4 HAND TOOLS Section I. USE AND CARE OF HAND TOOLS 4-1. Torque Wrench. a. General.  The term torque as applied to hand tools that measure a turning force is actually incorrect.  "Torque measuring" or "torque indicating" would be more descriptive since all tools used to turn or twist are involved with torque. A simple screwdriver or wrench could be called a torque tool.  Torque is a turning or twisting force distinctly different from tension which is a straight pull. b. Determining  Torque  (fig.  4-1).    Simple  leverage  is  the  same  as  torque  and  both  are  measured  in  terms  of force and distance (distance is the length of the lever, force is the amount of pulling or pushing applied at the end of the lever).  Example:  length of the lever is10 inches, pulling pressure applied is 6 pounds. Figure 4-1.  Torque Computation (1) Let: T = Torque (inch-pounds, inch-ounces, foot-pounds, etc.) F = Force (pounds or ounces) L = Length of lever arm (inches, feet) LxF = T 10 inches x 6 pounds = 60 inch-pounds 4-1

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