|
| |
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
|
