SM0486
b. Torque tester (models 71, 73, and 75) operating principle.
The torque
tester's principle of operation is based on a geared-down pendulum rather than
springs; it is geared down through a gear segment and a pinion mounted in life-
sealed roller bearings. The torque applied to the input segment transmits movement
to the pendulum which in turn moves a stay-set indicator over a scale.
The
trigonometric scale is calibrated in both inch-pounds and foot-pounds converted
from the angle through which the pendulum is moved. The direct readings obtained
are accurate within 2 percent. The reading of the stay-set scale is compared with
the torque wrench reading to determine the accuracy of the torque wrench scale
reading.
c. Torque tester application. Review some procedural principles you may have
applied on torque wrench testing and add such as are necessary for you to advance
to the technician level. The primary application of the Sweeney torque tester is
illustrated in Figure 8. This illustration shows how torque wrenches are checked
using any one of the three models of torque testers.
Figure 8.
Torque Tester Application
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