SM0486
Figure 12.
Wrench Test Stop Adjustments
(4) After you have prepared the calibrator for a test you can proceed as
follows:
a. Place the torque actuator switch (see Figures 9, 10, and Table 2) in
the APPLY position while observing dial indicator movement.
b. At this time strain is transmitted through the torque cell to the
wrench under test. When the torque applied to the wrench reaches the preset value
of the torque wrench, an audible click should be heard.
c. Note the reading of the dial indicator at clickoff and move the
torque actuator switch to the RELEASE POSITION.
d. Compare the dial indicator reading with the scale setting of the
torque wrench under test.
The readings should be within the tolerances as
specified in the technical order prepared for the wrench tested.
9.
Proving Rings.
Proving rings are instruments which utilize the laws of
elasticity to measure force. They come in a variety of ranges and are used as a
transfer standard to calibrate torque wrench calibrators and other force measuring
devices.
Figure 13 illustrates a proving ring in place on the torque wrench
calibrator.
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