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Joint Simulator Washer Configuration Procedure
This procedure is used to obtain a washer stackup that will emulate the actual joint to be
tightened by the power tool. The goal is that the same number of degrees of rotation be
obtained on the joint simulator as was measured in the prior procedure for the same torque
values. A hex key of the same size as the female hex on the joint simulator, the dial- or
beam-type torque wrench, and a goniometer or other means of measuring the angle of rota-
tion of the bolt in the joint simulator will be needed.
1. Evaluate the washers needed to emulate the assembly joint.
a. If the degrees of rotation from Start to Finish from the prior procedure was < 10°,
use the hard joint cylinder in place of the washers for the balance of the procedure.
Skip the next step.
b. If the degrees of rotation were > 10°, use the washers.
2. Select a washer stackup providing the desired rotation obtained in prior procedure.
3. Install the washers on the bolt.
4. Install the bolt, loosely, in the body of the joint simulator.
5. Install the housing cover on the joint simulator.
6. Attach the joint simulator to the transducer using the method described earlier in this
chapter.
7. Use the methodology from the prior procedure to measure the degrees of rotation
obtained on the joint simulator.
8. Evaluate the result.
a. If the degrees of rotation are the same ± 10°, the joint has likely been suc-cessfully
emulated and can be used with this configuration. The joint simulator can be
removed from the hex key and is ready for use on the tester.
b. If the degrees of rotation are more than ± 10°, the joint has likely not been success-
fully emulated and cannot be used with this configuration.
i. If the rotation obtained in this procedure was greater than that sought, the wash-
ers stackup will have to be made shorter, emulating a harder joint.
ii. If the rotation obtained in this procedure was less than that sought, the washer
stackup will have to be made taller, emulating a softer joint.
iii. Remove the joint simulator from the transducer.
iv. Adjust the washer stackup as indicated.
v. Repeat steps 4 through 9 of this procedure.