STwrench User Guide Pset
9836 4134 01 Edition 2.9 129 (326)
6.7.2.3 Residual Torque/Angle
This strategy evaluates the residual torque on a joint, looking for the residual point of the Torque / Angle
trace.
Since the torque/angle trace is less dependent on the operator’s movements, this is a more objective
method than the Residual Torque/Time method for measuring the residual point of a wrench with a built-
in gyroscope.
As per the residual torque time, define the torque limits where the residual point is considered as OK in
the result.
The Start Final Angle, which must be greater than the Cycle start; defines the point from which the
STwrench algorithm starts analyzing the torque/angle trace. This is useful to filter all the noise that may
occur at low torque value, and that could be detected as a false residual point.
Torque result:
- If the residual point is detected, the result is associated with the residual point; the test is
OK if the residual falls within the limits.
- If the residual is not detected or the torque goes over the maximum torque, the torque
result is the maximum value.
Therefore, if the maximum value falls within the limit, the torque result is still OK, but
the overall result is marked as Not OK.
- If the torque goes over the Change Screw value, the residual is no longer detected and
the torque result is the maximum torque.
If the torque goes over the Change Screw value, a message is shown on the wrench display advising the
operator to replace the screw.
The STwrench LEDs, buzzer and vibration devices are activated as follows:
Breakaway = residual
Start Final Angle
Torque max
Torque max
Start Final Angle
Breakaway
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