STwrench User Guide Pset
9836 4134 01 Edition 2.9 137 (326)
6.7.2.5 Loose and Retight
Breakaway is by far the best and most commonly used method. But, when a bolt has been tightened some
time ago and there is rust or other conditions which could increase static torque, the suggested evaluation
method is to loosen the bolt and retighten it back to the original position.
Loosening: Retightening:
Specify the torque limits. The residual torque result is the torque at the end of the retightening operation
(measured at the target angle).
The Target Angle is usually set to a few degrees; if it is set too high, torque during the opening phase
could go under the cycle start value. In that case, the angle counting will stop, making the test impossible.
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:
Torque over Cycle Start value during loosening.
Retightening completed (within torque limits).
First, second, and third row of yellow
LEDs
Target Angle reached during loosening.
One signal when the Target Angle reached during
loosening.
One signal when retightening is completed (within the
torque limits).
Activated together with the green LED, and remains active
for one second.
To Next Page
Loading...
Need help?
General
