STwrench User Guide Pset
9836 4134 01 Edition 2.9 123 (326)
At the end of the tightening operation two more beeps inform the operator of the
end of the operation, and if the final result is in the red area, the buzzer signal
remains steadily ON.
Vibration
Activated together with the third row of LEDs, and remains active until the
torque applied to the wrench is released.
6.7.2 Quality Control Strategies
The quality control strategies are not the strategies used to tighten a screw; they are used to check
tightening operations already performed, by executing the residual torque check operation, or to study the
characteristics of a joint (Joint Analysis).
The strategies for evaluating residual torque can be divided in three main categories:
• Breakaway: This measures the minimum torque to rotate the screw further.
• Residual Torque Peak: This simply measures the peak of the torque necessary to rotate the
screw further. The operator must stop as soon as the screw starts rotating.
• Loose and Retight: This loosens the screw to a certain degree and measures the torque
necessary to retighten the screw to the original position.
The Loose strategy is normally considered a production strategy, but is available also in the quality
strategies. See the Loose chapter for more information.
The paragraphs below describe in detail how the STwrench performs these strategies.
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