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Sensor I® Expert User Manual
Dynamic Audit:
The Dynamic Audit feature of the Expert wrench audits residual torque
currently on the fastener after relaxation and other effects have taken
place. On a very hard joint that is audited soon after tightening, this will
consistently equate to installation torque. On a very soft joint or a joint
audited long after the initial tightening, it may be considerably reduced.
Standard methods are open to variance from operator influence. Experienced
auditors try to overcome these difficulties by watching the socket very
closely and moving very cautiously. Other operators may have a tendency to
pull the wrench until the expected value is reached. Although that specific
bolt may end up with the correct torque, it does not tell Quality Control
about any possible problems that are occurring with the fastening
equipment on line.
The Expert wrench helps eliminate this operator influence by capturing the
residual torque after a very small angle is turned regardless of how far or
fast the wrench is pulled. In other words, all that is required is a quick pull
and the processor takes a "snapshot" of the dynamic torque at the pre-set
angle of turn.
To Dynamically Audit Residual Torque:
A table of audit angle values is provided for your convenience. The guiding
principle is to set a sufficient angle of turn to ensure the bolt threads are
moving when the torque snapshot occurs. The longer the fastener, the
greater the required angle.
To ensure that an accurate reading is received, the following procedure
should be followed: