Cam-over strategy
This strategy is applicable to a wrench or screwdriver with clutch technology that "slips-free" when the set torque is reached, preventing under and over tightening.
The click wrenches with clutch technology are defined as setting torque tools (Type II by standard ISO 6789).
The slip-wrench test provides the maximum torque measured during the test.
The parameter that characterize the peak point detections is:
End cycle time: it defines the end of the test. When the torque goes and remains below the transducer minimum load (which is normally the 5% of the transducer full scale) for the given timeout, the test ends.
If the torque goes over transducer minimum load before the timeout, the test continues. The test ends when torque remains under the transducer minimum load for the timeout.
Torque vs time A
Transducer min load
B
Transducer full scale
C
Timeout
