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CONFIGURING THE K-DUCER
ADVANCED TORQUE CONTROL STRATEGIES
Certain applications may require the use of tightening strategies more advanced than target
torque or angle control.
For these applications, the K-DUCER offers Running Torque Compensate, Prevailing
Torque, and multi-step program options. These terms are defined in the TERMINOLOGY
section.
These strategies are disabled by default, and if your application does not require them, you
may skip this section.
RUNNING TORQUE
Use running torque to apply the clamping torque, letting the closing torque vary
according to the running torque encountered and measured during the running torque
window.
The goal in this case is to apply a consistent amount of clamping force on the assembly, as
opposed to a consistent amount of closing torque.
If the running torque value is expected to be higher than the target clamping torque value,
the application may also require the use of prevailing torque phase, to be used in
conjunction with and during the running torque phase.
Seating point determination
First, it is necessary to understand the morphology and torque rate of the joint. Perform a
series of at least 10 tightening with a target torque near the maximum closing torque
allowed by the application (inclusive of running torque), without using any
running/prevailing/downshift settings. Follow all precautions necessary and note that this
may damage the assembly.
Note down the following information from torque and angle graphs and/or graph data
provided by the K-DUCER. You can also take advantage of the free K-Expand software to
readily analyze the graphs point-by-point.
• Seating point, in terms of both torque and angle, and of their variability
• Running torque
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