# Loosening a Screw

By setting the loosening parameters, you can control the behavior of a loosening for a specific tightening program. Specify the loosening speed and torque to ensure that the screw is unscrewed as desired, so that the screw thread does not break, regardless of what tool is used.

A loosening is considered OK when Run-up torque is reached. Depending on variations in screw length, the system cannot determine when the screw has been run up completely. The operator will need to proceed with the loosening until it is considered finished.

The loosening is divided into normal loosening and TurboLoosening. The selection is made automatically based on tool capability and on the selected tightening strategy. TurboTight can achieve a much higher target torque and thus a normal loosening strategy is not sufficient. The TurboLoosening uses a pulsing strategy and is selected automatically, depending on whether the tool can support this.

Loosening

Loosening steps
Parameter name | Description
--- | ---
Start | Run at slow speed. If the measured torque is below the detection torque, go to the run-up step.
Loosening | For normal loosening: Run att slow speed until the measured torque is below the run-up torque, then proceed to the run-up step For Turboloosening: Loosen the screw by using as many pulses as needed until the measured torque is below the run-up torque, then proceed to the run-up step
Run-up | Run the tool at the loosening speed, as long as desired.

Loosening parameters
Parameter name | Description | Default value
--- | --- | ---
Loosening enabled | Selected by radio buttons. Off: Loosening is disabled. On: Loosening is enabled and additional parameters can be configured. | On
Detection torque | Selected by radio buttons. Auto: The value is set based on the tool type and the tool capability. On:The value is set manually. | 7% ToolMaxTorque
Detection torque | The minimum torque required to begin performing a loosening operation and produce a loosening result. | 3.5 Nm
Run-up torque | Selected by radio buttons. Auto: The value is set based on the tool type and the tool capability. On:The value is set manually. |
Run-up torque | When the torque falls below Run-up torque, the loosening is considered to be OK. Depending on variations in screw length, the system cannot determine when the screw has been run up completely. This is for the operator to decide. | 3.5% ToolMaxTorque