# Residual Torque / Peak

This strategy evaluates the residual torque on a joint as the peak torque necessary to rotate the screw further.

Parameter | Description
--- | ---
Inspection Name | Name of the inspection.
Cycle start | Torque value from which the test operation starts. The Cycle start must be ≤ Final angle monitoring torque value, and must be ≥ smartHEAD Min load value. If Cycle start = 0, its value is automatically set to the smartHEAD Min load value.
Minimum torque | Lower torque limit value.
Maximum torque | Upper torque limit value.
Change screw | If the torque applied reaches this limit, the message Change screw is shown on the wrench display. The Change screw must be ≥ Maximum torque.
Target torque | Torque target value.
Torque tolerance | Torque tolerance that defines the maximum torque and the minimum torque according to the Target torque previously specified. Value is expressed in percentage (%).
Final angle monitoring torque | Torque value from which the angle measurement starts (usually set to 50% of the Target torque). If Final angle monitoring torque = 0, its value is automatically set Cycle start value.
Target angle | Angle target value.
Torque units | Measurement unit set for the joint linked to the inspection.
Control mode | Method to define the torque limits from the following options: Min/Max: the torque lower and upper limits are the values entered for the parameters Minimum torque and Maximum torque. Target/Tolerance: the torque lower and upper limits are calculated according to the values of the parameters Target torque and Torque tolerance.
Torque correction coefficient | When extensions are used, the wrench measurement must be compensated to show a more accurate torque value. To calculate the correction coefficient, please refer to How to calculate the Torque Correction Coefficient. When extensions are not used, Torque correction coefficient = 1.
Angle correction coefficient | When extensions cause additional wrench bending, the wrench angle measurement must be compensated to show a more accurate angle value. To calculate the correction value, please refer to How to Calculate the Angle Correction. When extensions are not used, Angle correction coefficient = 0.
Number of sample | Number of tests to run inside the inspection. Maximum value: 1000. If Number of sample = 0, the number of tests is infinite. If Number of sample > 1, batch result OK only if all tests are OK.
Ratchet time | Starts when the torque goes below the Cycle start without reaching the 3rd percentage value. This allows the operator to release the torque for a while and recharge during the tightening operation. Default value: 5 sec. Minimum value: 0.1 sec. Maximum value: 30 sec.

With this strategy, the breakaway point is not detected automatically. Therefore, this is a less objective method of evaluating residual torque. It may be used when the residual torque/time or torque/angle methods cannot be performed.

Torque vs Time

A | Minimum torque | B | Maximum torque
C | Torque peak |  |

Define the torque limits to get an OK result.

If the Target angle value is not specified, the angle result is marked as Not Applicable.

If a Target angle value is specified, the residual torque result is measured at the specified angle (starting from the Final angle monitoring torque) instead of the peak torque:

Torque vs Angle

A | Minimum torque | B | Maximum torque
C | Target angle |  |

During the test operation, LEDs, buzzer and vibration are activated as follows:

- LED:

  - White LED: activated when the Cycle start is reached.

- Buzzer:

  - The beep starts when the torque goes over the Cycle start value; the signal increases when the residual torque is detected / the tightening process has been completed.

- Vibration:

  - Starts when the residual torque is detected if a Target angle is specified.

At the end of the test operation, LEDs, buzzer and vibration are activated as follows:

- LEDs:

  - Green LEDs: torque result within the minimum and maximum limits.

  - Red LEDs: torque is outside the minimum and maximum limits range.

- Buzzer

  - Two beeps indicate the end of the operation; if the final result is in the red area, the signal in continuous.
    To stop the buzzer, start a new tightening operation or press a button on the tool controller.

- Vibration:

  - Stays active until the torque applied is released.