# Y – Tighten to Yield

Tools
ES STR SL ST SR QST IXB

This strategy runs the tool with the speed in the forward direction until the yield point is detected. The yield point is found by monitoring the torque gradient from the point where the torque goes above the Trigger Torque level, calculated based on Torque and Angle distance measurements. The Angle distance parameter is set according to the specified hardness of the joint.

Set the Gradient angle window (for hard joint, for soft joint or for manually setting of the Angle window). If Manual is selected, the Angle Window must be set. A joint is considered Hard if the screw is tightened to its full torque and it rotates 30 degrees or less after it has been tightened to its snug point. A Soft joint rotates 720 degrees or more after it has been tightened to its snug point. The hardness parameter defines the Angle Window for the gradient calculation. The harder the joint - the smaller the angle window.

Parameter | Description
--- | ---
Gradient Angle Window | Specifies Angle Window: For Hard Joint: Angle Window = 1 deg. For Soft Joint: Angle Window = 20 deg. Manual: Manually set Angle Window.
Angle Window | Available when Gradient Angle Window is set to Manual. Must be > 0 and <= 100.
Trigger Torque | The angle measurement starts at this trigger. Must be >= 0 and < Tool MaxTorque.
Damping | Frequency in which the gradient is being calculated. Must be > 0 and < 100 and < Angle window.
Yield Point Percentage | Must be >= 20 %
Speed | Default: 60 rpm. Must be > 0.
Speed ramp type | Hard, soft, or manual. Default: Hard. If you select Manual, the Speed ramp field opens.
Torque Filter Type | The type of the filter: None: No filtering of the torque is used. The raw values are used as-is in the gradient calculation. Five-point: The torque value used in the calculation are filtered using a sliding average filter over 5 torque samples. Low pass: The torque values is filtered with a simple discrete Infinite Impulse Response filter. Sliding Average: The torque values used in the calculation are filtered using a sliding average filter over a Number of Samples specified by the use.
Cut-off Frequency | Needs to be specified when Torque Filter Type is set to Low pass: 20 Hz 40 Hz 90 Hz 200 Hz 600 Hz
Number of Samples | Needs to be specified when Torque Filter Type is set to Sliding Average: 2 4 6 8 16 32
Brake (Valid only for Power Focus 6000 Synchronized tightening, Power Focus 8 Synchronized tightening and Flex). | If On the tool will be stopped when the target is reached. If Off the program goes directly to the next step without stopping the tool.

Point and click on image to see more information:

A | Peak Gradient
B | Yield Point
C | Shut-off Point
D | Angle Distance
E | Torque Trigger