What is Rolling Torque?
Do you know what rolling torque is? Let's discuss it in terms of applications to get a better grasp on it. Put simply, it is the continuous rotational torque required to keep a component in motion. Rolling torque is a specification most commonly used to set proper bearing preload. Understanding rolling torque in automotive applications is critical for technicians because it directly impacts both assembly integrity and operational longevity.
Drivetrain Setup: Getting the Preload Right
In axles and transmissions, rolling torque is synonymous with turning torque, dynamic torque, or rotational drag. When measuring rotational drag in a differential, you are measuring the pinion bearing preload. This measurement ensures the bearings are seated with the exact amount of pressure required to eliminate axial play and prevent shaft deflection under load.
Before the ATECH Advanced, dial and fixed-beam style torque wrenches were required to measure dynamic torque, as standard split-beam, or “click,” style torque wrenches only measure static torque values. The new ATECH Advanced now incorporates all styles of torque wrenches into one tool.
Snap-on has built in a dedicated rolling torque feature into the new ATECH Advanced torque wrench. This new feature measures and displays the average and peak torque values recorded in operation. These can be internally stored and recalled from within the tool at any time. That means more applications with less tools. The ATECH Advanced incorporates all of the latest digital torque wrench technology into one convenient package, letting you get more done with one tool.
How to Enable Rolling Torque on Snap-on's ATECH Advanced Torque Wrench
1. Press and hold the enter button until you enter the menu
2. Scroll down to options
3. Hit Enter
4. Scroll to rolling torque
5. Hit Enter
6. Press the left arrow to get back to the measurement screen
7. Press the enter button until “Rolling Torque” is displayed at the top of the screen