Torque, the force required for rotational motion, usually increases as temperature decreases. Grease is applied to tapered roller bearings (typically used in high load applications) to provide a low torque for a smooth motion and low energy consumption. This test measures the torque needed to start a roller bearing moving (breakaway torque) and the torque required to sustain the motion (running torque).
Using the apparatus as per the method, one bearing is packed with worked sample grease, placed in the spindle assembly and brought to the test temperature (-54°C). The spindle is then rotated as per the method (1 rpm for 5 minutes) and the breakaway and running torques are determined and reported.