Faculty Advisor

Ault, Holly Keyes


Modern electric machinery requires the use of conductive ball bearing greases. The project sponsor, Axel Christiernsson International AB, has outlined requirements for a device to test grease under simulated conditions of an electric motor. The machine combines all of the requirements, including operating at speeds above 10,000rpm, measuring milli-Newton-meter range torques, and isolating an electric current to the test bearing. This report outlines the process to design a test rig to be constructed in August 2018. The final design consists of a belt transmission, ceramic support bearings, cantilevered test bearing in custom housing, an electric circuit, nut and screw loading, PT100 temperature sensor, and friction torque measurement by load cells.


Worcester Polytechnic Institute

Date Accepted

May 2018


Mechanical Engineering

Project Type

Major Qualifying Project



Advisor Department

Mechanical Engineering