The drive motor assembled with bearings under test was coupled to a similar motor through a rigid coupling. The test set-up is shown in Fig. 1.1. The coupled motor acts as a generator, while the drive motor, assembled with different kinds of bearings for investigation, acts as the motor under test. The speed of the motor was varied by changing the voltage and current input to the motor. The speed was monitored by a magnetic pick-up and displayed on a digital speed indicator. All the bearings were tested under coupled mode of operation for over-speed up to 2750 rpm up to maximum speed of 2275 rpm. Bearing geometrical parameters - bearing run-out, bearing clearance, swell, inner diameter of inner race and outer diameter of outer race - before and after assembly were also monitored in each test.
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