The equipment is in two parts and fits on a bench or desktop.
The tail end bearing slides in its housing to allow the shaft length to change as it whirls.
Similar to a beam on two simple knife-edge supports, both bearings allow free angular shaft movement (free ends condition).
A sensor at the driven end measures the shaft speed and sends its signal to the Control and Instrumentation Unit display.
The main part is a solid alloy frame that holds a variable speed motor which turns the horizontal test shaft.
Two bearings hold the shaft, one bearing at the driven end and the other bearing at the tail end of the shaft.
Two movable nylon bushes help to prevent the shaft whirling amplitude from reaching excessive levels.
A movable cord plate allows students to control the shaft in some experiments, to help reach the second mode whirl speed.
A removable safety guard with magnetic interlock surrounds the shaft and only allows the motor to work when fitted.
The separate Control and Instrumentation Unit contains the drive for the variable speed motor and a display to show the shaft speed.
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