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- Measure the dimension of the specimen using ruler and caliper.
- Fix the shaft at driving end and other end to bearing block and tighten it.
- Switch on the speed control and rotate the control knob slowly in a clockwise direction until the first natural frequency is reached, which is indicated by the formation of a single bow as shown in Below Fig. When the speed is increased further the shaft begins to vibrate violently as it nears the critical speed.
- Once the critical speed is passed the shaft restabilizes and on further increase of the speed the second natural frequency is reached which is indicated by the formation of a double bow as shown in Below Fig.
- Measure the speeds of rotation of the shaft at its first and second natural frequencies directly with the Tachometer
- Measure the speeds three times and use the average value for the calculations
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