Vibrating Machine is used for vibrating the mix in moulds at a frequency of 12,000 ± 400 cycles per minute.The vibrator is mounted over 4 coiled springs and the vibrations are developed by means of a revolving eccentric shaft. The centre of gravity of the vibrator, including the cube mould, is either at the centre of eccentric shaft or within 25mm below it. The simple design of the machine facilitates easy assembly and dismantling of thecube moulds.Concrete moulds are easily cast by using a tamping bar or a vibrating table. However air tapped in cement mortar paste can not be thus removed while casting cement mortar moulds. Easy method is to impart greatervibration of lesser amplitude to the mould while casting. This is achieved in a vibrating machine. Vibration machine is used for the preperation of mortar cubes for the determination of compression strength of ordinary and rapid hardening Portland cement, low heat portland cement, portland blast furnace cement and high alumina cements.
