Gravity Seperator is used for grading the cereals and pulses according to their specific weights. This seperation is effected by the help of air supplied by an aspirator and the vibration of the deck of gravity seperator. Light seeds with low germination power, weeds, stones, insect eaten seeds are seperated from the main product. Calibration of various kinds of materials with the same magnitude but different specific weights can be effected with this machine succesfully.