To make process of sieving simpler and quicker, Rotap sieve shaker is useful, this produces circular shaking of the sieves. At the same time the sieves are tapped. The mechanism for imparting circular action and topping is oil immersed in a tank and in motorized. The shaker can accommodate upto 7 nos. Sieves of dia 150mm or 200mm. Suitable operation of 230 V A.C. Single Phase.