The Rotopactor is a specially designed machine for manufacturing of the sand from grit. It is having a Rotating Disc, which throw the stone particles at vigorous velocity, which collides with annular rings. It breaks and rebounded in up ward direction. Again it falls down making a complete screen of stone particles. The new particles thrown from rotor, collides against these screen and breaks the stone into finer particles. The design of the Rotopactor disc and annular ring is of very special type, which give very efficient result. The maximum collision is stone on stone. In the process the final particle are of cubical shape and its sharp edges are rounded off. The stone particles are ejected from the Rotor due to centrifugal force at a particular angle, which strikes with the annular ring (anvil ring ) and diverted in circular path. The kinetic energy of the particles makes it move in a designated path. Next particles coming are colliding on these particles so as a results bigger particles breaks in to small pieces. These small particles roles around while moving in a circular path. The residual kinetic energy is utilized in giving good surface texture of the particle. The edges are rounded and surface became smooth. The bearing housing is a very unique design, with oil lubricating system. The complete weight of the Shaft and Rotor is counter balance by Lubricating oil. Complete system is floating in oil. There is very negligible frictional loss. This is a unique technology, Reduces frictional load. Circulating oil lubricates the bearings. The driven shaft is lifted due to oil pressure so the load on the bearings reduces. The heat generated in the bearings is reduced. The heat generated in the bearing is taken by Oil. Oil is cooled in a heat exchanger cooling system by circulating water. Water is cooled in a radiator with air circulating fan. A Temperature control unit is fitted with the machine, which restrict the machine to operate, if due to any reason the temperature of the cooling oil increases the scheduled limit. All this system assures a very long bearing life.