Vibro Sifter Vibro separators are circular unitary gyratory screens used to separate mass composition of solids from solids, liquid from solid and for gradation of materials as per particle size, having very wide range applications. This is accomplished by vibrating the screens in three different planes along the vertical axis by means of a specially designed vibratory motor having off cantered weights at the top and bottom end of the motor shaft. The top weight causes vibration in the horizontal plane which causes the material to move across the screen towards the periphery. The lower weight acts to tilt the machine which causes vibration in the vertical tangential axis.