Circular Motion Screens are operated either by a single shaft vibrator or by a single unbalance motor. Due to the eccentricity of the shaft in the case of single shaft drive, a controlled circular motion is produced. In the case of a single unbalance motor drive, the circular motion is produced by the unbalanced weights on the rotor shaft. These screens have a slope varying between 15 and 25. They are commonly used with a combination of low amplitude of vibration and high frequency.