Circle-throw vibrating units rely on operating the screen component at a resonant frequency to sieve efficiently. While properly selected vibration frequencies drastically improve filtration, a deflection factor occurs as the vibrations displaces smaller particles. They do not properly pass through the screen due to excess movement. This is a property of the system's natural frequency. The natural frequency preferably vibrates at F n is 188(1/d) (cycles per min) where d = (188/F n) (inches). Static deflection corresponds to this frequency. Vibration isolation is a control principle employed to mitigate transmission. On circle-throw vibrating screens, passive vibration isolation in the form of mechanical springs and suspension are employed at the base of the unit, which provides stability and control of motor vibration. A rule of thumb regarding the amount of static deflection minimization that should be targeted with respect to operating RPM is provided in the table below.