Balancing is an operation whereby the mass distribution of a rotating body (rotor) is altered to minimize vibrations at the support bearings. An unbalanced rotor will cause vibrations and stress in the rotor itself as well as in the supporting structure. Rotors are balanced to achieve one or more of the following:

• Increase bearing life.
• Minimize vibration.
• Minimize audible and signal noises.
• Minimize operating stresses.
• Minimize operator annoyance and fatigue.
• Minimize power losses.
• Increase product quality.