Unbalance is the most common source of machine faults in rotating masses (i.e. fans, pumps, motors, chucks and spindles). Field balancing is the most economical method to correct unbalance in a completely assembled machine. The advantages of field balancing are:

• Life expectancy of a machine is maintained.
• Disassembly and transport of rotors is not required.
• Mountings and operating aspects are taken into consideration.
• Secondary damage is prevented