Balancing - Two-plane

Two-plane balancing is defined in ISO 1925 as:

�A procedure by which the mass distribution of a rigid rotor is adjusted in order to ensure that the residual dynamic unbalance is within specified limits� (abridged)

As a rule two-plane balancing is required in all elongated, rigid rotors and all disc-shaped rotors where the permissible balancing tolerances cannot be achieved by single-plane balancing.

Typical rotors which should be balanced in two planes are: 

• paper machine rolls,
• centrifuge drums and decanter rotors,
• electric motors and generator armatures,                                                                            
• crushing and cutting rotors,
• machine tool spindles,
• grinding rolls,
• fans and blowers with elongated impellers and
• compressor rotors