Legend

Weight of the rotor - this is the weight of the rotor you are attempting to balance.

RPM of the Rotor - How fast the part turns when it is in service. Not to be confused with the balancing speed.

Correction Radius - how far from the center of the rotor where the correction weight will be added.

How Many planes - rule of thumb - if the part is more than 2" wide or if the rotor is more than 50% of the distance between the bearing points, it should be balanced in 2 planes.

Balance Quality - We have included 3 options for balance quality "1", "2.5" and "6.3". These tolerances are for rigid rotors and can be used, generally as follows -

"1" - Top grade for precision grinding applications or for small electrical armatures with special requirements.

"2.5" - Precision Grade applications such as gas and steam turbines, rigid turbo-generators, turbo-compressors, machine tool drives, medium and large electrical armatures and turbine-driven pumps.

"6.3" - General Grade applications such as parts of process machinery, centrifuge drums, fans, flywheels, pump impellers. Of course, these are general guidelines. You may decide that a particular rotor should be balanced based on its importance to an operation and costs of downtime.

This chart is intended to assist those who wish to establish a vibration tolerance and is intended to be a guide only. There are many specifications that are written for particular applications which are not addressed with this calculator. They should be adhered to.