Dynamic Balancing Tolerance Calculator

Need to work out a balance tolerance?

Dynamic Balancing Tolerance Calculator utilizes the ISO Balance Quality Grade G and combines it with part specific information to calculate a balance tolerance.

Quality Grade (G)

Operational speed (RPM)

Component weight (Kg)

Tolerance (gmm)

ISO Balance Quality G Grade

ISO Balance Quality G Grades are used to calculate balance tolerances in conjunction with the rotor weight and service speed (RPM).

BALANCE GRADE G	EW 1] 2] MM/S	ROTOR TYPES – GENERAL EXAMPLES
G 40	40	– Car wheels, wheel rims, wheel sets, drive shafts. – Crankshaft-drives of elastically mounted fast four-cycle engines (gasoline or diesel) with six or more cylinders4). – Crankshaft-drives for engines of cars, trucks and locomotives.
G 16	16	– Drive Shafts (propeller shafts, cardanshafts with special req – Parts of crushing machinery. – Parts of agricultural machinery. – Individual components of engines (gasoline or diesel) for cars, trucks and locomotives. – Crankshaft-drives of engines with six or more cylinders under special requirements.
G 6.3	6.3	– Parts or process plant machines. – Marine main turbine gears (merchant service). – Centrifugal drums. – Fans – Assembled aircraft gas turbine rotors. – Fly wheels. – Pump impellers. – Machine-tool and general machinery parts. – Normal electrical armatures. – Individual components of engines under special requirements.
G 2.5	2.5	– Gas and steam turbines, including marine turbines (merchant service). – Rigid turbo-generator rotors. – Rotors. – Turbo-compressors. – Machine-tool drives. – Medium and large electrical armatures with special requirements. – Small electrical armatures. – Turbine-driven pumps.
G 1.0	1.0	– Tape recorder and phonographs (gramophone) drives. – Grinding-machine drives. – Small electrical armatures with special requirements
G 0.4	0.4	Spinles, disks and armatures of precision grinders. – Gyroscopes.
1] w=2xn / 60-N / 0, if n is measured in revolutions per minute and w in radians per second. To simplify: Tolerance = Component Weight [kg] x Quality Grade x 9549 / Operational Speed [RPM] 2] In general, for rigid rotors with two correction planes, one-half of the recommended residual unbalance is to be taken for each plane.