Need to work out a balance tolerance?
Universal Balancing’s Tolerance Calculator utilizes the ISO Balance Quality Grade G and combines it with part specific information to calculate a balance tolerance.
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|
- 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.
- 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.
- Parts or process plant machines.
- Marine main turbine gears (merchant service).
- Centrifugal drums.
- 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.
- Gas and steam turbines, including marine turbines (merchant service).
- Rigid turbo-generator rotors.
- Machine-tool drives.
- Medium and large electrical armatures with special requirements.
- Small electrical armatures.
- Turbine-driven pumps.
- Tape recorder and phonographs (gramophone) drives.
- Grinding-machine drives.
- Small electrical armatures with special requirements
Spindles, disks and armatures of precision grinders.
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.