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    UNIVERSAL BALANCING

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    Home Balancing Information ISO Quality Grades

    ISO Quality Grades

    Balance quality 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

    1

    - 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.