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Balance quality and tolerances

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Categories: Rotor balancing basics
Balance Grade
[mm/s]
Machinery Examples
G 4000Crankshaft drives for large, slow marine diesel engines (piston speed below 9 m/s), inherently unbalanced
G 1600Crankshaft drives for large, slow marine diesel engines (piston speed below 9 m/s), inherently balanced
G 630Crankshaft drives, inherently unbalanced, elastically mounted
G 250Crankshaft drives, inherently unbalanced, rigidly mounted
G 100Complete reciprocating engines for cars, trucks and locomotives
G 40Cars: wheels, wheel rims, wheel sets, drive shafts
Crankshaft drives, inherently balanced, elastically mounted
G 16Agricultural machinery
Crankshaft drives, inherently balanced, rigidly mounted
Crushing machines
Drive shafts (cardan shafts, propeller shafts)
G 6,3Aircraft gas turbines
Centrifuges (separators, decanters)
Electric motors and generators (of at least 80 mm shaft height), of maximum rated speeds up to 950 r/min
Electric motors of shaft heights smaller than 80 mm
Fans Gears
Machinery, general
Machine tools
Paper machines
Process plant machines
Pumps
Turbo chargers
Water turbine
G 2,5Compressors
Computer drives
Electric motors and generators (of at least 80 mm shaft height), of maximum rated speeds above 950 r/min
Gas turbines and steam turbines
Machine-tool drives
Textile machines
G 1Audio and video drives
Grinding machine drive
G 0,4Gyroscopes
Spindles and drives of high-precision systems
Guidance for balance quality grades for rotors with rigid behavior
Permissible residual specific unbalance based on balance grade G and service speed, n