ISO 21940 Grados De Balanceo G | Universal Balancing

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Guidance for balance quality grades for rotors with rigid behaviour.

BALANCE QUALITY GRADE G	MAGNITUDE e per Ω mm/s	MACHINERY TYPES – GENERAL EXAMPLES
G 4000	4 000	Crankshaft drives for large, slow marine diesel engines (piston speed below 9 m/s), inherently unbalanced
G 1600	1 600	Crankshaft drives for large, slow marine diesel engines (piston speed below 9 m/s), inherently unbalanced
G 630	630	Crankshaft drives, inherently unbalanced, elastically mounted
G 250	250	Crankshaft drives, inherently unbalanced, rigidly mounted
G 100	100	Complete reciprocating engines for cars, trucks and locomotives
G 40	40	Cars: wheels, wheel rims, wheel sets, drive shafts Crankshaft drives, inherently balanced, elastically mounted
G 16	16	Agricultural machinery Crankshaft drive, inherently balanced, rigidly mounted Crushing machines Drive shafts (cardan shafts, propeller shafts)
G 6,3	6,3	Aircraft 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 turbines
G 2,5	2,5	Compressors Computer drives Electric motors and generators (of at least 80 mm shaft height), of maximum rated speeds up 950 r/min Gas turbines and steam turbines Machine-tool drives Textile machines
G 1	1	Audio and video drives Grinding machine drives
G 0,4	0,4	Gyroscopes Spindles and drives of high-precision systems
NOTE 1 Typically, completely assembled rotors are classified here. Depending on the particular application, the next higher or lower grade may be used instead. For components, see clause 9. NOTE 2 All items are rotating if not otherwise mentioned (reciprocating) or self-evident (e.g. crankshaft drives). NOTE 3 For some additional information on the chosen balance quality grade, see Figure 2 which contains generally used areas (service speed and balance quality grade G) based on common experience. NOTE 4 For some machines, specific International Standards stating unbalance tolerances exist. NOTE 5 The selection of a balance quality grade G for a machine type requires due consideration of the expected duty of the rotor when installed in situ which typically reduces the grade to a lower level if lower vibration magnitudes are required in service. NOTE 6 The shaft height of a machine without feet, or a machine with raised feet, or any vertical machine, is to be taken as the shaft height of a machine in the same basic frame, but of the horizontal shaft foot-mounting type. When the frame is unknown, half of the machine diameter should be used.

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