Dynamic balance standards

Reasonable selection of balance accuracy grade and simplified calculation formula for unbalance amount. Reasonable selection of balance accuracy grade: Accuracy grade G, in g.mm/kg. Examples of rotor types: G630 – 630; crankshaft drives for rigidly mounted marine diesel engines； Crankshaft drives for rigidly mounted large four-stroke engines, G250; 250 crankshaft drives for rigidly mounted high-speed four-cylinder diesel engines, G100; 100 crankshaft drives for six-cylinder and multi-cylinder diesel engines. Complete (gasoline, diesel) engines for cars, trucks, and locomotives. G40 40 automobile wheels, wheel rims, complete wheels ； Driving components for engines used in cars, trucks, and locomotives. G16 16 crusher, parts for agricultural machinery ； Individual parts for (gasoline, diesel) engines used in cars, trucks, and locomotives. G6.3 6.3 Gas and steam turbine engines, including the rigid turbine engine rotors of marine (commercial) vessel main turbines ； Turbocharger ； Machine tool drive components ； Rotors for medium and large motors with special requirements ； Small motor rotor ； Turbopump. G2.5 2.5 Gear for the main turbine of seagoing vessels (merchant ships) ； Centrifuges, pump impellers ； fan ； Rotor components of aero gas turbines ； flywheel ； General parts of machine tools ； Ordinary motor rotor ； Individual parts of engines with special requirements. G1 1 Tape recorder and record player drive components ； Grinding machine drive component ； Small armatures with special requirements. G0.4 0.4 Spindle, grinding wheel, armature, and gyroscope of precision grinders. Simplified formula for calculating imbalance: M ----- Mass of the rotor, in kg; G ------ Precision grade selected, in g/mm/kg; r ------ Correction radius, in mm; n ----- Operating speed of the workpiece, in rpm; m ------ Acceptable level of imbalance, in g. m = 9549 × M × G / r × n

Take a look here; the standards for APIs can be found there. http://tieba.baidu.com/f?kz=314728174

The G2.5 grade mentioned refers to \"the gears of the main turbine in G2.5 2.5 seagoing ships (commercial vessels)\"； Centrifuges, pump impellers ； fan ； Rotor components of aero gas turbines ； flywheel ； General parts of machine tools ； Ordinary motor rotor ； Individual parts of engines with special requirements. "Really? Is it considered **standard**? Please have experts provide an explanation.:time:

Thank you for the information, hehe, learning!*