CEMB USA N300 - Manual (Page 80)

Grade
G ROTOR TYPE
mm/s
0,4 Gyroscopes
Spindles, discs and armature of precision grinders
Spinning spindles
1,0
Small electrical armatures with high level balancing requirements
Tape-recorder and phonograph (gramophone) drivers, cinema projectors
High precision grinding machine drives
Rotors of turbines and compressor of high-speed jet engines
Rotor of steam turbines with high level balancing requirements
2,5 Rotors of steam and gas turbines, of turbo-generators, of turboblowers and of turbine pumps
Merchant ship main turbines
Superchargers, supercompressor for aircraft
Medium and large electrical armatures with high level balancing requirements
Small electrical armatures with a reasonable level of balancing requirements, for high quality domestic electric appliances,dentist’s
drills, aerosols
Small electrical armatures not included in the conditions specified for Grade 6.3
Machine-tool drives
Fans for air-conditioning in hospitals and concert halls
High speed reduction gears (over 1000 rpm) for marine turbines
Disc and drums of computer memories
6,3 Small mass produced electrical armatures in applications where they are not sensitive to vibrations or with antivibrating mounting
Medium and large electrical armatures (with shaft height at least 80 mm) without any special requirements
Machine tools and components of machine tools and of machines in general
Fast moving weaving and spinni ng looms, plaiting machines,
centrifuge drums (creams separators, cleansing plants, washing
machines)
Hydraulic machine rotors
Fly-wheels, fans, centrifugal pumps
Reduction gear for merchant navy marine propulsion turbines
Cylinders and rollers for printing machines
Gas turbine rotors for the aeronautical industry
Separated components of engines under special requirements
16 Drive and cardan shafts with high level balancing requirements
Parts for agricultural, grinding and threshing machines
Motor parts for vehicles, commercial vehicles and locomotives (petrol or diesel drive)
Crankshafts complete with fly-wheels and clutches with 6 or more cylinders with high level balancing requirements
Drums for slow centrifuges
Propellers for light boats (motor boats. hydrofoils)
Wheel-rims for car and motorbikes
Normal drive pulleys
Large cylinders for paperworks
Single-piece tools for wood-working machines.
40 Wheels and wheel-rims for cars
Drive shafts and complete axles for vehicles
Crankshafts complete with fly-wheels and clutches for 4-stroke engines with 6 or more cylinders mounted elastically, with piston
speed greater than 9 m/s
Crankshafts complete with fly-wheels and clutches for car, lorry and locomotive engines
Drive shafts for pulleys
Multi-piece tools wood-working machines
100 Complete crankshafts for diesel motor of six or more cylinders with a piston speed greater than 9 m/s
Complete engines for vehicles and locomotives
Crankshafts for 1, 2 or 3 cylinder engines
250 Complete crankshafts for rigidly-mounted, 4 cylinder diesel engines: with piston speed greater than 9 m/s
630 Complete crankshafts for large rigidly-mounted, 4-stroke engines
Complete crankshafts for elastically mounted marine diesel engines
1600 Complete crankshafts for large rigidly-mounted, 2-stroke engines
4000 Complete crankshafts for rigidly-mounted marine diesel engines, with any number of cylinders, with a piston speed lower than 9 m/s
BALANCE QUALITY GRADES FOR VARIOUS GROUPS OF ROTORS
Note: The rotor classes in italics are not included in the ISO standards, but have been added by the Author.