CEMB USA N300 - Manual (Page 61)

Evaluation criteria
B - 1
Appendix B
Evaluation criteria
TABLE A
MACHINE CATEGORIES BY EVALUATION CRITERIA
Group
according to
ISO 10816
VDI 2056
MACHINES
I – K
Machine parts that are closely related to the machine as a whole during normal working
conditions. Grinding and boring machines. Electric motors (up to 15 KW) that need
good balancing, e.g. dentist’s drills, aerosols, high quality electromedical and domestic
appliances.
Jet engine turbines and compressors.
Fast compressors.
II – M Medium sized machines with electric motors from15 to 100 KW, without any special
foundations. Lathes. Milling machines. Machines and drives up to 300 KW with rigid
construction, without any parts with alternating movement, resting on their own
foundations. Mass produced electric motors with axis height less than 130 mm.
III – G The most common medium category for first approximation. This category includes
machines not found in other categories. Large machines with rigid, heavy foundations,
without any masses with alternating movement. Gas or steam turbines, turbo blowers,
large alternators. Normal motors in general and especially motors whose axis height is
from 130 to 230 mm. Rigid (class A) fans. Parts of machine tools.
IV – T
Large machines with low-rigidity foundations, without any masses with alternating
movement. Turbines, alternators, large motors, on light foundations or on board ship.
Electric motors with axis heights from 230 to 330 mm. Hydraulic machines, centrifugal
pumps. Normal fans on flexible structures (class B).
Turbine gears. High performance machinery: for printing, spinning or papermaking.
V – D
Machines with unbalanceable alternating masses, on foundations that are rigid in the
direction of the greatest vibrations.
Fans on vibrating-damping mounts (class C).
Motors with crankshafts with six or more cylinders on their own foundations. Piston
motors for automobiles, goods vehicles, transportation vehicles not set on insulators
during tests. Machinery with unbalanceable masses, such as weaving looms, skimmers,
centrifugal purification plants, washing machines if fitted to rigid baseplates without any
shock absorbers.
VI – S Machines with masses featuring unbalanceable reciprocating movement, mounted on
flexible foundations.
Machines with free rotating masses, having variable, non-compensable unbalances, with
flexible mounting, operating without rigid connections to other parts, such as: washing
machines, spin-dryer baskets, vibrating sieves, machines for fatigue testing of materials,
vibrating machines for technological processes, beaters for grinders, vibratory equipment.
Agricultural machines, mills, threshing machines.
Engines with 4 or more cylinders mounted on motor vehicles and locomotives.
Diesel engines with 4 or more cylinders.
Marine diesel engines.
Large two-stroke engines.