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114
G1600
G6
30
G2
50
G6
.3
G2
.5
G0
.4
G1
G1
00
G4
0
G1
6
100000
10000
1000
100
10
1
30 5 100 2 3 4 5 1000 2 3 4 5 2 3 4 5 10000 100000
0.1
0.04
Maximum rotation speed in practical operation
P
e
rm
is
si
b
le
s
p
e
c
if
ic
r
e
si
d
u
a
l
u
n
b
a
la
n
c
e
According to JIS B 0513-1985, balance quality is defined as a
“quantity that shows the balance of a rigid rotor and is a product
between a specific unbalance and specified angular velocity.”
The following information (numerical values) on the rotor is
required to determine a permissible unbalance.
ò
Maximum rotation speed at which the rotor will be used
n
max
ò Rotor mass
m
ò
Rotor bearing position
ò Position of balancing plane
For more detailed calculations:
ò Position of rotor mass center (center of gravity) is required.
ò
Procedure for Deciding a Permissible Unbalance
1. A grade for balance quality is set based on the rotor type. The
smaller the grade for balance quality, the higher the balancing
accuracy. As explained in JIS, however, G1 and G0.4 require
particular caution.
2. The permissible specific residual unbalance
e
per
is calculated
based on the maximum rotation speed at which the rotor will
actually be used.
e
per
can be calculated from the following
calculation formula or from the diagram on the right.
3. The permissible specific residual unbalance is calculated
based on the permissible specific residual unbalance and rotor
mass.
Permissible specific residual unbalance U
per
=
e
per
m
[g · mm]
4. Distribute actually the permissible specific residual unbalance
to the unbalance of the balancing plane. (The distribution
calculation method varies in accordance with the relationship
among the bearing position, position and mass of balancing
plane and position of the center of mass. For more information,
refer to the explanation in JIS.)
Balance quality =
e · ω
ω
= 2 π
n
/60 =
n
/9.55
n
[min –1 ]
ω
[rad/s]
Balance quality =
e · n
9.55
ò
Recommended Grade for Balance Quality for Various Rotating Machines (JIS B 0905-1992)
Balance
quality
grade
Upper limit
of balance
quality mm/s
(
e
per
×
ω
)
Examples of rotor type
G4000 4000 ò Rigidly-supported crank shafting* 2 of low-speed diesel engine for ship* 1 with odd number of cylinders
G1600 1600 ò Rigidly-supported crank shafting* 2 of large two-cycle engine
G630 630 ò Rigidly-supported crank shafting* 2 of large four-cycle engine ò Rigidly-supported crank shafting* 2 of diesel engine for ship* 1
G250 250 ò
Rigidly-supported crank shafting*
2
of high-speed four-cylinder diesel engine*
1
G100 100
ò
Crank shafting of high-speed diesel engine*
1
with 6 cylinders or more for completed products of engines for automobiles, trucks
and rolling stock (gasoline or diesel).
G40 40
ò
Automotive wheels, rims, wheel sets and drive shafts
ò
Rigidly-supported high-speed four-cycle diesel engines*
1
with 6 cylinders
or more
ò
Crank shafting* 2 of (gasoline or diesel) engines
ò
Crank shafting for automotive, truck and rolling stock engines* 2
G16 16
ò
Drive shafts with special requirement (propeller shaft, Cardan shaft)
ò
Crusher parts
ò
Parts for agricultural machinery
ò
Parts
for engines (gasoline and diesel) for automobiles, trucks and rolling stock and crank shafting* 2 with 6 cylinders or more with special
requirement
G6.3 6.3
ò Equipment for process plants ò Main-engine turbine wheels for ships (For merchant marine) ò Centrifugal separator drums
ò
Papermaking rolls, printing rolls
ò
Fans
ò
Aircraft gas turbine rollers after assembly
ò
Flywheels
ò
Pump impellers
ò
Parts for machine tools and general machinery
ò
Medium and large armatures of motors with a shaft center height of at least
80cm or more without special requirement
ò
Small armatures mainly for high-volume production for use in an environment less
sensitive to vibration or with vibration isolation ò Parts for engines with special requirement
G2.5 2.5
ò
Gas turbines, steam turbines and main turbines for ships (For merchant marine)
ò
Rigid turbo generator rotors
ò
Memory
drums for computers and disc turbo compressors ò Main shafts for machine tools ò Medium and large armatures with special
requirement
ò
Small armatures (Except for G6.3 and G1 conditions)
ò
Turbine drive pumps
G1 1
ò Rotating parts of tape recorders and acoustic equipment ò Abrasive wheel shafts of grinding machines ò Small armatures with
special requirement
G0.4 0.4 ò
Abrasive wheel shafts, abrasive wheels and armatures of precision grinding machines
ò
Gyroscopes
* *1: Low-speed diesel engines are engines with a piston speed of 9m/s or less. High-speed diesel engines are engines with a piston speed of 10m/s or more.
* *2: Crank shafting is an entire unit consisting of a crank shaft, flywheel, clutch, pulley, damper, rotating part of a connecting rod and other parts.
*: The rotor mass of a completed engine product is the total mass of the entire crank shafting.
Technical Data
Balance Quality of Rotation Equipment