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Hardness Factor (fH)
Temperature Coefficient (fT)
Contact Coeffcient (fc)
Load Coefficient (fw)
The shaft must be sufficiently hardened when a linear
bushing is used. lf not properly hardened, permissible
load is lowered and the life of the bushing will be
shortened.
If the temperature of the linear system exceeds 100℃，
hardness of the linear system and the shaft lowers to
decrease the permissible load compared to that of the
linear system used at room temperature. As a result,
the abnormal temperature rise shortens the rating life.
Generally two or more linear bushings are used on
one shaft. Thus, the load on each linear sysem differs
depending on each processing accuracy. Because the
linear bushings are not loaded equally, the number
of linear bushings per shaft changes the permissible
load of the system.
When calculating the load on the linear system, it is
necessary to accurately obtain object weight, inertial
force based on motion speed, moment load, and each
transition as time passes. However, it is difficult to
calculate those valuse accurately because reciprocating
motion involves the repetition of start and stop as well
as vibration and impact. A more practical approach is
to obtain the load coefficient by taking the actual
operatingconditions into account.
Fig.1 Hardness Factor
Fig.1 Hardness Factor
102030405060
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Raceway Hardness HRC
Hardness Factor f
1.0
0.9
0.8
0.7
0.6
0.5
250100 150 200
Temperature of Linear System
Temperature Coefficient f
Table 2 Contact Coefficient
Number of linear
systems per shaft
Contact coefficient fc
1
2
3
4
5
Table 3 Load Coefficient
1.00
0.81
0.72
0.66
0.61
Opearating Conditions
fw
Operation at low speed(15 m/min.
Or less) without impulsive shock
from outside
Operation at intermediate speed
(60 m/min. Or less) without
impulsive shock
Operation at high speed
(over 60 m/min.) With
impulsive shock from outside
1.0 to 1.5
1.5 to 2.0
2.0 to 3.5
The static frictional resistance of the KOLMB
linear system is so low as to be only slightly
different from the kinetic frictional resistance,
enabling smooth linear movement from low to
high speeds. in general, the frictional resistance
is expressed by the following equation.
The frictional resistance of each KOLMB linear
system depends on the model, load weight,
speed, and lubricant. The sealing resistance
depends on the lip interference and lubricant,
regardless of the load.
The ambient working temperature range for each
KOLMB linear system depends on the model.
Consult KOLMB on use outide the recommended
temperature range.
Temperature conversion equation
C=
F=
Using KOLMB linear systems without lubrication increases
the abrasion of the rolling elements, shortening the life
span, The KOLMB linear systems therefore require appro-
priate lubrication. For lubrication KOLMB recommends
turbine oil conforming to ISO Standards G32 to G68 or
lithium base soap grease NO.2. Some KOLMB linear
systems are sealed to biock dust out and seal lubricant in.
If used in a harsh or corrosive environment, however,
apply a protective cover to the part involving linear motion.
Frictional Resistance
F:Frictional resistance :Coefficient of friction
W:Load weight f:Sealing resistance
Ambient
Working Temperature
Lubrication and
Dust Prevention
weight. The sealing resistance of one linear system
is about 2000 to 500 gf. The coefficient of friction
depends on the load weight. Moment load. And pre-
load.Table 6 shows the coefficient of kinetic friction
of each type of linear system which has been installed
and lubricated properly and applied with normalload
(P/C=0.2)
Table 5 Coefficient of Linear System Friction (u)
Table 6 Ambient Working Temperature
Linear Bushing
LMLME LMB -20to80℃
Linear Bushing
LM-ALME-ALMB-A -20to110℃
Linear System
Type
Models
Coefficient of
Friction (u)
Linear Bushing
LMLME LMB 0.002 to 0.003
Linear System
Type
Models
Ambient
Working
Temperature
5
9
5
9
F= W+f
(F-32)
32+ C
3
2
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