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SAMICK LINEAR BUSHING
- Load rating and Travel Life

The Load rating of SAMICK Linear Bushing can be affected by the balls orientation against the Load. The Basic Load rating in the table is the Load rating of Linear Bushing when 1 (one) Ball circuit are just beneath the load. As shown in Table, If the Ball are located on symmetrical position against the Load, the Load rating will be increased and the travel life will be extended

Load ratings and Orientation of Balls

Load ratings and Orientation of Balls
Orientation of Balls
No. of Ball Row 4 Row 5 Row 6 Row
Max. Load
Equation F = 1.41 × C F = 1.46 × C F = 1.26 × C
Max. Load
Equation F = C F = C F = C

Basic Dynamic load rating(C) and travel life

The travel life of a Linear Bushing is determined largely by the quality of the shaft. The Basic Dynamic load rating is maximum continuous load that can be applied to the Linear Bushing with 90% of reliability achieving after 50km traveling under normal conditions. The nominal travel life can be calculated by follow equation.

Practically, other factors (Hardness factor, Load factor, Contact factor, etc) will affect the life as followsPractically, other factors (Hardness factor, Load factor, Contact factor, etc) will affect the life as follows

Equivalent factor and Travel life

If a Linear Bushing or two Linear Bushings laid beside one another on one shaft, and the moment load is applied, calculate the Equivalent load.

If the moment load and the radial load are applied, the travel life can be calculated by the sum of the moment load and the radial load. From the above equations, the stroke and frequency are constant; the travel life can be calculated by following equation

Equivalent factor for Linear Bushing

Equivalent factor (K)
P/N 1EA 2EA P/N 1EA P/N 1EA 2EA
LM 5 1.253 0.178 LM 5L 0.223 LME 5 0.669 0.123
LM 6 0.553 0.162 LM 6L 0.201 LME 8 0.514 0.116
LM 8S 0.708 0.166 LM 8L 0.151 LME 12 0.389 0.090
LM 8 0.442 0.128 LM 10L 0.118 LME 16 0.343 0.081
LM 10 0.389 0.101 LM 12L 0.113 LME 20 0.291 0.063
LM 12 0.389 0.097 LM 13L 0.107 LME 25 0.209 0.052
LM 13 0.343 0.093 LM 16L 0.096 LME 30 0.167 0.045
LM 16 0.279 0.084 LM 20L 0.082 LME 40 0.127 0.039
LM 20 0.257 0.071 LM 25L 0.060 LME 50 0.105 0.031
LM 25 0.163 0.054 LM 30L 0.053 LME 60 0.093 0.024
LM 30 0.153 0.049 LM 35L 0.050      
LM 35 0.143 0.045 LM 40L 0.043      
LM 40 0.117 0.040 LM 50L 0.034      
LM 50 0.096 0.032 LM 60L 0.031      
LM 60 0.093 0.028          

Note 1) The equivalent factor for LMF/K/H, LMFP/KP/HP and SC types are same as LM type.
Note 2) The equivalent factor for LMF-L, LMK-L, LMH-L and SCW types are same as LM-L type.
Note 1) The equivalent factor for LMEF/K/H and SCE types are same as LME type.

Short stroke Applications

In applications when the stroke is short, the life of the shaft is shorter than that of the Linear Bushing. In short stroke applications, the required dynamic load rating must be multiplied by the shot stroke correction factor (Kc) found on Fig right side.

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