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High Rigidity
The LM guide differs from conventional LM guides by incorporating an outer rail structure, which improvesrigidity against excessive overhung loads even more.The LM rail cross-section has been made lighter in a wide U-shape structure to minimize deflection, allowing itto be used in cantilever or center impeller structures.
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(Table 1) LM Rail Cross-sectional Characteristics
4 Center of gravityAxis YAxis X ModelKR15KR20KR26KR30HKR33KR45HKR46
KR55
KR65
9.08
X l
Y Mass (kg/100 mm)Unit: mm
2 1.42 × 10
4 0.1040.26
0.39
0.5
0.66
0.91.261.5
2.31
l 6.1 × 10
3 6.2 × 10
4 1.7 × 10
4 1.5 × 10
5 2.7 × 10
4 2.8 × 10
5 (Figure 3)
6.2 × 10
4 3.8 × 10
5 8.4 × 10
4 8.9 × 10
5 2.4 × 10
5 1.5 × 10
6 2.2 × 10
5 2.3 × 10
6 H R 3 3 3 5 6 K K R 4.6 × 10 5.9 × 10
2 R K 2 6 X m) R 4 6 I = geometrical moment of inertia around axis X I
µ K K R 4 5 H K R Y = geometrical moment of inertia around axis Y
5 K R 5 K R 6 5 Displacement ( 0123456
2004006008001000
(Zero clearance)
Load (N) (Figure 4) Displacement of Model KR-A by Radial Load
High Precision
As the raceway has four rows of circular arc grooves that provide smooth motion by mere pre-load, highly rigid
guidance can be obtained. In addition, changes in frictional resistance resulting from load fluctuations are
minimized, allowing the KR to attain high-precision feed at the submicron level.
Rolling center of ball (Figure 5) Contact Structure of Model KR
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