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Type SKR LM Guide Actuator with Caged Ball Technology T ype SKR LM Guide Actuator with Caged Ball T echnology

Nut blockBall screw shaft Ball retainersBallsLM rail

Figure 1 Construction of SKR-type LM Guide Actuator with Caged Ball Technology

Construction and Features

The SKR-type LM guide actuator with Caged Ball Technology is a compact actuator that places a nut block(s) thatintegrates an LM block and ball screw nut onto the inside of the LM rail of a U-shaped cross-sectional form. Moreover, the addition of the LM guide and ball screw sections with Caged Ball Technology allows the SKR-type LM guide actuator to achieve higher speed, lower noise, longer maintenance-free operation, and other features incomparison with the conventional KR-type.

1. Four-way Equal Load Rating

Each row of balls is arranged at a contact angleof 45 ° so that loads acting on the nut block in thefour directions (radial, reverse-radial, and two lat-eral directions) show the same rated load. Thus, the SKR-type LM guide actuators can be used in any position.

Figure 2 Load-carrying Capacity and Contact Angles of the SKR

2.High Rigidity

The adoption of the LM rail of a U-shaped cross-sectional form allows improved rigidity against moment

Axis YAxis X Center of gravity

Table 1 LM Rail Cross-sectional Characteristics

Unit:mm 4 ModelSKR33SKR465.35
X l
Y Mass:m(kg/100mm) × 10
4 3.52 × 10
5 0.611.26l 2.05 × 10
5 1.45 × 10
6 l
X = geometrical moment of inertia around axis Xl

Figure 3 Sectional View of LM Rail

Y = geometrical moment of inertia around axis Y

1