THK’s LM Guide Actuator SKR20 series represents a sophisticated integration of linear motion technology, combining a Caged Ball LM Guide Actuator with a motor wrap, long nut, and block assemblies (Types A and B) with protective covers. This design centers on the caged ball retainer system within the LM guide, which precisely positions steel balls in a non-recirculating pattern to minimize friction, reduce heat generation, and eliminate ball-to-ball contact. The actuator incorporates a precision-ground shaft with a long nut for efficient force transmission, while the block—available in standard (Type A) or flange-mounted (Type B) configurations—provides robust support and alignment. Protective covers shield critical components from contaminants, enhancing durability in harsh environments. The motor wrap interface allows seamless coupling with servo or stepper motors, enabling programmable positioning and velocity control.

Key technical features include the caged ball retainer, which ensures smooth motion by maintaining consistent ball spacing and reducing vibration. The SKR20 actuator offers high rigidity due to its optimized block design and four-row ball contact structure, capable of handling moment loads and off-center forces. Preload adjustments are available to minimize deflection under load, while the long nut design enhances torque transmission efficiency and backlash control. Lubrication ports facilitate maintenance, and the covers protect against dust, chips, and moisture, complying with IP ratings for industrial use. Materials such as hardened steel for raceways and aluminum alloy for blocks ensure longevity and corrosion resistance.

Performance advantages stem from THK’s engineering focus on precision and reliability. The caged ball system reduces noise levels by up to 10 dB compared to conventional designs, while lowering friction coefficients by approximately 30%, resulting in higher efficiency and extended service life. The actuator achieves positioning accuracy within ±0.005 mm/m and supports speeds up to 2 m/s with minimal maintenance intervals. Its compact form factor saves space in machinery layouts, and the modular design simplifies installation and replacement. Energy efficiency is improved through reduced power consumption, and the compatibility with various motor types allows customization for specific torque and speed requirements.

Typical applications span industries requiring precise linear motion. In industrial machinery, the SKR20 series is deployed in CNC machining centers for tool changers and axis drives, in semiconductor manufacturing equipment for wafer handling robots, and in packaging systems for repetitive pick-and-place operations. Automotive production lines utilize these actuators in welding gun positioners, assembly robots, and test rigs for component durability checks. Precision equipment applications include medical devices like MRI scanner beds, optical alignment systems in lithography, and coordinate measuring machines (CMMs) for metrology. The series’ resilience to contaminants and vibrations makes it suitable for food processing conveyors and automotive paint shops, where environmental challenges are prevalent. By delivering high load capacity, smooth operation, and configurable options, THK’s SKR20 LM Guide Actuator series addresses the demands of modern automation with reliability and precision.