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SKR46

The THK LM Guide Actuator Caged Ball LM Guide Actuator SKR46 represents a significant advancement in linear motion technology, integrating a precision ball screw with a robust LM guide mechanism to deliver exceptional accuracy, rigidity, and load capacity in a compact, unified assembly. This actuator is engineered with a unique caged ball design within the LM guide block, where precision-engineered balls are individually retained in a polymer cage. This configuration drastically reduces friction and heat generation by minimizing ball-to-ball contact, allowing for higher operating speeds, reduced torque requirements, and significantly quieter, smoother motion compared to conventional recirculating ball designs. The elimination of ball-to-ball contact also prevents skidding and reduces wear, contributing to extended service life and consistent performance even under high-load, high-speed conditions.

Key technical features include the high-rigidity LM guide with four rows of load-carrying balls arranged in a Gothic arch groove profile, providing equal load capacity in all directions—radial, reverse-radial, and lateral. This ensures stable, precise linear guidance without deflection under moment loads. The integrated precision ball screw offers high positioning accuracy with lead errors as low as several microns per 300mm travel, backed by preloading to eliminate backlash and enhance repeatability. The actuator is available with various ball screw lead options to optimize for speed or resolution, and it can be supplied with pre-assembled support units and motor mounts for simplified installation. Sealing systems with multiple wipers and grease retainers protect the rolling elements from contaminants like dust, chips, and moisture, making it suitable for harsh environments.

Performance advantages are substantial, starting with the ability to achieve speeds up to 5 m/s and accelerations exceeding 30 m/s², thanks to the reduced friction and heat of the caged ball system. This design also allows for smoother velocity transitions and more precise stop-and-go operations, critical in high-cycle automation. The high rigidity and load capacity—supporting moments up to 3,800 Nm and dynamic loads exceeding 60 kN—enable the actuator to handle heavy payloads without sacrificing accuracy. Maintenance intervals are extended due to lower wear rates, and the inherent smoothness reduces vibration transmission to sensitive components.

Typical applications leverage these strengths across demanding sectors. In industrial machinery, the SKR46 is ideal for high-speed CNC machining centers performing rapid tool changes, precision grinding and milling slides, and automated assembly robots requiring fast, accurate positioning. Within automotive manufacturing systems, it excels in high-duty-cycle welding and gluing robots, precision press-feeding equipment, and engine component transfer lines where reliability under continuous operation is paramount. For precision equipment, this actuator is deployed in semiconductor wafer handling and inspection stages, medical device assembly automation, and optical alignment systems where sub-millimeter accuracy, minimal vibration, and quiet operation are essential for product quality and process integrity.

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Long nut Block A - B with Cover SERIES
The THK LM Guide Actuator Caged Ball LM Guide Actuator SKR46 with Long Nut Block A represents a high-precision linear motion solution engineered for demanding applications requiring exceptional rigidity, smooth operation, and long-term accuracy. This system integrates a recirculating ball screw mechanism within a compact LM guide assembly, where the balls are uniquely contained within a cage structure. This caged ball design is fundamental to its performance, preventing ball-to-ball contact and minimizing friction, heat generation, and wear, even under high-speed operation or with insufficient lubrication. The SKR46 designation specifies a robust 46mm rail width, providing a substantial load-bearing capacity for its compact envelope. Key technical features define its superior performance. The incorporation of the Long Nut Block A significantly increases the number of load-carrying balls in contact with the screw shaft. This design enhancement directly translates to a higher dynamic load rating and greater rigidity, allowing the actuator to withstand higher moments and forces with minimal deflection. The precision-ground ball screw within the actuator ensures high positional accuracy and repeatability. Furthermore, the LM guide component features four rows of balls arranged in a Gothic arch groove configuration, offering equal load capacity in all directions—radial, reverse-radial, and lateral. This provides excellent stability and smooth, low-friction linear motion with high stiffness. The performance advantages of this system are substantial for machine designers and operators. The combination of the caged ball technology and the long nut block results in dramatically extended service life and maintenance intervals. It exhibits lower torque variation and more consistent running performance over time compared to standard nut designs. The high rigidity ensures minimal lost motion, which is critical for precision machining and positioning tasks. Its compact, integrated design simplifies machine assembly, reduces the number of components, and saves valuable space within the machine footprint. Typical applications for the THK SKR46 LM Guide Actuator are found in sectors where precision, reliability, and durability are non-negotiable. In industrial machinery, it is ideally suited for high-precision CNC machining centers, automated assembly robots, and high-speed pick-and-place systems. Within the automotive industry, this actuator is deployed in precision welding equipment, automated painting lines, and high-accuracy parts transfer systems. For precision equipment, it serves as a core component in semiconductor manufacturing apparatus, such as wafer steppers and wire bonders, as well as in precision inspection and measurement machines where micron-level accuracy is essential. Its robust construction and high-performance characteristics make it a cornerstone for advancing automation and precision in modern manufacturing.
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Short nut Block C - D with Cover SERIES
The THK LM Guide Actuator Caged Ball LM Guide Actuator SKR46 with Short Nut Block C represents a significant advancement in linear motion technology, engineered for applications demanding high precision, rigidity, and reliability. This actuator integrates a caged ball design within its LM guide mechanism, where balls are retained in a cage to prevent mutual contact, reducing friction, heat generation, and wear. The SKR46 model features a compact short nut block (Block C) that minimizes overall length while maintaining robust load capacity, making it ideal for space-constrained installations. Key technical features include a precision-ground raceway for smooth motion, high rigidity due to optimized contact angles, and preloaded ball circuits that eliminate backlash for exceptional positional accuracy. The caged ball system ensures consistent lubrication retention and lowers noise levels during operation, enhancing longevity in high-cycle environments. Performance advantages of this actuator are substantial, starting with its ability to handle high loads in all directions—radial, reverse-radial, and lateral—thanks to its four-row circular arc groove design. It offers a high permissible moment load, ensuring stability under complex force conditions, and achieves positioning accuracy within microns, critical for precision tasks. The low friction coefficient of the caged balls results in smoother motion, reduced stick-slip, and higher efficiency, which translates to lower power consumption and less heat buildup. Additionally, the short nut block design allows for quicker installation and easier maintenance, as it reduces the overall footprint without sacrificing stroke length or durability. This actuator is built for high-speed operation with minimal vibration, supported by THK's corrosion-resistant treatments and sealing options that protect against contaminants like dust and chips. Typical applications span various industries where precision and reliability are paramount. In industrial machinery, it is commonly used in CNC machining centers for tool positioning, automated assembly lines for precise part handling, and semiconductor manufacturing equipment where clean, vibration-free motion is essential. Within automotive systems, this actuator finds roles in robotic welding arms, engine component testing rigs, and automated paint systems that require repeatable, accurate movements. For precision equipment, it is employed in medical devices such as MRI scanner tables, optical alignment systems in lithography, and coordinate measuring machines (CMMs) that depend on sub-micron accuracy. Overall, the THK SKR46 Caged Ball LM Guide Actuator with Short Nut Block C delivers a blend of compact design, high performance, and durability, making it a versatile solution for advancing automation and precision across diverse sectors.
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Long nut Block A - B SERIES
The THK LM Guide Actuator Caged Ball LM Guide Actuator SKR46 with Long Nut Block A represents a high-precision linear motion solution engineered for demanding applications requiring exceptional rigidity, smooth operation, and long-term accuracy. This system integrates a recirculating ball screw mechanism within a compact LM guide assembly, where the balls are uniquely contained within a cage structure. This caged ball design is fundamental to its performance, preventing ball-to-ball contact and minimizing friction, heat generation, and wear, even under high-speed operation or with insufficient lubrication. The SKR46 designation specifies a robust 46mm rail width, providing a substantial load-bearing capacity for its compact envelope. Key technical features define its superior performance. The incorporation of the Long Nut Block A significantly increases the number of load-carrying balls in contact with the screw shaft. This design enhancement directly translates to a higher dynamic load rating and greater rigidity, allowing the actuator to withstand higher moments and forces with minimal deflection. The precision-ground ball screw within the actuator ensures high positional accuracy and repeatability. Furthermore, the LM guide component features four rows of balls arranged in a Gothic arch groove configuration, offering equal load capacity in all directions—radial, reverse-radial, and lateral. This provides excellent stability and smooth, low-friction linear motion with high stiffness. The performance advantages of this system are substantial for machine designers and operators. The combination of the caged ball technology and the long nut block results in dramatically extended service life and maintenance intervals. It exhibits lower torque variation and more consistent running performance over time compared to standard nut designs. The high rigidity ensures minimal lost motion, which is critical for precision machining and positioning tasks. Its compact, integrated design simplifies machine assembly, reduces the number of components, and saves valuable space within the machine footprint. Typical applications for the THK SKR46 LM Guide Actuator are found in sectors where precision, reliability, and durability are non-negotiable. In industrial machinery, it is ideally suited for high-precision CNC machining centers, automated assembly robots, and high-speed pick-and-place systems. Within the automotive industry, this actuator is deployed in precision welding equipment, automated painting lines, and high-accuracy parts transfer systems. For precision equipment, it serves as a core component in semiconductor manufacturing apparatus, such as wafer steppers and wire bonders, as well as in precision inspection and measurement machines where micron-level accuracy is essential. Its robust construction and high-performance characteristics make it a cornerstone for advancing automation and precision in modern manufacturing.
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