The THK SHS-LV linear guide is a high-performance component designed for precision linear motion systems, combining low-profile design with exceptional rigidity and load capacity. As part of THK’s SHS series, the SHS-LV variant is engineered to meet the demanding requirements of modern industrial applications, from semiconductor manufacturing to heavy-duty machining. Its innovative design and reliability make it a preferred choice for engineers seeking to optimize accuracy and efficiency in mechanical systems.
Design and Structure
The SHS-LV linear guide features a compact profile with a reduced height and width, making it ideal for applications where space constraints are critical. Unlike standard models, the SHS-LV incorporates a narrow, elongated slider (carriage) that extends the length of the LM slider, significantly enhancing its load-bearing capacity without compromising its footprint. This design is complemented by four rows of steel balls arranged at a 45° contact angle within precision-ground raceways. This configuration ensures equal load distribution in all four directions (radial, reverse radial, and lateral), allowing the guide to operate reliably in any orientation.
A key innovation in the SHS-LV is its DF (Double-Flower) combination of arc grooves, which provides self-aligning capabilities. This feature absorbs installation errors, such as misalignment or uneven mounting surfaces, while maintaining smooth, high-precision motion even under preload conditions. Additionally, the guide incorporates advanced sealing systems (e.g., end seals, side seals, and internal seals) to protect against contaminants like dust and moisture, thereby extending service life in harsh environments.
Performance Characteristics
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High Load Capacity and Rigidity: The SHS-LV is designed to handle high dynamic and static loads (e.g., dynamic load capacity up to 28.1 kN and static load capacity up to 50.3 kN for the SHS20LV1SS model). Its optimized ball circulation system and rigid structure minimize deformation under heavy loads, ensuring stability in applications such as CNC machining centers and industrial robots.
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Precision and Smoothness: Manufactured using precision grinding techniques, the raceways achieve exceptional straightness and surface finish. This results in nanometer-level positioning accuracy and smooth, low-friction motion, critical for semiconductor fabrication equipment and medical imaging devices like MRI machines.
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Durability and Corrosion Resistance: Some SHS-LV models feature special surface treatments or materials (e.g., corrosion-resistant coatings), making them suitable for challenging environments such as food processing or chemical industries.
Applications
The SHS-LV series is widely used in:
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Industrial Automation: Provides precise linear motion for robotic arms and conveyor systems.
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Precision Machinery: Ensures accuracy in grinding machines and EDM equipment.
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Semiconductor Manufacturing: Facilitates high-speed, precise movement in wafer handling and lithography systems.
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Medical Equipment: Enables smooth, quiet operation in diagnostic imaging devices and surgical robots.
Installation and Maintenance
Proper installation is crucial for optimal performance. Key steps include:
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Cleaning and Inspection: Ensure guides and sliders are free of debris.
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Preload Adjustment: Apply appropriate preload (e.g., light preload C1 for high precision; medium preload C0 for high rigidity) to balance stiffness and smoothness.
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Lubrication: Use THK-recommended lubricants to reduce wear.
Maintenance cycles depend on operating conditions: For example, in clean environments, lubrication may be required every 3–6 months, while in dusty or humid settings, weekly checks are advisable.
Conclusion
The THK SHS-LV linear guide stands out for its compact design, high precision, and robust performance. By integrating world-standard dimensions with advanced features like self-alignment and corrosion resistance, it addresses the evolving needs of precision engineering across diverse industries. Whether enhancing automation or enabling breakthrough medical technologies, the SHS-LV remains a cornerstone of reliable linear motion solutions.
