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LM Guide ( full-roller Type)

THK’s LM Guide (Full Roller Type) represents a significant evolution in linear motion technology, engineered to deliver exceptional rigidity, high load capacity, and smooth, precise movement under the most demanding industrial conditions. This system utilizes cylindrical rollers as the rolling elements within the guide mechanism, a design choice that fundamentally enhances its performance characteristics over traditional ball-based systems. The full roller configuration ensures a larger contact area between the rollers and the raceways, distributing loads more effectively and enabling the guide to withstand substantial forces from all directions—radial, reverse-radial, and lateral.

Key technical features define its superior capability. The rollers are meticulously arranged in a full-complement structure, eliminating the need for a retainer and maximizing the number of load-bearing elements within the limited space of the block. This design achieves a remarkably high load rating and stiffness, significantly reducing elastic deformation under stress. The LM Guide (Full Roller Type) incorporates precisely ground raceways and rollers, coupled with a optimized crowning profile at the roller ends. This critical engineering detail mitigates stress concentration at the edges, ensuring smooth roller circulation and maintaining consistent, low-friction motion throughout the entire stroke. Many models also integrate seals and wipers to effectively shield the critical rolling elements from contaminants like dust, chips, and moisture, thereby ensuring long-term operational reliability and reducing maintenance intervals.

The performance advantages are substantial and directly address the needs of heavy-duty and high-precision applications. The immense rigidity translates into minimal deflection during operation, which is paramount for maintaining accuracy in machining and positioning tasks. Its high load capacity allows for the design of more compact machinery, as a single Full Roller Type LM Guide can often handle loads that would otherwise require larger or multiple ball-type guides. The system exhibits excellent damping characteristics, absorbing vibrations and contributing to smoother operation, reduced noise levels, and improved surface finish in machining processes. Furthermore, the efficient roller-to-raceway contact results in a lower coefficient of friction, which can contribute to reduced power consumption for driving mechanisms.

These attributes make the THK LM Guide (Full Roller Type) an indispensable component across a wide spectrum of industries. In industrial machinery, it is the preferred solution for heavy-duty machining centers, where it provides the stable foundation for spindle heads and columns subjected to intense cutting forces. It is equally critical in high-precision grinding machines and electrical discharge machining (EDM) equipment, where its rigidity ensures micron-level accuracy. Within the automotive sector, these guides are deployed in robust robotic welding and assembly arms, transfer lines handling heavy engine blocks, and high-speed pick-and-place systems. In the realm of precision equipment, they facilitate exacting movements in semiconductor manufacturing apparatus, such as steppers and wafer handlers, and in precision measuring instruments, where any play or deflection would compromise the integrity of the measurement data.

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Ultra-high Rigidity (Low center of gravity)Model SRN-G
The THK LM Guide SRN G Series represents a significant advancement in linear motion technology, featuring a full roller type design engineered for ultra-high rigidity and a low center of gravity. This configuration utilizes cylindrical rollers arranged in a full-complement, non-recirculating structure within a Gothic arch groove raceway. This fundamental design eliminates the need for a ball retainer, maximizing the number of load-bearing elements in contact with the raceway at any given moment. The result is a dramatic increase in load capacity, rigidity, and operational stability compared to conventional ball-based linear guides. A primary technical feature of the SRN G model is its exceptional rigidity, which is crucial for applications demanding minimal deflection under heavy loads or high moment forces. The full roller contact across the Gothic arch profile distributes stress more evenly, substantially reducing elastic deformation. This inherent stiffness is further enhanced by the guide's low center of gravity design. By positioning the rolling elements and the load-bearing mass closer to the mounting base, the guide exhibits superior resistance to overturning moments, ensuring unwavering precision and repeatability during high-speed, high-acceleration movements. The rollers themselves are manufactured to micron-level tolerances, ensuring smooth, consistent rolling motion with minimal friction and exceptional travel accuracy. The performance advantages derived from this design are substantial. The ultra-high rigidity translates directly into improved machining and positioning accuracy, as it prevents chatter and deflection during cutting operations or precise stops. This makes it ideal for heavy-load applications where precision is non-negotiable. The low friction of the roller system contributes to high-speed capability and excellent motion efficiency, reducing drive power requirements and minimizing heat generation. Furthermore, the robust construction and large contact area contribute to an extended service life and high resistance to shock and vibration, even in the most demanding environments. Typical applications for the THK SRN G LM Guide are found wherever heavy loads, high rigidity, and supreme accuracy are paramount. In industrial machinery, it is the component of choice for heavy-duty machining centers, high-precision grinders, and large-scale transfer lines where it supports massive slides and gantries. Within automotive manufacturing systems, these guides are integral to welding robots, heavy-duty press feeders, and precision assembly equipment that must maintain alignment under significant force. In the realm of precision equipment, the SRN G is deployed in semiconductor manufacturing apparatus, precision inspection machines, and advanced optical positioning systems, where its stability and accuracy are critical for micron-level tolerances. Its ability to provide unwavering support and guidance makes it a foundational component for enhancing the performance and reliability of advanced automation and precision engineering systems.
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Ultra-high Rigidity Model SRG-G
The THK LM Guide SRG G Series represents a significant advancement in linear motion technology, featuring a full roller type design engineered for ultra-high rigidity and exceptional load capacity. This guide utilizes cylindrical rollers in both the rail and block, which are precision-ground to optimize contact with the raceways. This configuration ensures a robust, stable bearing arrangement capable of withstanding heavy loads and moments with minimal elastic deformation. The rollers are meticulously arranged in a staggered pattern to provide continuous, smooth contact along the entire travel path, effectively distributing stress and enhancing the system's overall durability and service life. Key technical features of the SRG G model include its optimized roller end design and specialized crowning, which mitigate edge loading and stress concentration at the roller ends. This design refinement significantly reduces friction and wear, contributing to consistent performance over extended operational periods. The guide is constructed from high-grade steel, subjected to rigorous heat treatment processes to achieve superior surface hardness and core toughness, ensuring resistance to indentation and fatigue under demanding conditions. Additionally, the SRG G incorporates an advanced sealing system comprising multiple seals and scrapers that effectively exclude contaminants such as dust, chips, and moisture, while retaining lubrication within the rolling elements. This results in maintained accuracy and prolonged maintenance intervals, even in harsh environments. Performance advantages are evident in its ability to deliver high positional accuracy and repeatability, critical for applications requiring precise linear movement. The ultra-high rigidity minimizes deflection under load, enabling higher feed rates and improved machining efficiency without sacrificing precision. Its high-speed capability is supported by reduced vibration and noise levels, contributing to smoother operation and enhanced workpiece quality. The SRG G's design also allows for easy installation and adjustment, with options for pre-load selection to match specific application requirements, from light pre-load for high-speed applications to heavy pre-load for high rigidity needs. Typical applications span various high-demand sectors, including industrial machinery such as CNC machining centers, where it provides stable support for spindle heads and tool changers under heavy cutting forces. In automotive manufacturing systems, it is employed in robotic welding arms, transfer lines, and precision assembly equipment that require robust, reliable motion under continuous operation. Within precision equipment, the SRG G finds use in semiconductor manufacturing apparatus, optical measuring instruments, and medical devices where ultra-high rigidity and minimal vibration are paramount for achieving micron-level accuracy and repeatability. Its versatility and reliability make it an ideal choice for enhancing productivity and precision in advanced automation and manufacturing processes.
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4-Way Equal Load Roller-Type LM Guide Model HRX
The THK LM Guide HRX Series represents a significant advancement in linear motion technology through its full roller type design, featuring a 4-way equal load configuration that ensures uniform stress distribution across all rolling elements. This model employs cylindrical rollers arranged in a unique pattern where loads are equally supported in all four primary directions—radial, reverse radial, and lateral—providing exceptional rigidity and stability under complex force conditions. The HRX guide incorporates a precision-ground raceway with optimized crowning on roller ends to eliminate edge stress concentration, while its compact cross-section maintains high load capacity without increasing overall dimensions. Key technical features include a patented roller retainer system that prevents skewing and ensures smooth, consistent motion even at high speeds or under varying loads. The guide's sealed design integrates multi-layer wipers and grease reservoirs, effectively excluding contaminants while maintaining lubrication for extended service intervals. With preloaded options available, the HRX delivers near-zero backlash operation, making it suitable for applications requiring precise positioning accuracy. The hardened steel construction through carburizing and special heat treatment processes provides superior wear resistance and long-term dimensional stability. Performance advantages of the HRX Series manifest in several critical areas. The 4-way equal load capability enables handling of moment loads up to 50% higher than conventional linear guides of comparable size, while maintaining smooth motion characteristics across the entire speed spectrum from creep to rapid traversal. The optimized roller geometry reduces friction resistance by approximately 30% compared to ball-based systems, resulting in lower heat generation and reduced power consumption. This efficiency translates to longer maintenance cycles and reduced total cost of ownership. The guide's vibration damping characteristics contribute to improved surface finish quality in machining applications and enhanced positioning repeatability within microns. Typical applications span multiple industries where reliability and precision are paramount. In industrial machinery, the HRX guides are deployed in high-precision machining centers for tool positioning, semiconductor manufacturing equipment requiring contamination-resistant operation, and injection molding machines demanding high moment load capacity. Automotive production lines utilize these guides in robotic welding arms, precision assembly systems, and automated inspection equipment where consistent performance under continuous operation is essential. The series also finds application in precision equipment such as coordinate measuring machines, optical positioning systems, and medical device manufacturing where smooth motion and accuracy directly impact product quality. The HRX's ability to maintain performance under harsh conditions—including exposure to cutting fluids, metal chips, and temperature variations—makes it particularly valuable in demanding manufacturing environments where equipment uptime directly correlates with productivity.
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