I. Design and Installation Principles of Linear Guide Rails
1. General Positioning Principle
The reference side of the linear guide rail needs to be positioned, while the non-reference side does not require positioning (as shown in Figure 1). There are two common guide rail positioning methods in the non-standard automation industry: Figure 1 Guide Rail Positioning Method relies solely on processing accuracy, enabling convenient, fast and accurate installation; Figure 2 Guide Rail Positioning Method features easy processing, installation and adjustment of the single-side guide rail. The driven side guide rail should take the reference side as the benchmark and be adjusted by a dial indicator-an essential detail for successful linear guide rail installation.
2. Principles for High Precision and High Rigidity Scenarios
When high precision and rigidity of linear motion are required, 2 base installation reference planes and 1 workbench installation reference plane can be set. For environments with large vibration, impact and strict precision demands, both sides of the two guide rails should be positioned and equipped with lateral pressing devices; otherwise, only one side of one guide rail needs positioning. Roller Guide Rails also perform excellently in such high-demand scenarios due to their robust structure. Various designs of pressing devices are available.
3. Adding Anti-overflow and Limit Devices
① Design positioning pin holes at both ends of one guide rail on the base plate to achieve precise positioning, which is a key step in optimizing linear guide rail installation. ② Add slider limiters to prevent the slider from sliding out accidentally-avoiding component damage during assembly and safety hazards during equipment operation.
4. Design Principle for Distance Between Two Sliders
When selecting two sliders, the distance between them should not be less than 30mm. Since the oil nozzle on the slider is usually 12mm to 16mm in size, sufficient spacing prevents mutual interference. During installation, face the oil nozzle outward for convenient assembly, subsequent maintenance and oiling-details that Lishui City Hengli Automation Technology Co.,LTD always emphasizes to customers for long-term stable use.
5. Hanging and Inverted Installation Specifications
For hanging or inverted linear guide rail installation, the specification should be 2-3 sizes larger than that for positive installation. For example, if a size 15 linear guide rail is used for positive installation, size 25 or above is recommended for inverted installation. Additionally, increasing the number of sliders provides more support points, enhancing system stability and safety. Roller Guide Rails also follow this specification for inverted installation to ensure reliable operation.
6. Secondary Processing Requirements for Weldments
For weldments requiring secondary processing after welding, the processing must be completed in one go to ensure consistent benchmarks. The two installation surfaces need to meet flatness requirements and be on the same plane. Welding causes thermal deformation, so multiple processing of slider and guide rail installation grooves/holes after welding will lead to benchmark deviations. One-time processing ensures stable benchmarks, controls dimensional and geometric tolerance deviations, and guarantees assembly accuracy-critical for the long-term performance of products supplied by Lishui City Hengli Automation Technology Co.,LTD.
7. Adding Protective Devices
In harsh service environments (e.g., dust, liquid), equip linear guide rails with corresponding protective devices to maintain good working conditions, reduce friction and wear, and extend service life-another important consideration for linear guide rail installation in industrial scenarios.
8. Tolerance Setting for Slider Installation Open Grooves
The width tolerance of slider and guide rail grooves is set between (+0.05~+0.1), and the installation surface finish should reach Ra3.2. Pay close attention to benchmarks during marking: the center of the slider/guide rail screw hole must align with the groove center. Forcing mismatched screws to lock will severely affect assembly accuracy and service quality.
II. Common Slider Installation Methods
1. Embedded Installation
This is the most reliable and widely used method. Grooved embedded positioning achieves stability by grooving the slider and installation surface, then embedding the slider into the groove. It has low requirements for installation skills, suitable for batch assembly or high-precision, high-rigidity working conditions. Note: Correct groove tolerance setting is crucial for successful installation; the chamfer at the groove bottom must be smaller than that of the slider to ensure tight fitting.
2. Locating Pin Positioning (Dual Pins for Accuracy)
Installation accuracy: ±0.03mm. This method uses 2 pins for precise positioning through the fit between pins and slider holes. However, non-standard installation may cause pin detachment-pin holes must use interference fit. After installation, verify that the slider is fully attached to the pins to ensure positioning reliability.
3. Single-Side Shoulder (Step) Positioning
Featuring a simple structure and easy assembly/disassembly, this method relies on processing precision and accounts for over 60% of applications in automated equipment. Core principle: One side of the slider is closely attached to the equipment step/stop edge to form a stable support surface. Installation accuracy: Contact surface flatness ≤0.01mm/㎡, gap after installation (detected by feeler gauge) ≤0.03mm. Strictly control the chamfer difference above 0.5mm-the slider's chamfer must be larger than that of the shoulder bottom to avoid interference.
4. Side Gasket Positioning
This method simplifies parts and offers flexibility, similar in principle to shoulder positioning. It uses side gaskets for positioning by leaning the slider against the gaskets. Advantages: Simplifies main part shapes, simple structure, easy assembly/disassembly. After installation, confirm the slider is fully attached to the gaskets for reliable positioning.
III. Assembly Technical Requirements & Torque Reference
1. Pre-Assembly Preparation
A. Rust-proof the guide rail and slider before assembly; ensure no scratches or grinding marks on the guide rail surface. B. Verify that the installation surface's roughness and flatness are above Ra3.2, and confirm screw hole matching with the guide rail. C. Before linear guide rail installation, use files and scrapers to remove paint, residual processing bumps, burrs, dirt and other surface defects from the installation surface.
2. Screw Locking Torque Reference
Adequate torque is essential when fixing screws. Insufficient torque will cause screws to loosen over time due to equipment vibration, leading to mechanical failures or reduced precision.
IV. Conclusion & Company Introduction
The above slider and linear guide rail positioning methods each have unique advantages, meeting "precision positioning" needs in different automated equipment and working conditions. In practical applications, avoid blind selection-carefully choose the most suitable method based on specific equipment requirements and characteristics, just like a smart "equipment housekeeper". Only in this way can automated equipment operate efficiently and complete positioning tasks accurately.
As a professional automation technology company, Lishui City Hengli Automation Technology Co.,LTD adheres to the operating principles of "people-oriented" and "integrity first". We are customer-centric, providing fast delivery and safe, secure packaging services. Our products cover a wide range of application scenarios and are deeply trusted by global buyers. Keeping pace with the times, we continuously improve enterprise management and productivity. If you have needs related to linear guide rails, slides or other automation components-especially for professional linear guide rail installation solutions-please feel free to contact us for high-quality products and technical support.
Email: admin@hengli-hltnc.com
Whatsapp: +86 13884328311
WeChat: 18767839274
https://www.youtube.com/@HLTNC
