Linear Guideway
Linear Guideway
The document provides a comprehensive analysis of PMI Linear Guideways, focusing on their design, characteristics, and applications. It highlights the advantages of linear guideways over traditional slide guides, emphasizing their precision, low friction, high rigidity, and suitability for high-speed operations.
- High Positioning Accuracy: The linear guideway design minimizes friction, ensuring high positioning accuracy and repeatability without stick-slip issues.
- Low Frictional Resistance: Frictional resistance is significantly lower compared to slide guides, maintaining precision over long periods with proper lubrication.
- High Rigidity: The four-way load design allows the guideway to bear loads in multiple directions, enhancing rigidity through preloading and additional carriages.
- High-Speed Operation: Low friction reduces the required driving force and power consumption, minimizing temperature rise during high-speed operations.
- Easy Installation: The guideways offer high precision even with less skilled installation processes, thanks to their interchangeability.
The document categorizes PMI Linear Guideways into various types based on load capacity and design, including Full Ball, Full Roller, Ball Chain, and Roller Chain types. Each type is suited for specific applications such as machine centers, NC lathes, grinding machines, and precision equipment.
The document outlines a detailed procedure for selecting the appropriate linear guideway, considering factors like load, installation space, and operating conditions. It includes steps for calculating applied loads, static safety factors, and nominal life, ensuring the guideway meets service life requirements.
- Basic Static Load Rating (C0): Defines the permissible static load to prevent deformation that could hinder motion.
- Static Safety Factor (fs): Accounts for unexpected forces due to impact and vibration, ensuring operational safety.
- Basic Dynamic Load Rating (C): Used to calculate the service life, indicating the load a guideway can handle under specific conditions.
- Nominal Life Calculation: Considers environmental factors and actual working loads to determine the guideway's service life.
The document emphasizes the importance of factors like raceway hardness and operating temperature, which affect load capacity and service life. It provides guidelines for adjusting load ratings based on these conditions.
PMI Linear Guideways offer significant advantages in precision, durability, and efficiency for various industrial applications. Proper selection and maintenance are crucial for maximizing their performance and service life.
The frictional resistance in a linear guideway system is influenced by load magnitude, preload, lubricant viscosity, and other factors. The friction coefficient varies by series, with ball types ranging from 0.002 to 0.003 and roller types from 0.001 to 0.002, excluding seal resistance. The relationship between working load and friction coefficient is crucial for system performance.
Load variations in a linear guideway system depend on factors like center gravity location, thrust location, and inertial forces during motion changes. Calculating the working load involves considering these factors across different application scenarios, such as horizontal, vertical, and tilted applications.
Linear guideway systems can handle radial, reverse-radial, and lateral loads. When multiple loads are applied, they are converted into equivalent loads for service life and safety calculations. The mean load, considering varying loads, is essential for determining service life.
Linear guideway accuracy involves dimensional tolerances and running accuracy, categorized into five classes: normal, high precision, precision, super precision, and ultra precision. The accuracy is measured by height and width differences among carriages.
Preload enhances rigidity and is selected based on application needs. Preload grades range from clearance to ultra-heavy, each suited for specific conditions and applications.
The MSA series features a 45° contact angle for equal load distribution in all directions, suitable for high precision and rigidity applications. The design ensures smooth movement, low noise, and self-alignment capabilities. Interchangeability allows for flexible installation and maintenance.
Carriage types include heavy and ultra-heavy load options, with various mounting configurations. Rail types are available in counter-bore and tapped hole designs, accommodating different installation needs.
The MSA series specifications cover size, carriage type, preload, rail type, and accuracy grade, providing a comprehensive guide for selecting the appropriate linear guideway system.
The document outlines the specifications for the MSA series linear guideways, focusing on various types such as ultra-heavy load, interchangeable, and non-interchangeable types. Key specifications include:
- Carriage types: Flange type (LA, LE), Square type (LS).
- Dust protection options: UU, SS, ZZ, DD, KK, LL, RR, HD.
- Preload options: Light (FC), Medium (F0), Heavy (F1) - Note: F1 is not available for MSA15.
- Accuracy grades: Normal (N), High (H), Precision (P).
- Rail types: Counter-bore (R), Tapped hole (T).
The document provides detailed procedures for selecting the appropriate MSA series model based on:
- Rail length and hole pitch specifications.
- Running parallelism values for different rail lengths and accuracy grades.
- Dimensional tolerances for mounting surfaces, including height (H) and distance (W2) tolerances.
Standards for the MSA series include:
- Maximum rail lengths and standard pitch for mounting holes.
- Tolerances for parallelism and level differences between axes.
- Specifications for bolt sizes and tapped-hole rail dimensions.
Recommendations for optimal use include:
- Ensuring proper lubrication to enhance performance and service life.
- Considering preload grades and accuracy requirements for specific applications.
- Utilizing the self-alignment capability to compensate for minor dimensional errors in mounting surfaces.
Tables provide critical data on:
- Running parallelism values for different rail lengths and accuracy grades.
- Dimensional tolerances for various MSA models.
- Basic load ratings and static moment ratings for different carriage and rail configurations.
The document provides detailed specifications and characteristics of the MSB series linear guideways, focusing on their compact design, smooth movement, self-alignment capability, and interchangeability. It also covers the MSR series, which uses rollers for higher rigidity and load capacity.
The MSB series is available in sizes 15, 20, 25, 30, and 35, with various carriage types for medium, heavy, and ultra-heavy loads. The carriages can be mounted from the top or bottom, and the series offers different preload options (light, medium, heavy) and accuracy grades (N, H, P, SP, UP). The document includes detailed dimensions and load ratings for each model.
The MSB series features a compact design with four trains of balls at a 45° contact angle, allowing equal load distribution in all directions. The simplified circulating system ensures smooth and quiet movement. The self-alignment capability compensates for installation errors, ensuring precise linear motion.
The interchangeable design allows for random matching of rails and carriages, maintaining similar preload and accuracy. This feature facilitates stocking as standard parts, simplifying installation and maintenance.
The MSR series uses rollers instead of balls, providing higher rigidity and load capacity. It is designed for high accuracy and heavy load applications, with a 45° contact angle for optimal load distribution.
The document outlines the dimensional tolerances for mounting surfaces and the permissible parallel deviation between axes. It also provides details on the shoulder height and corner radius for installation.
The document includes tables detailing running parallelism values, preload grades, and dimensional tolerances. Figures illustrate the design and dimensions of the guideways.
The document outlines specifications for stainless steel linear guideways, focusing on the MSC and MSD series. Key parameters include dust protection options (LL, RR), preload grades (FZ, FC, F0), and accuracy grades (N, H). The series are available in sizes 7, 9, 12, and 15, with rail types specified as R (Counter bore type). Rail lengths and hole pitches are detailed, with accuracy grades reiterated as N and H.
Running parallelism values are provided for various rail lengths, with specific tolerances for height and distance differences. The document specifies the preload grades for different series and sizes, with clearance and preload values detailed for MSC and MSD series. Dimensional tolerances for mounting surfaces are also included.
The document recommends specific preload grades and accuracy levels for different applications. It emphasizes the importance of selecting the appropriate dust protection options and preload grades to ensure optimal performance and longevity of the guideways.
Tables provide detailed running parallelism values for different rail lengths and accuracy grades. Tolerances for height and distance differences are specified for various model numbers and accuracy grades. The document also includes specifications for carriage and rail dimensions, basic load ratings, and static moment ratings.
The SME series is highlighted for its ball chain design, which enhances smooth movement and stability, making it suitable for high-speed and high-accuracy applications. The series offers self-alignment capabilities and low noise operation, with various carriage types available for heavy and ultra-heavy loads.
The document outlines the specifications for various linear guideway models, focusing on the SME series. It details the tolerances for height (H) and distance (W2), with specific values for height difference (ΔH) and distance difference (ΔW2) across different models and accuracy grades (Normal, High, Precision).
The document specifies preload grades (Light, Medium, Heavy) for different SME models, indicating the permissible preload range. It also provides detailed dimensions for rail and carriage components, including shoulder height, corner radius, and bolt sizes.
The SME series features self-alignment capabilities to compensate for minor mounting surface errors, ensuring smooth linear motion. Tolerances for parallelism between axes are provided, with specific values for different preload grades.
Details on rail dimensions, basic load ratings, static moment ratings, and weights are included for various SME models. The document also covers the maximum rail length and standard pitch, along with the number of rail mounting holes.
The SMR series uses rollers instead of balls, offering higher rigidity and loading capacity. The design ensures smooth movement, low noise, and effective lubrication, making it suitable for high accuracy and heavy load applications. The document describes different carriage types (SMR-E, SMR-S, SMR-LE, SMR-LS) and rail types (Counter bore, Tapped Hole).
- Carriage Types: Available in heavy load (E: Flange type, S: Square type) and ultra-heavy load (LE: Flange type, LS: Square type).
- Rail Types: R (Counter-bore type) and T (Tapped hole type).
- Preload Grades: F0 (Medium), F1 (Heavy), F2 (Ultra Heavy).
- Accuracy Grades: H, P, SP, UP, with specific tolerances for height and distance differences.
- Design: Features a 45° contact angle for equal load distribution in all directions, suitable for high precision and rigidity applications.
- Interchangeability: Allows for random matching of rails and carriages, facilitating easier installation and maintenance.
The document outlines preload options for linear guideways, including light (FC) and medium (F0) preload. Accuracy grades are specified as N, H, and P. Special carriage codes and interchangeable types are also detailed, with series sizes of 21, 27, and 35.
Rail types include counter-bore (R) with various lengths and hole pitches. Dust protection options are available. Running parallelism values are provided for different rail lengths and accuracy grades, ranging from normal (N) to ultra-precision (UP).
Tolerances for height and distance are specified for different model numbers and accuracy grades. Running parallelism between surfaces is also detailed.
Preload grades are categorized as light, medium, and heavy, with specific dynamic load ratings. Installation guidelines emphasize the importance of correct bolt tightening sequences and the use of push screws for alignment.
Installation directions depend on machine structure and load direction, with codes for horizontal, vertical, inverted, and other orientations. Fixing methods include the use of shoulder plates, push screws, taper gibs, and needle rollers to prevent displacement due to vibration or impact.
Markings on rails and carriages help identify reference sides and master rails. Combined use requires matching serial numbers and correct alignment of reference sides.
Post-installation accuracy measurement is conducted using dial gauges or autocollimeters. Recommended tightening torques for various bolt models and materials are provided to ensure proper mounting accuracy.
The document provides detailed specifications for various models of linear guideways, including the SMR and SME series. Each model is listed with dimensions for the SL Lubricator and carriage, such as height, width, thickness, and tapped hole size. The document also notes the availability of dust-proof series options (UU, SS, ZZ).
The document describes the use of a grease gun with different nozzles for supplementary grease application. Key specifications include a discharge pressure of 15MPa, a discharge rate of 0.35g per stroke, and a weight of 680g.
Details are provided on various grease nipples and oil piping joints, including their dimensions and compatible models. The document specifies different types of dust-proof options and their corresponding model numbers.
The document outlines the relationship between lubrication direction and the reference side of the guideway. It includes codes for different lubrication fittings and emphasizes the importance of contacting the manufacturer for non-standard applications.
Standard mounting locations for carriages are discussed, with options for lateral and top applications. The document specifies the use of adapters for lateral applications in certain series.
Guidelines are provided for handling linear guideways, including avoiding tilting, beating, or dropping the guideways. Lubrication instructions emphasize removing anti-rust oil and ensuring even distribution of grease. Usage precautions include maintaining temperatures below 80℃ and using dummy rails for carriage removal.
Linear guideways should be stored in a horizontal orientation, enclosed in a package, and kept away from extreme temperatures and humidity.
Catalog excerpts
Precise Stable Durability High Rigidity Meet the Multi-Demand of Accuracy and Efficiency
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Linear Guideway
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The Characteristics of PMI Linear Guideways (1) High positioning accuracy, high repeatability The PMI linear guideway is a design of rolling motion with a low friction coeffcient, and the difference between dynamic and static friction is very small. Therefore, the stick-slip will not occur when submicron feeding is making. (2) Low frictional resistance, high precision maintained for long period The frictional resistance of a linear guideway is only 1/20th to 1/40th of that in a slide guide. With a linear guideway, a well lubrication can be easily achieved by supplying grease through the grease...
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LINEAR GUIDEWAY The Characteristics of PMI Linear Guideways
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The Classification Chart of PMI Linear Guideways Type Model MSA-A MSA-LA Full Ball, Heavy Load Type MSA-E MSA-LE MSA-S MSA-LS MSB-TE MSB-E Full Ball, Compact Type MSB-TS MSB-S MSC Full Ball, Miniature Type MSD
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Major Application • Self Alignment Capability • Smooth Movement • Low Noise • Interchangeability Machine Center, NC lathe, XYZ axes of heavy cutting machine tools, Grinding head feeding axis of grinding machines, Milling machine, Z axis of boring machine and machine tools, EDM, Z axis of industrial machine, Measuring equipment, Precision XY table, Welding machine, Binding machine, Auto packing machine The Classification of PMI Linear Guideways • Heavy Load, High Rigidity LINEAR GUIDEWAY • Compact, High Load • Self Alignment Capability • Smooth Movement • Low Noise • Interchangeability • Ultra...
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Model MSR-E Full Roller, Heavy Load Type MSR-LE MSR-S MSR-LS SME-E Ball Chain, Heavy Load Type SME-LE SME-S SME-LS SMR-E Roller Chain, Heavy Load Type SMR-LE SMR-S SMR-LS MSG-E Full Ball Wide Rail type MSG-S
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• Ultra Heavy Load • Smooth Movement • Low Noise • Good lubricant Effect • Heavy Load, High Rigidity • Self Alignment Capability • Ball Chain Design • Smooth Movement • Low Noise, Good Lubricant Effect • Interchangeability Major Application Machine Center, NC lathe, Grinding machine, Five axes milling machine, Jig borer, Drilling machine, Horizontal milling machine, Mold processing machine, EDM Machine Center, NC lathe, XYZ axes of heavy cutting machine tools, Grinding head feeding axis of grinding machines, milling machine, Z axis of boring machine and machine tools, EDM, Z axis of industrial...
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The Procedure of Select Linear Guideway Identify the operating conditions span, No. of carriages, No. of rails change Parameters for calculating load on the linear guideway • Space available for installation • Size (span, No. of carriages, No. of rails) • Installation position (horizontal, vertical, tilted, or wallhung, etc.) • Magnitude, direction, and location of imposed load • Frequency of use (duty cycle) • Stroke length • Moving speed , acceleration • Required service life, and accuracy • Operating environment Select type Type or size changed Select proper type and size (If applied with...
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Load Rating and Service Life of Linear Guideway system, the load capacity and service life of the model must be taken into consideration. To verify the static load capacity, the basic static load rating (C0) is taken to obtain the static safety factor. The service life can be obtained by calculating the nominal life based on basic dynamic of a linear guideway is defined as the total running distance that the linear guideway travel until flaking occurs. 4.1 Basic Static Load Rating(C0) A localized permanent deformation will develop between raceways and rolling elements when a linear guideway receives...
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4.2 Static Permissible Moment(Mo) When a moment is applied to a linear guideway, the rolling balls on both ends will receive the most stress among the stress distribution over the rolling elements in the system. The static permissible moment (Mo) refers to a static moment in a given direction with specific magnitude applied at the contact area under the most stress where the sum of permanent deformation develops between the raceway and rolling elements is 0.0001 times the diameter of rolling elements. Therefore, the static permissible moment sets a limit on the static moment. In linear guideway...
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Regular industrial Normal loading condition With impact and vibration Normal loading condition With impact and vibration Machine tool Standard value of static safety factor 4.4 Basic Dynamic Load Rating (C ) Even when identical linear guideways in a group are manufactured in the same way or applied under the same condition, the service life may be varied. Thus, the service life is used as an indicator for determining the service life of a linear guideway system. The nominal life (L) is defined as the total running distance that 90% of identical linear guideways in a group, when they are applied...
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I n order to ensure the optimum load capacity of linear guideway system, the hardness of raceway must be HRC58~64. If the hardness is lower than this range, the permissible load and nominal life will be decreased. For this reason, the basic dynamic load rating and the basic static load rating should be multiplied by hardness factor for rating calculation. See figure below. The hardness requirement of PMI linear guideway is above HRC58, thus the fH=1.0. Temperature factor fT When operating temperature higher than 100℃, the nominal life will be degraded. Therefore, the basic dynamic and static...
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Although the working load of liner guideway system can be obtained by calculation, the actual load is mostly higher than calculated value. This is because the vibration and impact, caused by mechanical reciprocal motion, are difficult to be estimated. This is especially true when the consideration of speed and vibration, the basic dynamic load rating should be divided by the empirical load factor. See the table below. Motion Condition Operating Speed Slight impact & vibration Moderate impact & vibration Strong impact & vibration Load Rating and Service Life of Linear Guideway vibration from high...
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