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Super Precision Bearings

Product catalog summary

Introduction
The document is a technical catalogue from Schaeffler Technologies GmbH & Co. KG, focusing on super precision bearings, specifically spindle bearings, super precision cylindrical roller bearings, and axial angular contact ball bearings. It highlights the company's commitment to precision, operational security, and customer-centric solutions.

Foreword
The foreword emphasizes Schaeffler's leadership in high precision bearing solutions for machine tools, highlighting their brands INA and FAG. The company focuses on enhancing customer benefits through innovative solutions, technical support, and a comprehensive product portfolio.

Technical and Economic Leadership
Schaeffler's approach combines technical solutions with economic efficiency. The company offers advanced calculation and simulation tools, training, and advisory services to ensure optimal bearing performance and cost-effectiveness.

Product Range and Specifications
The catalogue details various types of bearings, including standard and hybrid spindle bearings, cylindrical roller bearings, and axial angular contact ball bearings. It provides technical specifications, design variants, and performance features for each type.

Materials and Hybrid Bearings
FAG super precision bearings are made from high-quality materials, including Cronidur 30 for enhanced life and performance. Hybrid bearings, combining steel rings and ceramic balls, offer advantages such as reduced centrifugal forces and improved thermal expansion properties.

Lubrication and Maintenance
The document discusses the importance of lubrication in bearing systems, advocating for grease lubrication at high speeds. It outlines the rigorous approval process for lubricants to ensure reliability and performance.

Catalogue Structure
The catalogue is structured into five parts, covering technical principles, product specifications, customer solutions, and an appendix. It serves as both a product overview and a technical guide for bearing selection and design.

Conclusion
The catalogue represents the state of technology as of September 2010, replacing previous editions. It reflects advancements in rolling bearing technology and practical application experiences.

Technical Principles

Spindle Bearings: These include universal bearings with options for single or double rows, large or small balls, and materials such as steel or ceramic. They can be open or sealed and are designed for high precision and speed.
Super Precision Cylindrical Roller Bearings: Available in single or double rows with steel or ceramic rollers, these bearings are open and designed for high precision applications.
Axial Angular Contact Ball Bearings: These are double direction and open, suitable for specific axial load applications.

Customer Solutions

Spindle Bearings: Options include spring preloaded and non-locating bearing units with features like thin dense chromium coating and pre-greased open bearings.
Cylindrical Roller Bearings: These come with cylindrical bores and special radial internal clearance for specific applications.

Load Carrying Capacity and Operating Life

Operating Life: Super precision bearings are selected based on accuracy, rigidity, and running behavior. They require a hydrodynamic lubricant film for optimal performance.
Fatigue Strength: The load ratio S0* is used to check fatigue strength, ensuring the essential precondition for fatigue strength is met.
Cleanliness: Cleanliness is crucial for extending the operating life of bearings, with specific oil purity classes recommended for different contact types.

Lubrication

Principles: Proper lubrication is essential for reliable function and long operating life. It involves ensuring lubricant presence at all contact points and selecting the appropriate lubrication method.
Selection of Lubrication Type: The choice between grease and oil lubrication depends on the maximum operating speed required, with specific criteria for each type.

Tolerances

Super Precision Bearings: Tolerances are critical for ensuring the performance of bearings, with specific guidelines for chamfer dimensions and machining tolerances of adjacent parts.

Design and Examples of Bearing Arrangements

Design and Applications: Includes considerations for preload, rigidity, bearing contact angle, and selection based on ball size and material.
Examples: Various examples of bearing arrangements are provided to illustrate different design approaches.

Bearing Monitoring

Monitoring Types: Includes periodic, continuous, and one-off monitoring, with a focus on temperature monitoring.

Fitting

Handling and Mounting: Guidelines for handling, provision, and allocation of parts, as well as mounting procedures and recommendations for shaft nuts.

Lubrication Overview
The document discusses lubrication methods for bearings, emphasizing "for life" lubrication, minimal design work, and low system costs. It highlights the use of minimal quantity oil lubrication for high-speed spindles where grease lubrication is insufficient. The document also covers the importance of lubricant viscosity, recommending a viscosity ratio of at least 2 for optimal performance.

Grease Lubrication
Advances in grease and bearing technology have improved performance, allowing speed parameters up to 2,000,000 min–1 · mm. Greases like L075, L252, L298, and L055 are discussed, each with specific applications and temperature tolerances. The document provides detailed tables on grease quantities for various bearing types and sizes.

Grease Operating Life
The grease operating life depends on factors such as grease quantity, type, bearing type, speed, temperature, and environmental conditions. The document provides a formula for calculating total grease operating life and emphasizes the importance of the grease distribution cycle to prevent high temperatures and ensure even distribution.

Oil Lubrication
For super precision bearings, fully synthetic oils with high pressure capacity are recommended. Minimal quantity oil lubrication is preferred for high-speed applications, with pneumatic oil lubrication being the standard method. The document provides guidelines for oil quantities and nozzle design for effective lubrication.

Recommendations for Pneumatic Oil Lubrication
The document suggests using individual nozzles for each bearing, with specific design and installation guidelines to ensure effective lubrication. It also provides recommendations for oil purity, air cleanliness, and pressure requirements.

Conclusion
The document provides comprehensive guidelines on lubrication methods for bearings, emphasizing the importance of selecting the right type of lubrication and maintaining proper operating conditions to ensure optimal performance and longevity of the bearings.

Specifications and Standards
Super precision bearings are standardized according to DIN 620 and DIN ISO 1132 for dimensions and accuracies. The bearings are manufactured within narrow tolerance ranges to ensure high performance and machining accuracy. The accuracy standards are P2 for spindle bearings and SP for cylindrical roller and axial angular contact ball bearings, with an optional higher accuracy class UP available by agreement.

Dimensional and Geometrical Tolerances
The document details the measurement principles and tolerances for bore and outside diameters, including deviations and variations in single and mean diameters. It also covers width and height tolerances for inner and outer rings, and running accuracy measurements for assembled bearings.

Chamfer Dimensions
Chamfer dimensions for radial and axial bearings are specified, with tables providing measurements for various bore sizes. These dimensions are critical for ensuring proper fit and function of the bearings.

Machining Tolerances of Adjacent Parts
The performance of super precision bearings is dependent on the precision of adjacent parts. Tables compile effective dimensional and geometrical tolerances for spindle, cylindrical roller, and axial angular contact ball bearings. Mean roughness values must not exceed specified limits to maintain recommended fits.

Geometrical Tolerances
Geometrical tolerances for shafts, housings, and spacer sleeves are outlined, including cylindricity, roundness, flatness, axial runout, and coaxiality tolerances according to DIN ISO 1101. Mean roughness is also specified.

Design and Examples of Bearing Arrangements
Various spindle bearing arrangements are discussed, influenced by specific applications and operating conditions. Key considerations include preload, rigidity, contact angle, ball size and material, and sealing. The document provides guidelines for selecting bearings and bearing arrangements, emphasizing the importance of clearance-free operation and preload for high accuracy requirements.

Preload and Rigidity
Preload and rigidity are critical factors in bearing arrangements. The document discusses the impact of preload on sensitivity to temperature changes and the benefits of ceramic rolling elements in reducing operating temperatures. Rigidity is influenced by shaft diameter, number of bearings, bearing size, preload, and contact angle.

Bearing Contact Angle
Different contact angles offer various advantages and applications. Bearings with a 15° contact angle have lower axial rigidity compared to those with a 25° angle, but higher radial rigidity. The document provides guidance on selecting bearings based on contact angle, ball size, and material.

Specifications and Performance Data of Spindle Bearings

Contact Angles: 15°, 20°, 25°
Advantages: Radial rigidity, load carrying capacity, speed suitability, axial rigidity, and combined load capacity.
Applications: Grinding machines, precision machining, milling, lathes, drilling machines, and motor spindles.

Comparison of Bearing Designs

Ball Size and Material: Large and small steel or ceramic balls.
Performance: Varies in load carrying capacity, speed suitability, and service life.

Design and Examples of Bearing Arrangements

Optimum Bearing Spacing: Thermally neutral spacing recommended to compensate for thermal expansion.
Sealing: Effective sealing is crucial, especially at the spindle nose, using labyrinth seals.

Stages in Bearing Arrangement Design

Define operating conditions.
Select bearing arrangement based on application.
Define lubrication.
Select bearing type and size.
Check grease operating life.
Calculate load distribution.
Check fatigue strength.

Bearing Design Using Calculation Programs

Calculate bearing kinematics and pressures.
Assess rating life considering lubrication and cleanliness.
Calculate bending line, deflections, and rigidity.
Optimize bearing arrangement.

BEARINX® Calculation Program

Facilitates detailed analysis of rolling bearing arrangements.
Considers factors like centrifugal force, elasticity, and lubrication conditions.

Spindle Calculation Using BEARINX®

Provides recommendations for mounting fits and calculates design parameters.
Includes kinematic bearing frequencies for vibration analyses.

Comparison of Bearing Arrangements

Guide values based on spindle specifications.
Comparison of applications and performance data for various bearing arrangements.

Bearing Monitoring

Factors include forces, vibrations, temperatures, and drive power.
Types of monitoring: periodic, continuous, and one-off monitoring.

Temperature Monitoring

Temperature is a significant indicator of bearing behavior.
Stable temperature behavior is expected, with fluctuations indicating potential issues.

Fitting and Handling

Bearings must be handled with care to maintain performance.
Guidelines include cleanliness, correct part allocation, and proper mounting techniques.

Mounting Record: It is recommended to record measurement values such as seat diameter, interference, differences in intermediate ring dimensions, equilibrium temperatures, and radial and axial runout. A checklist is suggested for this purpose, with templates available online.

Matching Operations: Special matching operations may be necessary for optimal spindle performance, particularly for high-speed spindles to compensate for fit and ring expansion.

Greasing: FAG super precision bearings do not require washing before greasing. Suitable greases and quantities are specified, and greasing should be done under clean conditions. Pre-greased and sealed bearings are recommended.

Test Run and Grease Distribution: A grease distribution cycle is necessary before the test run. Detailed information is available online.

Fitting: Axial clamping of inner rings should follow specified torque values. Spindle bearings have recommended clamping forces and nut tightening torques detailed in tables.

Axial Angular Contact Ball Bearings: Recommended clamping forces and tightening torques are provided for specific bore sizes.

Recommendations for Shaft Nuts: Shaft nuts with axial bores are preferred for minimizing air turbulence. The contact faces should be ground together with the thread.

Clearance Adjustment of Cylindrical Roller Bearings: Bearings can be mounted with clearance, clearance-free, or with preload. A detailed mounting procedure is provided.

Industrial Mounting Service: Schaeffler Group offers services including mounting, inspection, defect analysis, and special tool design, which can increase bearing life and reduce costs.

Devices for Mounting Super Precision Bearings: Various gauges and heating devices are available for precise mounting, with some available for rental.

Specifications:
The document details various measurement and heating devices used in industrial settings. The MGK 132 and MGK 133 taper gauges are designed for precise measurement of taper diameters, with reproducibility within 1 μm. The MGK 132 is used for diameters between 30-150 mm, while the MGK 133 is suitable for 27-205 mm. Both gauges use reference tapers for setting.

Induction Heating Devices:
Induction heating devices, such as HEATER10 to HEATER150, are used for heating workpieces up to 150 kg. These devices are preferred for their rapid and clean heating capabilities, especially in batch mounting. The document provides detailed specifications for each model, including power consumption, voltage, frequency, and dimensions.

Equipment Rental and Training:
The Schaeffler Group offers rental services for special mounting and measuring equipment, which can be cost-effective for infrequent use. They also provide training courses on the maintenance of machine tool main spindles, covering both theoretical and practical aspects, including the use of FAG super precision bearings and induction heating devices.

Spindle Bearings:
The document provides an overview of spindle bearings, highlighting their features such as high precision, narrow tolerances, and suitability for high guidance accuracy applications. It discusses various types of spindle bearings, including universal bearings, hybrid bearings, and X-life ultra bearings, along with their load carrying capacities and contact angles.

Design and Safety Guidelines:
Guidelines are provided for designing bearing arrangements, including considerations for load carrying capacity, operating life, and static load safety factors. The document also includes dimension tables for different types of spindle bearings.

Conclusion:
The document serves as a comprehensive guide for selecting and using measurement and heating devices, as well as spindle bearings in industrial applications. It emphasizes precision, efficiency, and cost-effectiveness in equipment usage and maintenance.

Spindle Bearings Overview

Design and Materials:
The document discusses various spindle bearing designs, including those with steel and ceramic balls, and options for open, sealed, and Direct Lube (DLR) designs. Bearings can also feature Cronidur rings for enhanced performance. Hybrid bearings combine steel rings with ceramic rolling elements, offering advantages like higher speed capabilities, reduced friction, and longer grease life.

Hybrid Bearings:
Hybrid spindle bearings, using ceramic materials like silicon nitride (Si3N4), are noted for their robustness and reliability across a range of speeds. They offer improved wear resistance and reduced lubricant strain compared to all-steel bearings.

X-life Ultra Bearings:
These bearings are designed for high speeds and loads, featuring ceramic balls and Cronidur 30 rings. They offer superior heat management and higher permissible contact pressures, contributing to longer operational life and reduced system costs.

Sealed Bearings:
Sealed spindle bearings protect against environmental contaminants with non-contact gap seals. They are pre-greased with high-performance lubricants, supporting a shift from oil to grease lubrication for maintenance-free operation.

Direct Lube Bearings:
Designed for high-speed applications requiring pneumatic oil lubrication, these bearings feature annular grooves and radial feed holes for efficient lubricant delivery.

Operating Conditions:
Spindle bearings are suitable for temperatures from -30°C to +100°C, with specific grease suitable up to +80°C. They feature solid window cages made from laminated fabric.

Bearing Designations:
The document provides a detailed breakdown of bearing designations, indicating type, preload, arrangement, accuracy, and other specifications.

Load and Rigidity Considerations:
Spindle bearings are designed for load capacity, rigidity, and accuracy. The document outlines static load calculations and safety factors, emphasizing the importance of proper load distribution across multiple bearings.

Speed and Rigidity:
Achievable speeds depend on factors like bearing number, arrangement, preload, and lubrication. Speed limits are adjusted based on preload and bearing configuration, with reduction factors provided for different setups. Rigidity is influenced by bearing arrangement and preload, with axial and radial rigidity calculations detailed.

Overview: This document provides technical specifications and guidelines for spindle bearings, focusing on radial and axial rigidity, machining tolerances, interference calculations, and tolerances for precision bearings. It includes detailed tables and diagrams to support the design and application of these bearings.

Radial and Axial Rigidity: The document outlines the calculation of radial rigidity for bearing arrangements under radial forces. It provides a table with values for radial and axial rigidity, lift-off force, and bearing arrangement specifications.

Machining Tolerances: Recommendations for machining tolerances of shafts and housings are provided, with detailed tables specifying deviations, cylindricity, flatness, axial runout, coaxiality, and mean roughness for various nominal diameters.

Interference Calculation: The document discusses the importance of interference fits to prevent issues such as fretting corrosion and poor shaft guidance. It provides a method for calculating necessary interference using diagrams and the BEARINX® software, with specific examples and factors for different bearing types.

Spacer Sleeves Tolerances: Recommendations for machining tolerances of inner and outer spacer sleeves are given, including deviations, cylindricity, axial runout, parallelism, radial runout, and mean roughness.

Accuracy and Tolerances: The document specifies the tolerances for super precision spindle bearings according to DIN 620 and DIN ISO 1132 standards. It includes tables for inner and outer ring tolerances, radial runout, and axial runout for different tolerance classes (P4S, P4, P5).

Load Ratings and Speed Limits: Basic load ratings, limiting speeds, preload forces, lift-off forces, and axial rigidity values are provided for various bearing types, with specific data on dynamic and static load capacities and speed limits for grease and oil lubrication.

Conclusion: The document serves as a comprehensive guide for the design and application of spindle bearings, emphasizing the importance of precise machining and fitting to ensure optimal performance and longevity.

Overview: The document provides a detailed technical overview of super precision cylindrical roller bearings, focusing on their specifications, features, and applications. It includes information on single and double row bearings, their design, lubrication, and operating conditions.

Product Specifications: The bearings are available in single and double row configurations, with options for tapered or cylindrical bores. They are designed for high precision and load capacity, suitable for applications like machine tools and printing machinery. The document details various series such as N10, N19, NN30, and NNU49, highlighting their specific features like hybrid designs and thermally robust constructions.

Design Features: The bearings feature solid outer and inner rings, with cages made from brass or PEEK. The outer ring is removable, allowing for separate mounting. Hybrid bearings use ceramic rollers to reduce friction and wear, enhancing speed and lifespan. The document also discusses the thermally robust design that compensates for temperature fluctuations.

Lubrication and Sealing: Bearings are supplied in an open design, suitable for grease lubrication. Pneumatic oil lubrication is also possible, with specific designs like Direct Lube available for single row bearings. Double row bearings include lubrication grooves and holes in the outer ring.

Operating Conditions: The bearings can operate at temperatures from -30°C to +150°C. They are designed to handle high radial loads with minimal axial forces, supported by axial bearings. The document provides guidelines for clearance adjustment and achievable speeds under different lubrication conditions.

Design and Safety Guidelines: The document outlines the load carrying capacity, static load safety factor, and radial rigidity. It emphasizes the importance of maintaining a static load safety factor of at least 3 to ensure high accuracy. The design of bearing arrangements is discussed to optimize performance capabilities.

Marking and Designations: The document explains the marking of bearings and the structure of bearing designations, including types, dimension series, bore codes, and modifications. It provides examples of designations for both single and double row bearings.

Overview: This document provides detailed specifications and recommendations for machining tolerances of super precision cylindrical roller bearings, focusing on cylindrical and tapered shafts, housing, and radial internal clearance. It includes tables with specific tolerance values for different nominal diameters and tolerance classes (SP and UP).

1. Machining Tolerances of Cylindrical Shaft:

Recommendations for machining tolerances are provided for bearings of tolerance class SP and UP.
Tables specify deviations, cylindricity, flatness, axial runout, coaxiality, and mean roughness for various nominal shaft diameters.

2. Machining Tolerances of Tapered Shaft:

Similar recommendations and tables are provided for tapered shafts, detailing deviations of small taper diameter, roundness, flatness, axial runout, and mean roughness.
Includes a calculation example for determining shaft tolerance.

3. Machining Tolerances of Housing:

Tables outline the tolerances for housing bore diameters, including deviations, cylindricity, flatness, axial runout, coaxiality, and mean roughness.

4. Tolerances for Bearings:

Details on tolerances for single and double row bearings, including inner and outer ring tolerances for both SP and UP classes.
Includes deviation of bore and outside diameters, width variation, radial and axial runout, and inclination variation.

5. Radial Internal Clearance:

Tables provide values for radial internal clearance for bearings with tapered bores, categorized by internal clearance groups conforming to DIN 620-4.

Conclusion: The document serves as a comprehensive guide for ensuring precision in the design and manufacturing of cylindrical roller bearings, emphasizing the importance of adhering to specified tolerances to maintain performance and reliability.

Radial Internal Clearance of Bearings with Cylindrical Bore
This section outlines the radial internal clearance specifications for bearings with cylindrical bores. Bearings with accuracy SP and UP have a radial internal clearance C1, and their rings are not interchangeable. The internal clearance groups C2, CN, and C3 can be ordered with suffixes for accuracy SP and UP, and their rings are interchangeable. A detailed table provides the minimum and maximum clearance values for various nominal bore diameters.

Super Precision Cylindrical Roller Bearings
This section describes single-row super precision cylindrical roller bearings, available with steel or ceramic rollers. The bearings are identified by designations such as N10, N19 for steel rollers, and HCN10 for ceramic rollers. The document provides a dimension table listing mass, dimensions, and other specifications for standard and hybrid bearings with half the number of rollers. Suffixes like C, K, M1, PVPA1, SP, and H193 indicate modified internal construction, tapered bore, brass cage, solid cage made from PEEK, special precision, and half the number of rollers, respectively.

Direct Lube Design and Axial Displacement
The document also covers the Direct Lube design, which includes axial displacement and mounting dimensions. It provides basic load ratings, limiting speeds, and radial spring rigidity for various bearing models. The section includes detailed tables with specifications for axial displacement, mounting dimensions, and performance metrics such as dynamic and static load ratings, limiting speeds for grease and oil lubrication, and radial spring rigidity.

Overview: This document provides detailed specifications and dimensions for super precision cylindrical roller bearings, both single and double row, from the Schaeffler Group Industrial. It includes information on axial displacement, mounting dimensions, basic load ratings, limiting speeds, and radial spring rigidity.

Specifications: The bearings are available with either a cylindrical or tapered bore (taper 1:12). They feature a brass cage guided by rollers and are designed for special precision (SP). The document lists various models with their respective mass, dimensions, and axial displacement capabilities.

Dimension Tables: The tables provide detailed measurements in millimeters for each bearing model, including mass, inner diameter (d), outer diameter (D), width (B), and other critical dimensions such as r1, E, and s. Axial displacement from the central position is also noted.

Mounting Dimensions and Load Ratings: The document includes mounting dimensions with tolerances (da, Da, Etk, ra1) and basic load ratings (dynamic Cr and static C0r). Limiting speeds for grease and oil lubrication are specified, along with radial spring rigidity values.

Suffix Descriptions: The suffixes indicate specific features: 'K' for tapered bore, 'M1' for brass cage, 'SP' for special precision, 'AS' for lubrication groove and holes in the outer ring, and 'S' for similar lubrication features.

Key Data Extraction: The tables highlight the importance of minimal oil quantity lubrication and the ability of the outer ring to displace axially from its central position. The document emphasizes the precision and specific applications of these bearings in industrial settings.

Product Overview: The document provides a detailed overview of double direction axial angular contact ball bearings, specifically series 2344 and 2347, used in precision spindles of machine tools. These bearings are highly rigid, axially preloaded, and have restricted tolerances to class SP.

Features and Design: The bearings consist of solid shaft locating washers, a spacer ring, a housing locating washer, and ball and cage assemblies with solid cages. They support high axial forces due to a 60° contact angle and are combined with double row cylindrical roller bearings to support radial forces.

Sealing and Lubrication: These bearings are open design and can be lubricated with oil or grease. They require larger quantities of oil due to their substantial displacement effect, and the design must prevent oil from entering adjacent cylindrical roller bearings.

Operating Temperature: Suitable for temperatures ranging from -30°C to +150°C.

Cages: Each row of rolling elements has a ball-guided solid brass cage, indicated by the suffix M.

Design and Safety Guidelines: The document outlines the load carrying capacity, operating life, and static load safety factor. It emphasizes the importance of a static load safety factor S0 ≥ 2.5 for high accuracy.

Speeds and Preload: Suitable for moderate speeds, with higher speeds requiring single row angular contact ball bearings. Preload is determined by the spacer ring between shaft locating washers.

Machining Tolerances: Recommendations for shaft and housing machining tolerances are provided for bearings of tolerance class SP or UP.

Accuracy and Tolerances: Defined in DIN ISO 1132, with specific machining tolerances for shaft and housing locating washers.

Dimension Tables: Detailed dimensions, mass, and mounting specifications for various bearing designations are provided, including basic load ratings and limiting speeds.

Catalog excerpts

Super Precision Bearings Spindle bearings Super precision cylindrical roller bearings Axial angular contact ball bearings SCHAEFFLER GROUP

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sp1__en_gb__en.book Seite 1 Montag, 21. Februar 2011 9:04 09 d r ␣ D B ns r ds Super precision bearings d Spindle bearings Super precision cylindrical roller bearings Axial angular contact ball bearings E D

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All data have been prepared with a great deal of care and checked for their accuracy. However, no liability can be assumed for any incorrect or incomplete data. We reserve the right to make technical changes. © Schaeffler Technologies GmbH & Co. KG Revised reprint, September 2010 Reproduction in whole or in part without

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"added competence" operational security Higher speed, better accuracy, longer life, more cost-effectiveness Optimised customer benefit With its forward-looking high precision bearing solutions for feed spindles, main spindles, rotary tables and linear guidance units in machine tools, Schaeffer Group Industrial with its brands INA and FAG has been at the forefront of the world market for decades. FAG super precision bearings for main spindles stand for very high precision and absolute operational security. Innovative FAG spindle bearing solutions are continually raising standards in relation to...

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sp1__en_gb__en.book Seite 4 Montag, 21. Februar 2011 9:04 09 Figure 2 ... in the mounting of bearings 00016D38 Figure 1 The very highest precision and purity in production ... 00016D37 Foreword

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00016D39 sp1__en_gb__en.book Seite 5 Montag, 21. Februar 2011 9:04 09 Figure 4 ... in the results of production 00016D3A Figure 3 ... in the mounting of spindles

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economic leadership The starting point and objective of all activities in the company is proximity to and benefit for the customer. Precise knowledge of specific application requirements and processes is the decisive factor in selection of the technically optimum product that also incurs the lowest system costs. This may be sourced from the fully developed standard range of spindle bearings, which is unsur- passed in its scope worldwide. Equally, it may lie in an individual, application-specific solution that is provided rapidly and reliably FAG super precision bearings set standards in machine...

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The right material FAG super precision bearings are made from high quality materials. Through specific heat treatment, a long material fatigue life and wear resistance is achieved with the result that the bearings can be run permanently in many cases. There is a particular role for the material Cronidur 30, which turns a spindle bearing into an X-life ultra bearing. With its unique characteristics of reverse bendingstrength and corrosion resistance, it achieves significantly extended life, higher permissible contact pressures for fatigue strength, higher permissible speeds and significantly longer...

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About this catalogue Catalogue SP l gives an overview of the FAG product range of super precision bearing arrangements as well as the most important rules covering bearing selection, bearing arrangement design and One function of the catalogue is to present the product range of FAG super precision bearings for main spindles. In addition, it is also intended as a technical compendium forthe selection and design of bearing arrangements using super precision bearings. This catalogue brings together the most important technical principles for the designer. It thus gives a transparent representation...

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Checklists and order forms

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Product index Axial angular contact ball bearings, Axial angular contact ball bearings, Standard spindle bearings, Standard spindle bearings, Standard spindle bearings, Hybrid spindle bearings with small balls, Hybrid spindle bearings with small balls, Hybrid standard spindle bearings, Hybrid standard spindle bearings, Hybrid standard spindle bearings, High speed cylindrical roller bearings, single row, ceramic rollers, ribs on inner ring, Hybrid high speed spindle bearings, Hybrid high speed spindle bearings, Spindle bearings with small balls, Spindle bearings with small balls, Schaeffler Group...

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NIO Cylindrical roller bearings, single row, ribs on inner ring, ribless outer ring, N19 Cylindrical roller bearings, single row, ribs on inner ring, ribless outer ring, NN30 Cylindrical roller bearings, double row, ribs on inner ring, ribless outer ring, NNU49 Cylindrical roller bearings, double row, ribs on outer ring, ribless inner ring, RS70 High speed spindle bearings, RS719 High speed spindle bearings, Hybrid spindle bearings with small balls, XC719 Hybrid spindle bearings with small balls, Hybrid standard spindle bearings, XCB719 Hybrid standard spindle bearings, Schaeffler Group Industrial...

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Technical principles Spindle bearings Universal bearings With large or small balls Steel or ceramic balls Steel or Cronidur rings Open orsealed Direct Lube Super precision cylindrical roller bearings Steel or ceramic rollers Axial angular contact ball bearings Double direction Customer solutions Spindle bearings Spring preloaded non-locating bearing unit Thin dense chromium coating Open bearings supplied greased Cylindrical roller bearings Bearings with cylindrical bore and special radial internal clearance Checklists and order forms

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sp1__en_gb__en.book Seite 14 Montag, 21. Februar 2011 9:04 09 Technical principles Load carrying capacity and operating life Rigidity Lubrication Tolerances Design and examples of bearing arrangements Bearing monitoring Fitting

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Technical principles Schaeffler Group Industrial SP1 | 15

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Technical principles Schaeffler Group Industrial

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Load carrying capacity and operating life Super precision bearings must guide machine parts with high precision and must support forces securely at very high speeds. The bearings are therefore selected predominantly according to the criteria of accuracy, rigidity and running behaviour. In order that they can fulfil these tasks securely, they must run without wear. This requires the formation of a load-bearing hydro- dynamic lubricant film at the contact points of the rolling contact partners. Under these conditions, the bearings will achieve their fatigue life in a large number of applications....

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Super Precision Bearings

Super Precision Bearings

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