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Steinmeyer Ball Screws. Precision, quality and reliability.

Steinmeyer Ball Screws. Precision, quality and reliability.
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Steinmeyer Ball Screws. Precision, quality and reliability.

Product catalog summary
Introduction
Steinmeyer Ball Screws are known for their precision, quality, and reliability, used in various applications such as machinery and aerospace. The company, August Steinmeyer GmbH & Co. KG, has been a leader in ball screw production since the 1960s.

Company History
Founded in 1920, Steinmeyer initially specialized in micrometers and began producing ball screws in the late 1960s. The company has expanded its facilities in Albstadt, Suhl, and Dresden.

Philosophy and Standards
Steinmeyer focuses on tradition, quality, and innovation, designing ball screws to meet modern machinery demands. They emphasize customer requirements and continuous improvement.

Applications
Ball screws are used in machinery, optical instruments, medical engineering, and aerospace for dynamic and backlash-free power transmission. Special designs are available for unique environments.

Certification and Quality
Steinmeyer adheres to high-quality standards, certified under EN 9001 and EN 9100, ensuring comprehensive quality requirements.

Product Range
The catalog includes a wide range of ball screws, from miniature to heavy-duty, with custom designs available.

Technical Information
The document provides detailed technical information on precision, lead accuracy, friction torque, geometric tolerances, preload and rigidity, service life calculations, and more.

Conclusion
Steinmeyer Ball Screws are critical components in many industries, offering unmatched precision and reliability.
Precision and Standards
The document explains DIN/ISO standards for ball screws, detailing lead accuracy, friction torque, and geometric tolerances. Steinmeyer uses ISO/DIN accuracy classes 1, 3, 5, 7, and 10.

Lead Accuracy
Defined by parameters like lead compensation and permissible lead deviation, with a table of limits for average lead error.

Friction Torque
Defined for preloaded ball screws, influenced by accuracy class and preload value, with tables for variation based on screw length.

Geometric Tolerances
Outlines rules for run-out tolerances and perpendicularity, with stricter parameters than DIN values.

Mounting Tolerances
Recommendations for maintaining mounting tolerances to ensure proper operation and longevity.

Preload and Rigidity
Discusses different nut types and their preload, explaining the impact on efficiency and suitability for long screws.
Nut Designs and Preload
Preload eliminates play and increases rigidity in ball nuts. Steinmeyer uses a gothic arch profile for preload.
  • Double Nut (UNILOCK): Offers higher rigidity but is longer and more costly.
  • Lead-Offset Nut: More compact but requires more machining.
  • Pitch-Offset Nut: Extremely compact, used mainly with miniature ball screws.
  • Spring Preloaded Double Nut: Maintains constant preload but is bulkier and more expensive.

Rigidity and Preload
Rigidity is crucial for positioning accuracy, influenced by preload settings.

Service Life Calculations
Service life is determined by material fatigue, with preload accounted for in life calculations.
Specifications and Procedures
Discusses calculation of modified loads for nuts with 4-point contact and duty cycle of machine tools.

Service Life Calculations
Equivalent load is calculated based on dynamic load capacity and fatigue life, with formulas for mean load and equivalent speed.

Fatigue Life and Load Capacity
Explains dynamic load capacity and reliability percentages, comparing ANSI and ISO/DIN standards.

Buckling and Maximum Load
Identifies failure modes due to overload and provides buckling analysis using Euler equations.

Fracture Load and Critical Speed
Discusses fracture load considerations and critical speed, with recommendations to avoid resonance issues.
Technical Overview
Discusses dynamics of ball screws, focusing on critical speed, pre-tensioning, and maximum speed limitations.

Maximum Speed Limitations
Provides tables for maximum rotational speeds for UltraThrust ball screws.

DN Value Explanation
Explains DN as a method to estimate maximum rotational speed, with recommendations for specific DN limits.

Bearing Journal Design and Pre-Tensioning
Outlines importance of proper bearing journal design and pre-tensioning.

Selecting Support Bearings
Advises on selecting support bearings with sufficient load capacity.

Lubrication and Wipers/Seals
Discusses importance of selecting the right lubricant and types of wipers.
Lubrication and Wipers/Seals

Tribology Oil/Grease Testing
Tested lubricants under conditions similar to ball screws.

Theory of Elasto-Hydrodynamic (EHD) Lubrication
EHD lubrication is crucial for ball screws, requiring sufficient oil and appropriate viscosity.

Oil Lubrication
Requires an oil port and wipers, with recommended oil quantities and grades.

Grease Lubrication
Manual re-lubrication should use compatible grease, with specified intervals and quantities.

Hybrid Ball Screws
Feature steel screws and nuts with ceramic balls, suitable for minimal lubrication.

Ball Return Systems
Various designs affect maximum operational speed.

Materials
Lists materials used for shafts, nuts, and balls.
Materials and Processes
Outlines materials and processes certified under SAE designations, including heat treatment and surface treatment.

Definitions
Provides definitions for technical terms related to shaft mechanics.

Ball Screws Numbering System
Describes the numbering system for ball screws, detailing specifications.

Miniature Ball Screws
Used in precision applications, highlighting optiSLITE technology.

Technical Data and Specifications
Provides detailed technical data for various nut types and shaft styles.
Overview
Steinmeyer has over 50 years of experience in ball screw drives, specializing in aerospace applications.

Capabilities
  • Built-to-print: Production based on existing designs.
  • Built-to-spec: Custom development and manufacturing.
  • Engineering Services: Design and development support.

Product Groups
  • Ball Screws for Flap Actuators: Solutions include spherical and gimbal suspensions.
  • Ball Screws for Electromechanical Actuators: Cost-optimized solutions.
  • Ball Screws for Brake Actuators: High load capacity designs.
  • Ball Screws for Aerospace and Unmanned Air Vehicles: Titanium versions for space travel.

Technical Features of Rotating Nuts
  • Mass-balanced design for higher speeds.
  • Improved axial and torsional stiffness.

Precision Lead Screws
  • Characterized by high precision and long service life.

Contact Information
August Steinmeyer GmbH & Co. KG, Riedstraße 7, 72458 Albstadt, Germany. Phone: +49 (0) 7431 1288-0, Email: [email protected], Website: www.steinmeyer.com
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Catalog excerpts

Steinmeyer Ball Screws. Precision, quality and reliability.-1

Steinmeyer Ball Screws. Precision, quality and reliability.

 Open the catalog to page 1
Steinmeyer Ball Screws. Precision, quality and reliability.-2

Welcome to where precision is.

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Steinmeyer Ball Screws. Precision, quality and reliability.-3

Welcome to Steinmeyer – Your reliable partner for ball screws. Ball screws in all sorts of designs. Reliable and individual counseling. The optimal implementation of your wishes are Innovation, precision, quality, reliability and dura- A skilled contact person at Steinmeyer is at your our main focus. The expertise of our technical bility have distinguished our ball screws for disposal before and after your purchase. advice combined with numerous standard and decades. First-class materials and sophis- special solutions offers many options for your ticated manufacturing technology are always Whether...

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Steinmeyer Ball Screws. Precision, quality and reliability.-4

Welcome to where precision is. History. Production of ball screws of a factory plant which occupies some 8 acres of land today. The original house still exists, but has since been converted into office and meeting The Steinmeyer company was founded by Mr. August Steinmeyer in 1920. One year later, in 1921, he decided to specialize in micrometers, Beginning in the late 1960‘s, ball screws have which was to become the product range for been manufactured at the Albstadt factory. About which the small company was soon to be recog- 10 years later, this new product line outgrew the nized in the domestic...

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Steinmeyer Ball Screws. Precision, quality and reliability.-5

Our Philosophy. Tradition, quality and innovation. Modern machine design places high demands mance and life figures from its linear drives. proved processes over and over again – with Steinmeyer is committed to being at the cutting not the slightest deviation. From raw material edge – always. to the finished component to its maintenance during the entire life cycle, from design and de- on precision and reliability of its linear drives. Ball screws, which have become an indispens- Our standard: Highest quality. velopment to qualification testing – everything must be done in a well controlled environment...

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Steinmeyer Ball Screws. Precision, quality and reliability.-6

Welcome to where precision is. Areas of application. Precision where it counts. chatronic applications. Such applications require shafts and nuts are matched to »nearly backlash the lowest possible friction. free« they often perform better compared to other drive types. Today ball screws are used in a widely varying range of applications. Precision ball screws from Ball screws quite often have to survive special 20 to over 100 mm in diameter are an indis- environments such as Ultra High Vacuum in elec- Applications in aerospace have quite different pensable element for positioning and infeed...

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Steinmeyer Ball Screws. Precision, quality and reliability.-7

Certification. Certified processes are a matter of course. We achieve high precision products through our high quality standards. To ensure the comprehensive quality requirements by certified processes under quality management systems.

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Steinmeyer Ball Screws. Precision, quality and reliability.-8

Welcome to where precision is. Precision at a glance. Technology Miniature ball screws diameter 3 - 16 mm Large ball screws diameter 16 - 125 mm Heavy duty ball screws ultra thrust diameter 32 - 160 mm Ball screws for aerospace applications Rotating nuts Precision lead screws This catalog contains the product range of Stein- cuits are possible – as a custom unit. meyer ball screws and is divided into several product Please contact us for details. categories. Because it is not possible to show all special forms and modifications please contact us to review your requirements. And please note that...

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Steinmeyer Ball Screws. Precision, quality and reliability.-9

A summary of all important criteria for the selection of an applicable ball screw including service life calculations, assembly recommendations, lubrication and maintenance. Standard program for diameter 3 to 16 mm with several nut designs and standard shafts. The product range for machine industry. Standard nuts according to DIN / ISO, rotating nuts to enable assembling bearings directly. Ball screws are always made according to a drawing. Special design with extra large balls and matched ball return system. Ball screws are always made An overview of particular solutions, processes and materials...

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Steinmeyer Ball Screws. Precision, quality and reliability.-11

T E C H N I C A L I N F O R M AT I O N The following chapters only show a small portion of the wide field of applications for ball screws. In order to meet all the technical and commercial demands for such a wide variety of different tasks, a deep understanding of the technology of ball screws is absolutely necessary. We have collected extensive information about ball screws in this section of this catalogue and hope that you will find it useful. Please be aware that although we edited this information as carefully as possible, we cannot be held responsible for missing or incorrect information....

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Steinmeyer Ball Screws. Precision, quality and reliability.-12

PRECISION (LEAD ERROR, FRICTION TORQUE, CRITICAL TOLERANCES) Under the headline „precision" DIN / ISO standards are explained as they apply to ball screws, how accuracies are defined, and the acceptance or specification criteria derived from these standards. Lead accuracy Friction torque Roundness, concentricity and squareness of relevant surfaces In general, all acceptance criteria should be reviewed and agreed upon between Steinmeyer and our customer. This is especially relevant for those applications where special demands are required, for example a lead accuracy of class 5 but friction torque...

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Steinmeyer Ball Screws. Precision, quality and reliability.-13

Positioning ball screws Transport ball screws The DIN standard differentiates between positioning ball screws and transport ball screws. Positioning ball screws are normally used in high-precision applications (like machine tool) and are usually equipped with a ground ball thread. Transport ball screws are predominantly used for travelling and moving applications. Typical applications are axes for handling systems. Ball thread of such screws is usually rolled or whirled. Per DIN standard the tolerance classes for positioning ball screws are described as "P" while the transport ball screws classes...

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Steinmeyer Ball Screws. Precision, quality and reliability.-14

Lead error fluctuation over entire travel Accuracy class [¹ n/a for rolled and whirled ball screws] TECHNICAL TIP The fluctuation of the lead error is defined by two lines parallel to the line representing the average lead error, which include the entire lead error graph. The lead error fluctuation is applicable to precision ground positioning screws in accuracy classes 0 - 5 only. It does not apply to general purpose screws which are typically either rolled or whirled in classes 5 - 10. Lead error fluctuation per 300 mm The variation over 300 mm is the most common definition. However it is also...

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