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Ball Screw Assemblies

Ball Screw Assemblies

Thomson ball screw assemblies consist of a ball screw, a ball nut with recirculating ball bearings and end supports for mounting. The interface between the screw and the nut is made by ball bearings that roll in matching forms in the ball screw and ball nut. The load on the ball screw is distributed over a large number of ball bearings so that each ball is subjected to a relatively low load. Because of the rolling element design, ball screw assemblies have a very low coefficient of friction, which equates to highly efficient mechanics.

 

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Why Choose Ball Screw Assemblies?

Ball screw assemblies provide an excellent method for translating rotational motion to linear motion for many applications, including those where high loads and close tolerances are required. To apply the correct type of ball screw and nut assembly in a particular application, the design engineer must consider the advantages and capabilities of each. Selecting the right technology can reduce design complexity, improve performance and reduce the overall cost of the assembly.

This image compares the three types of ball return systems (from left to right): internal, button and external.

Mounting Options

Ball screws are mounted in either supported or fixed configurations. A supported end holds the ball screw at one focal point and does not resist bending moments. A supported end is generally easier to align and install than a fixed one, so installation costs are typically lower. A fixed end resists bending moment loads because it is typically based on two bearings spaced sufficiently so the ball screw remains perpendicular to the planes of the rotary bearings. The fixed offers greater column strength and higher critical speed. The image below illustrates four fixity options.

The assembly can be fixed at both ends, fixed at only one end and supported on the other, supported at both ends, or fixed at one end and free at the other.

Ball screw assemblies are not all alike. Whether it be metric ball screws, inch ball screws or miniature ball screws, key differences affect their performance and extend their lives. These include:

  • Design. Through extensive research and evaluations, Thomson engineers have been able to develop a comprehensive ball screw offering that delivers optimal solutions for countless applications. Available in a full range of diameters, leads and ball nut configurations, in either pre-loaded or non-pre-loaded types, and all in industry standard envelopes, our ball screws provide dependable accuracy and repeatability at an economical price.
  • Quality. With a vast background in countless applications, Thomson is uniquely positioned to provide the highest levels of quality across our full line of ball screw assemblies. Our fully equipped engineering laboratory performs qualification testing for mechanical performance, environmental effects and structural integrity. Your rotating ball screw nut assembly is inspected every step of the way to ensure top quality and performance.
  • Materials. The materials used to manufacture ball screw assemblies are critical to their performance. Our in-house metallurgists control and verify that the materials used are of the highest quality. They can also select and recommend materials best suited to your particular application.
  • Manufacturing. Thomson maintains the most modern and complete ball screw manufacturing facilities in the industry. In-house manufacturing capabilities include our proprietary heat treating and plating processes. Expert manufacturing using the most modern equipment available provides ball screw assemblies that set the standards for performance, precision and travel life.
  • Application Support. Working with Thomson is like having your own staff of ball screw design engineers able to address application concerns and recommend solutions. Thomson field sales and applications engineering personnel have more ball screw expertise than any other group in the industry. They are skilled at evaluating your requirements and designing assemblies that fit your needs.

Technical Articles

  • Because ball screws are available in both inch and metric dimensions, designers sometimes begin the specification process by selecting a product family based on the unit of measure. This decision may prematurely exclude the ideal product for the application and lead to significant losses in time, labor and expense. This article explains how sizing and selection questions centered on performance – instead of product monikers – can lead to more efficient linear motion designs.

  • Roller screws have been promoted as the only technology of choice for handling large loads when size is a constraint.?But in actuality, advances?in ball screw technology have now enabled the capability?to?support high-load applications as well. This is important because a high-load ball screw is typically less than half the cost of a comparable roller screw at equivalent performance points.?

  • 滾珠絲杠–協作機器人安全高效運動的秘訣

    Used in large-scale production applications that involve continuous lifting operations but still require a human touch, collaboration robots (cobots) are gaining popularity. A French?cobot?maker has developed a solution that uses ball screw and cable actuators instead of gears, setting a new benchmark for?cobot?efficiency and safety.

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