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What is the structure of the rotary table bearing?

A rotary table bearing, often used in applications requiring precision rotation, such as machine tools and rotary tables, has a specialized structure to support and facilitate smooth rotational movement. Here is an overview of the key components and structure of a rotary table bearing.

1. Bearing Type

Rotary table bearings are typically cross-roller bearings or YRT (Yaw and Roll Table) bearings, designed to handle axial, radial, and moment loads simultaneously.

2. Components and Structure

rotary table bearing

Inner and Outer Rings:

Inner Ring: Mounted on the stationary part of the rotary table, providing the raceway for the rolling elements.

Outer Ring: Attached to the rotating part of the table, also serving as a raceway for the rolling elements.

Rolling Elements:

Cross-Roller Bearings: Use cylindrical rollers arranged perpendicular to each other in a cross pattern, which allows them to handle high axial and radial loads as well as tilting moments.

YRT Bearings: Comprise an axial needle roller and cage assembly, a radial cylindrical roller, and two axial cylindrical roller and cage assemblies, ensuring high rigidity and precision.


Holds and guides the rolling elements, ensuring they remain evenly spaced and reducing friction.


Installed on both sides of the bearing to prevent contamination and retain lubrication, enhancing the bearing's lifespan and performance.

Preload Adjustment:

Many rotary table bearings come with a mechanism to adjust preload, ensuring optimal stiffness and minimizing deflection during operation.

rotary table bearing

3. Design Features

High Precision: Designed to maintain accurate positioning with minimal deflection, crucial for precision applications like CNC machines and indexing tables.

High Load Capacity: Capable of supporting heavy axial, radial, and moment loads due to the robust design and high number of rolling elements.

Integrated Design: Often integrated with mounting holes and flanges for easy installation and alignment.

4. Lubrication

Lubrication Channels: Incorporated within the bearing design to facilitate even distribution of lubricant, reducing wear and extending service life.

Lubrication Options: Can be grease or oil-lubricated, depending on the application requirements.

rotary table bearing

5. Applications

CNC Rotary Tables: Provide precise and stable rotation for machining operations.

Indexing Tables: Ensure accurate positioning in manufacturing processes.

Robotics: Used in joints requiring high precision and load capacity.

Medical Equipment: Enable precise movement in devices like MRI machines and surgical robots.

Understanding the detailed structure and components of rotary table bearings allows for optimal selection, maintenance, and application in precision machinery.

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