High-Quality Rotary Table Bearing - Precision Rotary Solutions for Heavy Load Applications-LYMC Slewing Bearing

Rotary Table Bearing Structure

Seals and Lubrication

Prevent dust, moisture and impurities from entering the bearing while keeping the grease from leaking. Often made of synthetic rubber or fluoro rubber, they have good sealing and temperature resistance. Most designs have lubricating oil holes or grease channels for easy regular maintenance. High-end products often use pre-filled grease design for longer service life.
Cage/Spacer

Maintain the spacing between rolling elements to prevent mutual contact and reduce friction and wear. There are many materials to choose from, such as plastic, brass, steel, etc., depending on the use environment.
Rolling Elements

Cylindrical Rollers or Crossed Rollers are usually arranged in V-shaped or X-shaped grooves, and can bear loads in multiple directions at the same time. Cross roller arrangement can greatly improve rigidity and load-bearing capacity.
Inner Ring & Outer Ring

The basic structural part of the bearing, usually with mounting holes to facilitate connection with the equipment. Depending on the design requirements, it may have a flange structure or positioning grooves.

Features Of The Rotary Table Bearing

Adaptability to Complex Applications

There are many types of rotary table bearings, including crossed roller bearings, axial angular contact ball bearings, etc., which can be selected according to different application requirements. They can be used in occasions with high requirements for running accuracy, rigidity, load capacity and speed, such as rotary tables of precision machine tools, CNC turntables, testing instruments, medical equipment and rotating parts in various automation equipment. Some high-end bearings even integrate magnetic measurement systems to achieve non-contact high-precision measurement of angles.

01
Integrated and Easy to Install

Many rotary table bearings are pre-assembled, pre-lubricated units with mounting holes on the outer and/or inner rings. This design makes the bearing installation process easier and faster, reducing the need for additional tools and complex alignment, thereby reducing assembly time and costs.

02
Optimized Friction and High Speed Potential

Modern rotary table bearings are designed to reduce friction torque, which not only reduces energy loss, but also reduces the temperature rise of the bearing during operation. Lower temperature rise helps maintain the thermal stability of the machine tool and further improves machining accuracy. At the same time, reduced friction also allows the bearing to reach a higher limit speed to meet the needs of high-speed machining.

03
Compact Design

Compared with the traditional solution consisting of multiple independent bearings, rotary table bearings are usually highly integrated and compact. For example, many rotary table bearings integrate the functions of radial and axial bearings into one, which greatly simplifies the design of adjacent structures, saves installation space, and reduces overall manufacturing costs.

04
High Rigidity and Precision

In order to ensure high precision in the processing of machine tools and other equipment, rotary table bearings usually have very high stiffness. This means that under load, the deformation of the bearing is minimal, thus ensuring the positioning accuracy and smooth operation of the rotating parts. They can achieve extremely low radial and axial runout accuracy (usually in the micron level), which is crucial for demanding precision processing.

05
High Load Capacity

The rotary table bearing can bear radial load, axial load and overturning moment at the same time. This is one of its most significant features, making it suitable for occasions that need to support heavy objects and complex forces. Its special design, such as the cross roller bearing, usually installs two sets of raceways and rollers at right angles, which can effectively disperse and bear loads from multiple directions.

06

Rotary Table Bearing FAQ

What is a rotary table bearing?

A rotary table bearing is a high-precision bearing designed to support rotating tables, indexing systems, and machine tool turntables. The bearing can simultaneously handle axial loads, radial loads, and tilting moments while maintaining high rotational accuracy.

Manufacturers commonly use rotary table bearings in CNC machining centers, vertical lathes, rotary indexing tables, robotics, and automation equipment.
What types of rotary table bearings are available?

The most common rotary table bearing types include:

Crossed roller rotary table bearings

Angular contact rotary table bearings

YRT rotary table bearings

Thin section rotary table bearings

Integrated rotary table bearing units

Each type serves different requirements for speed, rigidity, load capacity, and positioning accuracy.
Why do CNC machines use rotary table bearings?

CNC machines require extremely precise rotational movement during machining operations. Rotary table bearings provide:

High rigidity

Low rotational runout

Accurate positioning performance

Stable load distribution

Smooth rotation under heavy cutting forces

These characteristics help improve machining accuracy and surface finish quality.
What is the difference between a crossed roller bearing and a YRT bearing?

A crossed roller bearing uses cylindrical rollers arranged in alternating directions. This design offers compact dimensions and high rigidity.

A YRT bearing combines axial needle roller bearings, radial roller bearings, and precision rings into one integrated structure. YRT bearings generally provide higher rotational accuracy and are commonly used in high-end CNC rotary tables.
How do I select the correct rotary table bearing?

You should evaluate several technical factors before selecting a rotary table bearing:

Axial and radial load requirements

Tilting moment load

Rotational speed

Installation space

Positioning accuracy

Rigidity requirements

Lubrication conditions

Operating environment

A properly selected bearing improves machine stability and extends service life.
What materials are commonly used for rotary table bearings?

Most rotary table bearings use high-quality chrome bearing steel because it provides excellent hardness and fatigue resistance.

For special applications, manufacturers may also offer:

Stainless steel rotary table bearings

Hybrid ceramic rotary table bearings

Vacuum-compatible bearing materials

Corrosion-resistant coatings

These options support medical, semiconductor, aerospace, and clean room applications.
Can rotary table bearings operate at high speed?

Yes. Many precision rotary table bearings support high-speed rotation when manufacturers optimize preload, lubrication, and internal geometry.

However, excessive speed may generate additional heat and reduce bearing life if lubrication and cooling are insufficient.
What causes rotary table bearing failure?

Several factors can reduce bearing performance or cause premature failure:

Improper installation

Excessive preload

Contamination from dust or coolant

Poor lubrication

Overloading

Misalignment

High operating temperatures

Routine maintenance and correct installation practices significantly improve bearing lifespan.
How often should rotary table bearings be lubricated?

Lubrication intervals depend on operating speed, load conditions, temperature, and working environment.

High-speed CNC applications usually require regular grease replenishment or oil-air lubrication systems to maintain stable performance.

Manufacturers typically recommend maintenance schedules based on operating hours.
What are the advantages of thin section rotary table bearings?

Thin section rotary table bearings help reduce equipment size and overall weight while maintaining precision rotation performance.

Engineers often select thin section designs for compact automation systems, robotic joints, and lightweight rotating platforms.