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Rotary table bearings, also often called slewing bearings or turntable bearings, are a special type of large bearings, mainly used in rotating mechanisms that need to withstand radial, axial and overturning moments at the same time. They are usually used in CNC machine tools, turntables, indexing heads, industrial robot joints, cranes, excavators, wind turbines and other equipment that require high precision and rigidity.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
