What is a spindle bearing?

Spindle bearings are specialised single-row, angular-contact ball bearings. They can support thrust loads in one direction and absorb radial, axial, and combined forces. They cannot be disassembled and have an open shoulder on the outer ring. Being pre-loaded, they can make the system free from any clearances. They have restricted tolerances and are ideal to be used in machine tools. The spindle bearings can be available in open or sealed designs.

Types of spindle bearings

The types of spindle bearings are as follows:

• Angular-contact ball bearings: When the bearing is in use, a contact angle is formed between the balls and the races.
• Radial or deep-groove bearings: They have an outer ring, an inner ring, balls, and a cage to separate the balls.
• Roller bearings: These bearings find use in rotary applications for replacing the sliding movement with a rolling motion.
• Thrust ball bearings: These are made for pure thrust loads.

Applications of spindle bearings

The spindle bearings are mainly suitable for applications that need guidance accuracy and high speeds. They can be used in diverse applications, ranging from belt-driven mechanical spindles to motorised spindles. It is also used in rotary unions for machine tools.