Commonly used bearing types in machine tool spindles include:
1. Deep groove ball bearings: This type of bearing is mainly used to bear radial loads. Since their clearance has been adjusted before leaving the factory, and the clearance is not adjustable, they are often used in situations where accuracy is not high and preloading is not required, such as ordinary drilling machine spindles.
2. Angular contact ball bearings: This kind of bearing can bear both radial and axial loads. They need to be installed in pairs and can be preloaded to increase the stiffness of the spindle. Angular contact ball bearings have various contact angles, such as 15°, 25°, 40°, etc. Each angle of bearing has its specific application scenarios.
3. Bidirectional thrust angular contact ball bearing: The contact angle of this kind of bearing is usually 60°, which is suitable for occasions that need to bear bidirectional axial load. They are often used in combination with double row cylindrical roller bearings and are used on the spindles of lathes, grinders, drilling machines, milling machines, boring machines and other machine tools.
4. Double row cylindrical roller bearings: This kind of bearing can withstand larger radial loads and allows higher rotational speeds. They are often used on machine tool spindles that rotate at high speeds.
5. Tapered roller bearings: Tapered roller bearings also have high speed and load-bearing capacity, and can bear both radial and axial loads. If it is a double row tapered roller bearing, it can also bear bidirectional axial load.
Each of these bearing types has its own characteristics. According to the specific needs and performance requirements of the machine tool, the appropriate bearing type can be selected for use.