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Common bearing categories in CNC turntables
Nov 15, 2018

CNC turntable is widely used in various CNC milling machines, boring machines, various vertical vehicles, vertical milling and other machine tools. In the design of the turntable, the types of bearings used are roughly divided into several types.

1. Thrust ball bearing + cylindrical roller bearing: Thrust ball bearing can withstand certain axial force, so the bearing is mainly used to bear the weight of the workpiece; and cylindrical roller bearing is mainly used for radial positioning and external force (eg cutting force, milling force, etc.). This type of design is widely used and relatively cheap.

2. Static pressure bearing + precision cylindrical roller bearing: Static pressure bearing is a kind of sliding bearing that relies on externally supplying pressure oil to establish a static pressure bearing oil film in the bearing to achieve liquid lubrication. Hydrostatic bearing always works under liquid lubrication from start to stop, so it has features of no wear, long service life and low starting power. In addition, this bearing also has the advantages of high rotation precision, large oil film stiffness, and can suppress oil film oscillation. Precision cylindrical roller bearings have good radial bearing capacity, and thanks to the use of precision bearings, the turnable's rotation accuracy is also well guaranteed. The turrets of this type can withstand high axial forces. Some workpieces weigh more than 200 tons 

3. Cross roller bearing: the application of cross roller bearings on the turntable is also relatively common. Cross roller bearings are characterized by two raceways in the bearing and two rows of rollers arranged in a row. Compared with the traditional thrust bearing + radial centering bearing combination, the cross roller bearing is compact, and simplifies the workbench design, thus reducing the cost of the turntable.

In general, the bearing, as the spindle and core component of the CNC turnable, plays a decisive role in the performance of the CNC turnable. In order to select the proper size and type of bearings, we need to consider various working conditions.