Before the Cross Roller Bearing does not appear, the lathe spindle is generally bearing the traditional structure of the traditional bearing structure is mainly dependent on thrust ball bearings to support the work of thrust ball bearings can withstand axial force, so the bearings are mainly used to bear the weight of the workpiece; and cylindrical roller bearings are mainly used for radial positioning and bear external radial force. This kind of design is widely used. And the cost is relatively low.