The purpose of the bearing is to reduce friction while providing support. Then there are two basic key elements, one is support stiffness, and the other is friction coefficient. In most cases, people certainly hope that the greater the support stiffness is, the better the friction coefficient is, but the reality is always difficult to match. In general, bearings can be divided into five categories, as shown below, air-float rails, hydraulic bearings, ball bearings, roller bearings, sliding bearings. From left to right, the coefficient of friction gradually increases, but at the same time the supporting stiffness gradually increases.

In general, bearings can be divided into five categories, air-float rails, hydraulic bearings, ball bearings, roller bearings, and plain bearings. From left to right, the coefficient of friction gradually increases, but at the same time the supporting stiffness gradually increases.

In general, people will choose ball bearings, ball bearings are the most widely used and most common.