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A groove or ridge made of metal or other material that bears, holds, guides and reduces friction of moving equipment or equipment. Longitudinal grooves or ridges on the surface of a rail used to guide and secure machine parts, special equipment, instruments, etc. Guide rails, also known as slide rails, linear guide rails, and linear slide rails, are used in linear reciprocating motion occasions. 
They have a higher rated load than linear bearings, and can bear a certain torque at the same time, and can achieve high-precision linear motion under high load conditions. . The sliding guide has the advantages of simple structure, convenient manufacture and high contact rigidity. However, the traditional sliding guide rail has large friction resistance, rapid wear and tear, and the difference between the dynamic and static friction coefficients is large, and the phenomenon of crawling is easy to occur at low speed. 
In order to improve the positioning accuracy and motion stability of CNC machine tools, plastic guide rails have been widely used in CNC machine tools at present. Its friction factor is small; and the dynamic and static friction factors are similar, the motion stability is good, and it can prevent the phenomenon of low-speed crawling; it has good wear resistance, self-lubricating effect and vibration resistance.