CNC machine tool is one of the most widely used industries of linear guide. High precision and high speed motion put forward very high requirements for the accuracy and quality of the guide rail. In addition, CNC machine tools usually need to move in a complex working environment, so the degree of high precision and long life is an important consideration for linear guides. The types of linear guides used in various CNC machine tools are also different, such as roller guides for high speed and high load while linear guides are suitable for accuracy and long life.