The element function of linear guide system is like a bearing ring, which is installed on the support of steel ball in the shape of "v". The bracket covers the top and both sides of the guide rail. In order to support the parts of the machine tool, at least four supports are usually used for a set of linear guides. For supporting large mechanical parts, the number of supports can be more than four. When the components of the machine tool move, the steel ball will cycle in the groove of the support, apportioning the wear amount of the support to each steel ball, and then extending the service life of the linear guide.
In order to eliminate the gap between the bracket and the guide rail, preloading can increase the stability of the guide rail system and gain preload. It is to install a super scale steel ball between the guide rail and the bracket. The diameter of steel balls is ± 20 μ m in service. The steel balls are selected and classified in 0.5 μ m increments and installed on the guide rail; The size of the preload depends on the force acting on the steel ball. Assume that the force on the steel ball is too large, and the time to bear the preload is too long, which will easily lead to the increase of the movable resistance of the support, which will cause the imbalance; In order to improve the sensitivity of the system and stabilize the plot resistance, the preload is correspondingly reduced. However, in order to improve the plot accuracy and the persistence of the accuracy, it is required to have a satisfied pre negative number, which is contradictory.
