How can I improve the stability of the guiding system? Let's take a look at how you can improve the stability of your rail system. As the machine tool work parts move, the balls circulate in the bracket grooves, spreading the amount of bracket wear to each ball, thereby extending the service life of the linear guides.

The stability of the rail system can be improved by eliminating the gap between the bracket and the rail by preloading. The preload is obtained by installing an oversized steel ball between the guide rail and the bracket. The diameter tolerance of the steel ball is 20 microns. The balls are screened and graded in 0.5 micron increments and then individually mounted on the rails. The preload depends on the force acting on the ball. If the force acting on the steel ball is too great, the steel ball will be preloaded for too long, resulting in an increase in the movement resistance of the bracket.

There is a balance problem here; in order to improve the sensitivity of the system and reduce the resistance of motion, the preload should be reduced accordingly, and in order to improve the accuracy of the motion and the accuracy of the maintenance, it is required to have enough negative preload, which are two contradictory aspects. The design of the guide rail system strives to have a large contact area between the fixed element and the moving element, which can improve the bearing capacity of the system, and at the same time can withstand the impact of intermittent cutting and gravity cutting, so that the force spreads, thereby expanding the bearing area.

In order to achieve this, the groove shape of the rail system is diverse, and there are two more representative ones, one is called Gordian (pointed arch), the shape is an extension of the semicircle, and the contact point is the vertex; the other is the circular arc, which can also play the same role. No matter what kind of structure, there is only one purpose, more ball radius in contact with the guide rail (fixing piece). The factors that determine the performance characteristics of the system are how the rolling elements come into contact with the guide rails, which is the key to the problem.

There is a large contact area between the fixed element and the moving element as much as possible, which can improve the bearing capacity of the system, and can also withstand the impact force generated by intermittent cutting or gravity cutting, so that the force spreads. , expand the bearing area. In order to achieve this, the groove shape of the rail system is diverse, and there are two more representative ones, one is called the Gordian type (pointed arch type), the shape is an extension of the semicircle, and the contact point is the vertex; the other is the circular arc, which can also play the same role.