The first principle is the principle of automatic lamination of linear guide rail pairs: if you want to make the guide rail highly precise, you must make the guide rail pair have the characteristics of automatic lamination. The horizontal guide rail can rely on the weight of the moving member to fit the body; The rest of the rails require additional spring force or roller pressure to fit them together.
The second principle, the principle of total contact: to fix the length of the linear guide rail, it is necessary to ensure that the moving guide rail is at the two limits of the maximum stroke, and make full-length contact with the fixed guide rail, so as to ensure that the linear guide rail pair can complete the full contact during the contact process and make it reach a perfect state.
The third principle, the principle of compensating force deformation and thermal deformation: the linear guide rail and its supporting parts will be deformed when the force or temperature changes, so when designing the guide rail and its supporting parts, it is required to form the corresponding shape after deformation. For example, the beam guide of the gantry machine tool is made into a medium convex shape to compensate for the bending deformation caused by the weight of the headstock.
The fourth principle, the principle of proximity of dynamic and static friction coefficients: when designing linear guide rail pairs, the dynamic and static friction coefficients of the contact surface of the guide rail should be as close as possible, so as to obtain higher repeatability and low-speed stability.
The fifth principle, precision does not interfere with each other: the accuracy of linear guide rails will not affect each other during manufacturing and use, in order to obtain a higher accuracy coefficient.