For the guide rails of different shapes, the straightness errors of which planes should each surface be controlled separately?
When CNC machining uses the scraping method to correct the straightness error of the guide rail, the grinding point method is mostly used. The grinding point method is often used for the inspection of shorter guide rails, because the flat ruler is easily deformed when it exceeds 2000mm, which is difficult to manufacture and affects the measurement accuracy. When scraping short rails,
The straightness error of the guide rail is usually ensured by the accuracy of the flat ruler. At the same time, there is a certain requirement for the density of the grinding points in the unit area, which can be separated according to the accuracy requirements in the processing center and the nature and importance of the position of the guide rail in the processing center. It is stipulated that there are no less than 10~20 points in each 25mm×25mm grinding point (that is, the number of points in each scraping square).
The common shapes of CNC machining intermediate guide rails are rectangular guide rails and V-shaped guide rails. The horizontal surface of the rectangular guide rail controls the straightness error of the guide rail in the pen plane. The two surrounding surfaces of the rectangular guide rail control the straightness error of the guide rail in the horizontal plane. For the V-shaped guide rail, because the guide rail is composed of two inclined surfaces, the two inclined surfaces not only control the straightness error in the straight plane, but also control the straightness error in the horizontal plane.