How to test the accuracy of precision CNC machining

For CNC lathes with different shapes of guide rails, which planes should be manipulated separately for straightness errors?

The common shapes of precision CNC machining intermediate guides are rectangular guides and V-shaped guides. The horizontal appearance of the rectangular guide rail controls the straightness error of the guide rail in the straight plane. The two peripheral surfaces of the rectangular guide rail control the linearity error of the guide rail in the horizontal plane.

For the V-shaped guide rail, because the guide rail is composed of two oblique surfaces, the two oblique surfaces not only control the straightness error in the straight plane, but also control the straightness error in the horizontal plane.

When the scraping method is used to repair the linearity error of the guide rail, most of the method is selected. The research point method is often used for the detection of shorter rails, because the flat ruler is simply deformed when it exceeds 2000mm, which is difficult to manufacture and affects the measurement accuracy. When scraping and grinding short guide rails in precision CNC machining, the straightness error of the guide rail is usually ensured by the accuracy of the flat ruler. At the same time, there is also a certain demand for the density of the grinding points per unit area, which can be based on the precision requirements in the precision CNC machining and the guide rail The nature and importance of the position in the middle of the processing is specified as not less than 10-20 points per 25mm×25mm (that is, the number of points per scraping square).

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