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加工原理由图1可知，用平面A－A倾斜于圆柱并与其相截。截平面是一个椭圆。椭圆的大小随截平面对圆柱的倾斜程度而变，但它的短轴总与圆柱的直径相等，且斜截面的倾角a可按cosa=d／D算得。其中D为椭圆的长轴直径，d为椭圆的短轴直径。目具体操作步骤1）将工件安装在工作台上，
Machining principle It can be seen from Figure 1, with plane A-A inclined to the cylinder and its intercept. The section plane is an ellipse. The size of the ellipse varies with the degree of inclination of the section plane to the cylinder, but its minor axis is always equal to the diameter of the cylinder, and the inclination a of the oblique section can be calculated as cosa = d / D. Where D is the major axis diameter of the ellipse and d is the minor axis diameter of the ellipse. The specific operation steps 1) the workpiece is mounted on the workbench,