在面角度中,90°是应用得最多的值。机械、仪器仪表的另、部件间,另件的轴线和基面、轴线和轴线,面和面间都往往具有垂直度的要求。值得注意的是:很多精密另、部件要求其轴线或面在X、Y、Z三个坐标方向保持互相垂直,在测量和加工中,则要求绕X、Y、Z三根轴准确地转过90°解决这些 In the face angle, 90 ° is the most applied value. Machinery, instrumentation, the other, between components, the other parts of the axis and the base surface, axis and axis, surface and surface are often the degree of verticality requirements. It is noteworthy that: a lot of precision other, parts require its axis or plane in the X, Y, Z three coordinate directions perpendicular to each other, in the measurement and processing, it is required around the X, Y, Z three axes accurately 90 ° Solve these