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大直径(大于150mm)而且锥体高度较小(小于50mm)的特殊外锥体(制件或塞规),如果在正弦尺上测量,一是不好装夹,二是由于太重,会使正弦尺所垫量块产生较大弹性变形,因而测量误差大,不能保证测量精度。如果用圆棒(或钢球)、千分尺,在0级平板上测量,由于锥体斜角α的公差较小,同样不能保证测量精度。我们采用了在测长机上用双棒法测量,不但能保证测量精度,而且能测量锥体的小头直径。
Special outer cone (part or plug gauge) with large diameter (more than 150mm) and smaller cone (less than 50mm), if it is measured on the sine scale, the first is not good clamping, the second is too heavy, will So that the amount of sine foot cushion block have a greater elastic deformation, and thus measurement error, can not guarantee the measurement accuracy. If the rod (or steel ball), micrometer, measured on a 0 level plate, due to the smaller cone angle α tolerance, the same can not guarantee the measurement accuracy. We used the dipstick method on the length measuring machine to measure, not only to ensure the measurement accuracy, but also to measure the cone’s small head diameter.