复式单动分度法就是当工件等分数z和分度头定数40不能相约,或者相约后分度板上仍没有所需要的孔圈时,将等分数z分解成两个不能相约并且可以做单式分度的等分数z_1和z_2进行单式分度。先用分度手柄转动n_1转,分度铣削一周,然后将分度手柄连同分度板一起转动n_2转,分度铣削一齿,再按第一次分度的方法铣削第二周,直到铣完为止。即: The single-action indexing method is that when the workpiece equals z and the indexing number 40 can not be matched, or the concentric index ring still does not have the required aperture, the equal part z is decomposed into two irreconcilable and can be done Single-scale indexing z_1 and z_2 single indexing. First use the indexing handle rotation n_1 turn, indexing milling a week, and then the indexing handle along with the indexing plate rotation n_2 turn, indexing milling a tooth, and then the first indexing method of milling the second week until the milling Finished. which is: