“机械工人”(冷加工)57年2期介绍了孙宗武同志编译的“单动间隔分度法”一文。该文所介绍的方法有两个优点:1)操作方法比复式分度法简单;2)不论铣伞齿轮和螺旋齿轮都可以用来分割单动分度法所不能分割的数。但也有两个缺点:1)计算麻烦;2)误差较大。现在介绍一种复孔单动间隔分度法,它适用于等分数不是质数,并且分解因子后因子不大于孔柜之最大孔数。这个方法即不象复式分度法那样每次分度都要费两次手续,又没有单动间隔分度法那样的误差,计算也很简单;它具 “Mechanical Workers” (Cold Working) 57 2 The article introduces the article entitled “Single-action interval division method” compiled by Comrade Sun Zong-wu. The method described in this article has two advantages: 1) The method of operation is simpler than the multiple indexing method; and 2) the number of bevel gears and helical gears can be used to divide a number that can not be divided by a single indexing method. But there are two disadvantages: 1) Computation trouble; 2) Big error. We now introduce a single-hole multi-aperture interval indexing method, which applies to the fractional number is not a prime number, and the decomposition factor factor is not greater than the maximum number of holes hole cabinet. This method does not like the duplicate indexing method, as each sub-degree costs two procedures, there is no one-way interval division method that error, the calculation is very simple; it has