分度头的分度方法,一般有单动分度法,差动分度法与复式分度法三种,其中最常用的是单动分度法。但是,有些齿数用单动分度法不能分割,如甲型孔板对61、63、67……122……等齿数,乙型孔板对51、53、57、59、61……102……等齿数,都不能用单动分度法来分割。这些数大多是质数和 Dividing the indexing method, there are generally single-move indexing method, differential indexing method and duplex indexing method, of which the most commonly used is the single-motion indexing method. However, some of the number of teeth can not be divided with single-division method, such as A plate orifice 61,63,67 ...... 122 ...... and so on, B orifice plate 51,53,57,59,61 ... 102 ... ... and other teeth, can not be divided using single-division method. Most of these are prime numbers and