八角手孔-边组合方式与分度的关系研究

Study on Relation of Hole-edge Combination of Eight-square Hand and Indexing

八角手是最常用的宝石加工卡具,主要功能是实现宝石加工过程中分度的变化。分度的变化是通过八角手孔-边组合实现的,孔-边组合方式受孔位分布的影响。以最常用的64分度八角手为例,通过图解法和列表法,分析八角手孔位的分布原则,得出八角手的8个孔位应该分布在以正八边形模块对角线为基础,对圆形分度盘64等分,等分线与圆相交所形成的非八次对称点上。得出八角手的8个孔位是非八次对称的。并比较了3种不同形式孔位分布所形成的孔-边组合与分度的关系,得出孔位分布越规律、越集中,孔-边组合与分度的关系越简易、越直观,总结出三种孔-边组合方式与分度关系的计算公式,可以方便宝石加工人员在生产中变换分度操作的实用性,提高宝石加工的劳动生产力。

Eight-square hand is a common gemstone processing chucking appliance and the main function is to provide the accurate indexing variation of the gemstone processing. The indexing variation is achieved by the association between hole and edge,which is influenced by the distribution of hole position. In this paper, as an example, the distribution rule of the hole of sixty-four indexing eight-square hand is analyzed by graphic method and tabulation method. The conclusion is that eight holes of eight-square hand are non-symmetric. After comparing the three different relationships of hole-edge combination and indexing, the re- sults show that the indexing variation will be easily achieved through hole-edge combination when the hole distribution is regular and concentrated. Also three formulas of hole-edge combination and indexing are summarized, improve labor productivity. which will facilitate the gemstone processing and