One is called conversion coefficient method, the other is quantity regulation method with equal matters.
一种方法称为换算系数法，另一种方法是等物质的量规则法。
This paper presents a method for machining of taper cutting tools with equal helix Angle. The principle of the method is using taper helical curve with equal pitch to approach equal Angle one.
文章提出了一种在经济型数控机床上实现等螺旋角圆锥螺旋线的加工方法，其原理是用等导程螺旋线去逼近此种曲线。
Riffle division method: a riffle is a kind of non-mechanical sample divider, which is usually fed manually. The sample is divided into 2 equal parts by riffle, with one retained and one rejected.
③二分器缩分法：二分器系非机械式样品缩分器，通常用手工给料，样品通过二分器被分成二等份，一份保留，另一份弃去。
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