用“量取法”和“模板”简化国标轴测图中的椭圆近似画法

提出了用近似画法画国标规定的三种轴测图中椭圆的方法—量取法。用量取法可以按一定比例直接量出各段圆弧半径和圆心位置,减少了作图辅助线,达到简化作图的目的。同时设计了量取法所使用的椭圆模板和轴测尺介绍了其使用方法。

Approximate Constuction of Ellipses in Axonomitric Drawing by Chinese Standard with "Former" and "Measurement Method"

The measurement method is given, by which the ellipses for three kinds of axonomitric drawings by the Chinese standard may by approximately constructed. The radius and the positions of the centers of circles can also be measured directly by a given scale, therefore the number of auxiliary lines can be decreased and the drawing process simplified. The "former" is a series of ellipses pattern plates which are made according to the scale of the measurement method. They are the convenient means of drawing ellipses.