摘要
提供一种在一般位置平面上的直角辅助投射方法，直接求两面角，具有概念明确唯一，作图方法简单，可以适应钣金划线工作中制造卡角样板的实际需要。
A method of right angle auxilliary projection on an arbitrary plane is provided, by which the dihedral angle can be obtained directly.The method is simple and unique with a definite concept, and meets the practical requirement of making sample plates for measuring the angles in sheet metal drawing.
关键词
两面角
直角辅助投射法
钣金下料
作图法
auxilliary systems
dihedral angle
right angle auxilliary projection
