工程图样第一角画法和第三角画法的异同分析

Research on the Similarities and Differences between First Angle Method and Third Angle Method of Engineering Graph

产品的图样在国际上通常的画法有第一角和第三角画法两种,本文通过对这两种画法的分析,对二者的异同进行了详细的对比,提出了这两种画法的近似转换方法,为阅读图纸提供参考依据。

There are two general international drawing methods： first angle method and third angle method. By analyzing and comparing these two methods, this paper proposes an approximate converting method, which provides a good reference for reading the graph.