机械制图的主要任务是培养学生识图和绘制机械图样的能力。在机械制图教学中，培养学生的空间想象力是一个非常重要的问题。而我们招收的学生是没有学过立体几何的初中学生，空间想象能力较差。在教学过程中，多数学生对机械制图感到难学，少数同学甚至有一种恐惧感。因此，要 The main task of mechanical drawing is to develop students’ ability to draw pictures and draw mechanical drawings. In the mechanical drawing teaching, cultivating students’ space imagination is a very important issue. The students we enrolled in did not learn three-dimensional geometry of junior high school students, poor spatial imagination. In the process of teaching, most students feel hard to learn mechanical drawing, a few students even have a sense of fear. So, want