Part 3D Design and Draft According to CSG (Constructive Solid Geometry) and Its Application to Three CAD Software: Solid-Edge ST 2021, Onshape, AutoCad

Abstract

For an Industrial Engineer it is important to have some basic knowledge about standards in Technical Drawing concerning drafts to define a part or an assembly. International ISO standards indicate the way drafts must be correctly drawn. These standards concern many aspects as needed views, cutting planes, auxiliary views, dimensions, etc. Obviously nowadays models in 3D and drafts are done with CAD software. On the other hand, as teachers with long experience of first year in the Higher Technical School of Industrial Engineering of the UPM (Polytechnic University of Madrid) we have observed that new students have little knowledge in this special aspect of Technical Drawing. This communication presents a tool, Constructive Solid Geometry, which provides the student with a systematic way to analyze a part in order to draw the necessary views and dimensions so that the part is completely dimensioned. Three powerful CAD programs with free educational version have been used to design the 3D model and the draft. We consider it is very interesting to compare them with the aim of being the most indicated for our students, always considering the kind of design they must afford. In this communication we will do the 3D model and draft of two parts using Solid_Edge ST2021, Onshape and AutoCad. At the end, we will summarize our experience with the three programs.