Teaching solid modeling with autocad

Abstract

Solid modeling is the creation of an envisioned or existing part or assembly in digital solid form in 3D space. A digital solid is a 3D model consisting of vertices, edges, faces, and partially filled or entirely filled interior. It is a complete and unambiguous representation of the object in a precisely enclosed and filled volume in digital space. Solid models are used in many industries: engineering, manufacturing, marketing, entertainment, healthcare, etc. Modern manufacturing methods such as rapid prototyping, rapid manufacturing, and 3D printing use solid model geometries for production. AutoCAD is a computer modeling software from Autodesk that can be used to create 2D and 3D geometric models of products. It is the most popular CADD (Computer-Aided Drafting and Design) software in the market worldwide. In fact it is the software commonly used in introducing CAD (Computer-Aided Drafting) to students at High Schools, Junior Colleges and in many Universities. AutoCAD is unquestionably the most popular software for 2D design drafting but is not so commonly used in solid modeling. However, with good mastering, AutoCAD solid modeling is highly versatile and can be competitive in small and mid-sized engineering design and consulting firms who lack financial resources for investment in rapidly changing parametric solid modelers. This paper explores the teaching of solid modeling using AutoCAD. It presents a two phase procedural technique (planning and construction) that helps students to master solid modeling fundamentals. It is based on the author's experience from years of teaching design drafting with AutoCAD as one of the main software. The planning phase can become purely a mental exercise when properly mastered so this phase is independent of software. The construction phase is software dependent. The technique combines visual and operational skills that students need in design graphic modeling. The application of the procedure is not limited to AutoCAD software because the author has successfully used the same approach to teach Solid Edge, Inventor, and Solidworks. The solid modeling technique is outlined; illustrations and samples of classroom presentations are provided.