Geometry of Design

Nam-Ho Kim, Ashok Kumar Das, Harold F. Snider, Ashok Kumar

• Publisher: Woodhead Publishing
• Year: 2014
• Print ISBN: 9781782421733
• eBook ISBN: 9781782421740
• Topic: Tecnologia e ingegneria
• Subtopic: Ingegneria civile

Engineering drawing is the "instrument of communication" upon which the designer must place all information necessary to define a new product. Computer-aided design (CAD) courses often involve teaching solid modelling software, and we view CAD as an engineering communication tool for manufacturing. As the technology of engineering design is in transition from paper drawings to solid models, its education must address the challenge of covering both technologies. Geometry of design integrates drafting technology based on experience with engineering design education. This workbook has evolved from the course "Computer-Aided Graphics and Design at the University of Florida, and many pages of this textbook can be used for student assignments. In order to help students to familiarize themselves with the manufacturing field experience, most assignments are to be submitted in the form of complete working drawings of the parts and assembly. The first three chapters introduce basic engineering drawing definitions and practices. The following four chapters cover design and descriptive geometry, and subsequent chapters move on to dimensions, assembly line design and surface development.

Chapter 1

Basic Engineering Drawing Definitions and Practices

A1.0a Introduction

The course material contained in this workbook is designed to be taught over a 13-week period of time. Assignments are numbered in alpha-numeric order. For example, A1.1 is the first assignment relating to hand-sketched drawings…A1.1a, A1.1b, etc. are pages of instruction relating to A1.1; C1.1 is the first assignment relating to solid modeling…C1.1a is the first page of instruction relating to C1.1, etc. Sketching assignments in week 13 are numbered A13.1, A13.2, etc. Solid modeling assignments in week 13 are numbered C13.1 C13.2, etc.

Chapter 1 contains very basic engineering drawing definitions and practices. This material reviews, refreshes and expands on topics that many freshman college students have already taken in high school or community colleges. This review assures that all students have a common base in graphics so that we can quickly move into more advanced geometric topics required to model 3-dimensional objects.

The final product of the engineering design process is a 2-dimensional engineering drawing. This becomes the “instrument of communication” between the designer and all members of a manufacturing facility. All of the geometric information required to make the object function must be properly displayed on this 2-dimensional hard copy drawing or on a 2-dimensional computer screen. All assignments in this workbook are supposed to be submitted in the form of 2-dimensional drawings.

In order to represent 3-dimensional parts in 2-dimensional drawings, pictorials are often included in the drawing so that engineers can understand the complicated 3-dimensional part better. Pictorials are different from camera images. In the oblique view, for example, receding axes are drawn at a different angle. In pictorials it is important to understand which lines are in the true length and which shapes are in the true shape. In assignments A1.2 and A1.3, students will practice isometric and oblique sketches.

Technical drawings are communication tools. Thus, all information in the drawings must be accurate and clear. Students are expected to understand the basic rules of technical drawings, such as how to distinguish a visible line from a hidden o...

Table of contents

• Cover image
• Title page
• Table of Contents
• Copyright page
• Preface
• Chapter 1: Basic Engineering Drawing Definitions and Practices
• Chapter 2: Views Perspective and Sectional
• Chapter 3: Geometric Construction
• Chapter 4: 3-View Projection System Drawing: Design Intent
• Chapter 5: Descriptive Geometry 1
• Chapter 6: Descriptive Geometry 2
• Chapter 7: Descriptive Geometry 3
• Chapter 8: Parallelism and Perpendicularity
• Chapter 9: Mutual Perpendicular: Assembly End Clearance
• Chapter 10: Dimensioning and Tolerances: Assemblies
• Chapter 11: Assembly Line Design
• Chapter 12: Threads and Fasteners
• Chapter 13: Surface Development