Engineering Graphics with AutoCAD 2002

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From the Back Cover
Engineering Graphics with AutoCAD® 2002 presents the standards and conventions of technical drawing that are in line with national standards and uses AutoCAD® 2002 to apply these standards. Throughout the text, AutoCAD® 2002 is the exclusive tool for presenting and applying these concepts (only Chapter 4 includes coverage of pencil and paper applications).

The text begins with coverage of basic line drawing commands and progresses through more complex commands, ending with 3-dimensional and solid modeling. It also includes a solid modeling approach to descriptive geometry, with discussions on the true lengths of lines and shapes of planes, point and plane locations, and properties between lines and planes.

Other features of this text include:

• A step-by-step format for presenting software commands
• Numerous illustrations and screen captures to highlight important information
• Hands-tin projects and exercises that allow users to practice, master, and apply the concepts presented in the text
• Solved exercises that reinforce the information covered in the chapter
• A CD of several 3-dimensional drawings referenced in the book is included with this text.

Excerpt. © Reprinted by permission. All rights reserved.
This book teaches technical drawing and uses AutoCAD® as its drawing instrument. This book, an update of Engineering Graphics with AutoCAD 2000, for AutoCAD® 2002, follows the general format of many technical drawing texts and presents much of the same material about drawing conventions and practices, with emphasis on creating accurate, clear drawings. For example, the book shows how to locate dimensions on a drawing so that they completely define the object in accordance with current national standards, but the presentation centers on the Dimension toolbar and its associated tools and options. The standards and conventions are presented and their applications are shown using AutoCAD 2002. This integrated teaching concept is followed throughout the book.

Most chapters include design problems. The problems are varied in scope and are open-ended, which means that there are several correct solutions. This is intended to encourage student creativity and increase their problem-solving abilities.

Chapters 1 through 3 cover AutoCAD's Draw and Modify toolbars and other commands needed to set up and start drawings. The text starts with simple Line commands and proceeds through geometric constructions. The final sections of Chapter 3 describe how to bisect a line and how to draw a hyperbola, a parabola, a helix, and an ogee curve. These constructions are included in most on-the-board technical drawing books because they help students develop accuracy and an understanding of how to use their equipment. The same type of learning experience also occurs when the constructions are done using AutoCAD. Redrawing many of the classic geometric shapes will help students learn how to use the Draw and Modify toolbars, along with other associated commands, with accuracy and creativity.

Chapter 4 presents freehand sketching. Simply stated, there is still an important place for sketching in technical drawing. Many design ideas start as freehand sketches and are then developed on the computer. This chapter now includes extensive exercise problems associated with object orientation.

Chapter 5 presents orthographic views. Students are shown how to draw three views of an object using AutoCAD. The discussion includes projection theory, hidden links, compound lines, oblique surfaces, rounded surfaces, holes, irregular surfaces, castings, and thin-walled objects. The chapter ends with several intersection problems. These problems serve as a good way to pull together orthographic views and projection theory.

Chapter 6 presents sectional views and introduces the Hatch command. The chapter includes multiple, broken-out, and partial sectional views and how to draw an S-break for a hollow cylinder.

Chapter 7 covers auxiliary views and shows how to use the Snap, Rotate command to create axes aligned with slanted surfaces. Secondary auxiliary views are also discussed. Solid modeling greatly simplifies how to determine the true shape of a line or plane, but a few examples of secondary auxiliary views help students refine their understanding of orthographic views and eventually the application of UCSs.

Chapter 8 shows how to dimension both two-dimensional shapes and orthographic views. The Dimension command and its associated commands are demonstrated, including how to use the Dimension Styles tool. The commands are presented as needed to create required dimensions. The conventions demonstrated are in compliance with ANSI Y32.

Chapter 9 introduces tolerances. First, the chapter shows how to draw dimensions and tolerances using the Dimension and Tolerance commands, among others. The chapter ends with an explanation of fits and shows how to use the tables included in the appendix to determine the maximum and minimum tolerances for matching holes and shafts.

Chapter 10 continues the discussion of tolerancing using geometric tolerances and explains how AutoCAD® 2002 can be used to create geometric tolerance symbols directly from dialog boxes. Both profile and positional tolerances are explained. The overall intent of the chapter is to teach students how to make parts fit together. Fixed and floating fastener applications are discussed, and design examples are given for both conditions.

Chapter 11 covers how to draw and design using standard fasteners,- including bolts, nuts, machine screws, washers, hexagon heads, square heads, setscrews, rivets, and springs. Students are shown how to create wblocks of the individual thread representations and how to use them for different size requirements.

Chapter 12 discusses assembly drawings, detail drawings, and parts lists. Instructions for drawing title blocks, tolerance blocks, release blocks, and revision blocks, and for inserting drawing notes are also included to give students better preparation for industrial practices.

Chapter 13 presents gears, cams, and bearings. The intent of the chapter is to teach how to design using gears selected from a manufacturer's catalog. The chapter shows how to select bearings to support gear shafts and how to tolerance holes in support plates to maintain the desired center distances of meshing gears. The chapter also shows how to create a displacement diagram and then draw the appropriate cam profile.

Chapter 14 introduces AutoCAD®'s 3-D capabilities. It teaches students about AutoCAD®'s 3-D commands and coordinate system definition before introducing them to surface and solid models. Both WCS and UCS are explained and demonstrated along with Preset and View commands. 3-D primitives are introduced and used to create simple shapes. The chapter concludes by showing how to create orthographic views from the drawn 3-D shapes.

Chapter 15 extends the discussion of Chapter 14 to cover surface modeling. The basic geometric shapes of the Surfaces toolbar are presented as well as the Revsurf, Tabsurf, Rulesurf, 3D Face, and 3D Mesh commands. All the surface commands are demonstrated and used to create 3-D shapes.

Chapter 16 introduces solid modeling and includes the Solids Editing commands. The Solid and Solids Editing toolbars are demonstrated and used with the Union and Subtract commands to create 3-D shapes. Orthographic views are then created from the solid shapes. More complex shapes are created using the Extrude, Section, and Slice commands. The chapter concludes with several exercise problems that demonstrate a solid modeling approach to intersection problems as originally introduced at the end of Chapter 5. The chapter also includes several design exercise problems.

Chapter 17 presents a solid modeling approach to descriptive geometry. For example, a plane is drawn as a solid that is 0.00001 thick. AutoCAD®'s solid modeling and other commands are then used to manipulate the plane. The true lengths of lines and shapes of planes, point and plane locations, and properties between lines and planes are discussed. Piercing points and line visibility are also covered.

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