Engineering Design and Graphics Using Mechanical Desktop 5.0

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9780130610270: Engineering Design and Graphics Using Mechanical Desktop 5.0

Engineering Design and Graphics with Mechanical Desktop 5.0 covers the design and creation of Mechanical Desktop drawings that are compatible with ANSI standards. It incorporates the theory of drawing design and creation along with software commands. By focusing on the design and creation of drawings, users learn to work with Mechanical Desktop in a realistic environment, making the material more relevant and useful. The text also includes tips on using the Internet to gather information and design data. 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-on 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

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This book presents an introduction to the fundamentals of engineering design and uses Mechanical Desktop 5.0 to create the appropriate drawings. The first six chapters deal primarily with Mechanical Desktop. Emphasis is placed on creating a family of drawings: assembly drawings, detail drawings, and bills of material. Chapters 7 and 8 deal with dimensioning and tolerancing. It is felt that an understanding of these two subjects is critical to the development of a designer. Both subjects are extensive and complex, so they are presented in great detail.

Chapters 9, 10, and 11 cover bearings, shafts, gears, cams, spring, and keys—in short, the knowledge needed to complete basic design projects. These chapters include force analyses but place emphasis on selected components from manufacturers' catalogs and Web sites. Many Web sites are referenced. Chapter 12 presents the design process and uses an actual project as a way to demonstrate the fundamentals presented. Chapter 13 includes eight hands-on design projects for students to build and analyze.

Chapter 1 presents the 2D sketching commands and is intended for those who have no AutoCAD experience. Each command on the 2D Sketching toolbar is presented using a step-by-step format that defines how the command is used. The Grid, Snap, and Object Snap commands are also presented along with an explanation of drawing units. Readers with AutoCAD experience may want to go directly to Chapter 2.

Chapter 2 shows how to sketch using Mechanical Desktop. 2D Constraints are introduced and applied to the sketches, and the Extrude command is used to create 3D models of uniform thickness. Features are then added to the models.

Chapter 3 introduces sketch and work planes. The chapter includes several sample problems designed to show how to create slanted, offset, and perpendicular planes. Parametric editing commands are presented to show how to modify existing models.

Chapter 4 shows how to convert existing models into orthographic views. A detailed explanation of how different types of surfaces appear in orthographic views is given. The chapter ends with a discussion of sectional and auxiliary views.

Chapter 5 introduces the Scene commands and shows how to create assembly drawings given a group of existing individual models. The commands on the 3D Constraints toolbar are demonstrated. The chapter also shows how to create exploded isometric drawings from scenes and how to create and edit a bill of materials.

Chapter 6 presents threads and fasteners and includes material from Mechanical Desktop's Power Pack. Thread terminology and drawing callouts as well as thread representations are defined. The chapter includes a detailed explanation of how to select and size threads for both internal and external applications. Nuts and washers are included, as are examples of fasteners inserted into counterbored and countersunk holes. There are two detailed sample problems that follow the selection process for threads and fasteners from start to finish, including a final exploded isometric drawing and a bill of materials.

Chapter 7 is a very detailed presentation of the terminology and conventions for dimensioning drawings as presented in ANSI Y32. There are many examples of how to dimension different shapes.

Chapter 8 is the longest chapter in the book and deals with tolerancing, including geometric tolerancing. The chapter starts with an explanation of different tolerancing methods and progresses through fits and geometric positional tolerances. There are seven sample problems that present different conditions and show how to determine the appropriate tolerances. There is a great emphasis on making parts fit together and on understanding the effects of one tolerance on another. Virtual condition, fixed and floating fasteners, and sample design problems are included.

Chapter 9 shows how to select and size sleeve bearings and ball bearings. Load bearing capabilities and speed limits are discussed and used to determine a shaft's diameter. A sample problem starts with a load and speed requirement and shows how to determine the loads acting on the shaft and how to select the appropriate shaft size and bearings. Bearing selection is made using manufacturers' catalogs and Web sites.

Chapter 10 covers gears. Gear ratios, terminology, forces in gears, and the Lewis equation are presented along with wear, shock, safety, and speed factors. The chapter shows how to select gears from manufacturers' catalogs and Web sites. The chapter includes a sample problem that shows the design of a speed-reducing gear box.

Chapter 11 presents cams, springs, and keys. Displacement diagrams are presented, and an example is given showing how to convert the information on the displacement diagram to a 3D cam shape. The design of springs is done by referencing several Web sites and giving examples as to how they are used. Key and keyseats are presented along with examples of their application.

Chapter 12 explains the design process. The chapter uses a specific project, The String Climber, to illustrate how the design process works and is managed. Topics include concept sketches, evaluation matrices, scheduling, a linear responsibility chart, a Gantt chart, required calculations, procurement, and preparation of a set of drawings that document the design. The example includes actual test data that can be used by students to develop their own string climber.

Chapter 13 contains eight design projects suitable for class use. They require no special manufacturing equipment, tools, or environment. All the materials required are easily available. The projects are intended to pull together all the drawing and analysis material presented in the book and show how it can be applied to a real-life problem.

Acknowledgement is due to the reviewers of this text: Louis A. Moegenburg, Wisconsin Indianhead Technical College; and David A. Steinhauer, Tidewater Community College (VA). Thanks to Debbie Yarnell and Michelle Churma for their help in editing and producing this book. Continued thanks to David, Maria, Randy, Lisa, Hannah, Wil, Madison, and Jack. A special thanks to Cheryl.

James D. Bethune
Boston University

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