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(NOTE: Each chapter begins with Objectives and concludes with Command Summary and Exercises.)
Getting Started with Mechanical Desktop.
This tutorial guide provides a step-by-step introduction to the 3D modeling process and Mechanical Desktop 5, a powerful parametric 3D modeler for desktop computers. Novice modelers, as well as those who have experience with AutoCAD or another 2D CAD program, will experience the power of Mechanical Desktop as they complete parts, as3emblies, and drawings for two complete projects. Early tutorials get students started quickly with basic part modeling and drawing creation, then reinforce these Basics as students progress with more advanced modeling activities that introduce part modification, assembly modeling, working drawings, intelligent models using design variables, and using the model for visualization and analysis. Optional sections also introduce the use of Mechanical Desktop 5's Power Pack features for standard parts.
Written for independent student use in the lab portion of a beginning engineering graphics course or in an introductory 3D modeling course, this guide's learn-by-doing approach will be useful to anyone who wants to get started using Mechanical Desktop 5 in the context of the modeling tasks encountered in engineering design.
Using a tutorial approach developed and refined for teaching AutoCAD, this manual guides students through the creation and assembly of two complete projects as they follow step-by-step instructions to learn commands and techniques. As students progress,individual steps for common actions are no longer provided, so students can apply what they have learned by completing sequences on their own. Each tutorial activity encourages students to relate the commands and techniques they are learning to the modeling process. Information about Mechanical Desktop is presented in a need-to-know fashion that makes it easy to remember. Tips and shortcuts are included where appropriate to help students become efficient and proficient Mechanical Desktop users. Help Reference boxes identify and locate topics in Mechanical Desktop's on-line Help where students can find more information for fixture projects. A Command Summary makes it easy to review and use the tutorials as a reference. Each tutorial concludes with exercises that allow students the opportunity to practice their skills with interesting and realistic models.
Tutorials 1 through 3 introduce students to the basic components of parametric modeling: parts, assemblies, and drawings. Students become familiar with the 3D environment, tools for visualization, the basic sketching and modeling process, and making and printing a drawing as they complete the first part of the jack assembly.
Tutorials 4 through 8 broaden this introduction with more techniques for modeling parts, assembling parts in an assembly, and creating drawings to document the assembly. Students learn more about sketching techniques and drawing aids, create revolved parts, pattern features, and placed features, and learn how to investigate and modify models created by someone else. By Tutorial 7, all of the parts for the jack have been modeled so students can use them to as they learn to apply assembly constraints. After completing the assembly, student prepare an exploded view, examine mass properties of the assembly, and learn to document their assembly by preparing working drawings of the jack assembly and one of the parts. Students learn to create a parts fists and section view, how to add a raster image to their drawing, and good dimensioning practice.
In Tutorials 9 and 10, students create a second assembly and use techniques for making intelligent parts and assemblies, and for getting information from the model. As they model the stock cart, students learn to make swept and shelled features, work with subassemblies, use equations in dimensions, and use design variables to create configurations of table-driven parts.
The instructions in this guide assume the student will be using Mechanical Desktop 5 for Windows® 98/2000 or NT. Mechanical Desktop 5 with Power Pack is used in Tutorials 7 and 8, but these sections are optional and the tutorials can be completed without Power Pack. Any configuration instructions are written for students using Mechanical Desktop in a computer lab setting as well as for those working at home or work.
Data files for the tutorials—and related information about the text—may be found at www.prenhall.com/lockhart.
For students of introductory engineering graphics, reference boxes throughout this guide point to more information about modeling and design practice in Engineering Design Communication, a companion text that provides a broad introduction to graphics for engineering design, also available from Prentice Hall. These references are designed to link the modeling exercises in this manual to the graphics concepts covered in the text, but are not required for completion of the tutorials.
Prentice Hall offers discounts when you purchase this book with several other Prentice Hall textbooks. Discounts range from 10-20% off the price of two books separately. To request more specific pricing information, get isbn's for ordering bundles, and learn more about Prentice Hall's offerings in graphics or CAD, either contact your Prentice Hall sales rep, go to http://www.prenhall.com/ and choose AutoCad/ Engineering Graphics/Drafting, or email engineeringCprenhall.com. For the name and number of your sales representative, please contact Prentice Hall Faculty Services at 1-800-526-0485.
We would like to thank Mark Perkins for working with us to fine-tune and illustrate 1is guide and for the many excellent exercises he prepared and modeled. We would so like to acknowledge the many hundreds of engineering students at Montana State University, whose enthusiasm for 3D modeling inspired us and whose desire to "get to the modeling" helped us balance the explanations with the hands-on activities in this aide.
We would like to thank the folks at Autodesk, especially Denis Cadu, for assistance with the software. In addition we would like to thank the individuals involved in getting the book in print: Eric Svendsen, Rose Kernan, and many others.
We welcome your comments and encourage you to contact us with your suggestions >r fixture releases of this guide.
Shawna D. Lockhart
Cindy M. Johnson