x AutoCAD and Its Applications—Basics Copyright Goodheart-Willcox Co., Inc. About the Authors About the Author s Terence M. Shumaker is Faculty Emeritus, the former Chairperson of the Drafting Technology Department, and former Director of the Autodesk Premier Training Center at Clackamas Community College in Oregon City, Oregon. Terence taught at the community college level for over 28 years. He worked as a training consultant for Autodesk, Inc., and conducted CAD program development workshops around the country. He has professional experience in surveying, civil drafting, industrial piping, and technical illustration. He is the author of Goodheart-Willcox’s Process Pipe Drafting and coauthor of the AutoCAD and Its Applications series. David A. Madsen is the president of Madsen Designs Inc. (www.madsendesigns.com). David is Faculty Emeritus and the former Chairperson of Drafting Technology and the Autodesk Premier Training Center at Clackamas Community College in Oregon City, Oregon. David was an instructor and department Chairperson at Clackamas Community College for nearly 30 years. In addition to community college experience, David was a Drafting Technology instructor at Centennial High School in Gresham, Oregon. David is a former member of the American Design Drafting Association (ADDA) Board of Directors, and was honored by the ADDA with Director Emeritus status at the annual conference in 2005. David has extensive experience in mechanical drafting, architectural design and drafting, and building construction. David holds a Master of Education degree in Vocational Administration and a Bachelor of Science degree in Industrial Education. David is the author of Geometric Dimensioning and Tolerancing and coauthor of Architectural Drafting Using AutoCAD, the AutoCAD and Its Applications series, and other textbooks in the areas of architectural drafting, mechanical drafting, engineering drafting, civil drafting, architectural print reading, and mechanical print reading. David P. Madsen is the president of Engineering Drafting & Design, Inc., and the vice president of Madsen Designs Inc. (www.madsendesigns.com). Dave provides drafting and design consultation and training for all disciplines. Dave has been a professional design drafter since 1996, and has extensive experience in a variety of drafting, design, and engineering disciplines. Dave has provided drafting and computer-aided design and drafting instruction to secondary and postsecondary learners since 1999, and has considerable curriculum, program coordination, and development experience. Dave holds a Master of Science degree in Educational Policy, Foundations, and Administrative Studies with a specialization in Postsecondary, Adult, and Continuing Education a Bachelor of Science degree in Technology Education and an Associate of Science degree in General Studies and Drafting Technology. Dave is the author of Inventor and Its Applications and coauthor of Architectural Drafting Using AutoCAD, AutoCAD and Its Applications—Basics, AutoCAD and Its Applications—Comprehensive, Geometric Dimensioning and Tolerancing, and other textbooks in the areas of archi- tectural drafting, mechanical drafting, engineering drafting, civil drafting, architec- tural print reading, and mechanical print reading. ADDA Technical Publication ADDA Technic a l Public a tion The content of this text is considered a fundamental component to the design drafting profession by the American Design Drafting Association. This publication covers topics and related material relevant to the delivery of the design drafting process. Although this publication is not conclusive, it should be considered a key reference tool in furthering the knowledge, abilities, and skills of a properly trained designer or drafter in the pursuit of a professional career.