This book assists readers in understanding geometric tolerancing symbols, interpretation, drawings and inspection methods. An accessible writing style covers GTD with step-by-step instructions, and is accompanied by clear and complete photos of setups, drawings, sketches, and detailed examples. Clear and concise chapter topics include datums, inspecting size tolerances, flatness, straightness, circularity, cylindricity, parallelism, perpendicularity, angularity, circular runout, total runout, profile of a line, profile of a surface, concentricity, position tolerances, symmetry, and an introduction to functional gage design. For product engineers, design engineers, manufacturing engineers, quality engineers, and mechanical inspectors.
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Clear descriptions and nearly 400 illustrations make Geometric Dimensioning and Tolerancing an essential reference for operators, machinists, inspectors, quality technicians and engineers, and other people in manufacturing companies who need to know about inspection methods and techniques.
Coverage of specific methods and techniques used to ensure functional inspection of the geometric tolerances included in this text has immediate value for anyone involved in the quality control process.
Formerly titled Measuring and Gaging Geometric Tolerances, the second edition has been updated and revised to reflect the latest ASME standards (ASME Y14.5M). The following changes and additions ensure that this new edition meets the needs of today's quality professionals:
A variety of publications cover the American Society for Mechanical Engineers (ASME) Y 14.SM standard Geometric Dimensioning and Tolerancing (GDT). One problem faced by those who are responsible for inspection is the fact that most of these publications cover the subject of GDT only from the point of view of the draftsperson, designer, or manufacturing engineer. There are few sources of information for the people who have to inspect the end product with respect to these tolerances. Many who understand geometric tolerances and inspection methods have learned them the hard way—through mistakes and experience. The primary purpose of this book is to provide a source of learning for specific methods and techniques that can be used to ensure functional inspection of geometric tolerances. This book is designed specifically for operators, machinists, inspectors, quality technicians and engineers, and other people in manufacturing companies who have the need to know about inspection methods and techniques.
Some assumptions were made during the preparation of this book. One is that the reader already understands how to use and care for standard inspection equipment. A variety of inspection gages and measuring instruments (such as micrometers, indicators, surface plates, right-angle plates, and precision parallels) will be used in the examples, and it is assumed that the reader knows how to use this equipment. Many available textbooks cover the fundamentals of measuring and gaging equipment if the reader should need to study these topics.
Another assumption is that the reader works with GDT on engineering drawings per the ASME Y14.SM standard. The ASME symbols are interpreted in this book to the extent necessary to understand the inspection or gaging method discussed. An introduction to each symbol and some key facts about the symbol provide the reader with the interpretation necessary to perform the inspection and to better understand the symbol and its application. There are many different applications for GDT on a wide variety of products and functional requirements. It is not possible to cover all the different combinations and applications in one text. This book does, however, cover all the geometric tolerances in the standard, a representative sample of applications, and more than one method of inspection for each symbol.
Coverage of inspection methods for each symbol will begin with a sample drawing of a part, an explanation of the geometric requirement, a review of the GDT rules and tolerance zones that apply, and, finally, step-by-step instructions and photos for the inspection or gaging method. Readers should try to consider an application of their own as they are studying the various inspection and gaging methods covered in this book. For example, the methods illustrated might cover an example using a small part that are the same methods for larger parts using larger equipment. In every case, the rules and tolerance zones for each symbol are the same as the examples indicate, except that different amounts of tolerances are often applied.
It is important to understand that all the tolerance values used in this book are examples only and do not in any way constitute standard tolerance values. Tolerances for a given design depend solely on the design requirement. All inspection methods and techniques carry with them a certain amount of inherent error. The limitations of each method will also be covered so that appreciable measurement errors can be avoided.
Another assumption is that readers will use the knowledge obtained from each application covered to help them see how the inspection could be performed with other similar instruments, keeping in mind that a wide variety of measuring machines could be used for the inspection.
Most of the parts used in this book, except those with a specific credit line, have been machined specifically for use in the book and are the property of the author. All the measuring instruments used in this book are used instruments that have been donated by various companies, or the company has allowed the author access to its equipment. Although most of the instruments are second-hand, they provide good physical examples of each measurement method covered. This second edition offers the following changes and additions:
Finally, this book has been limited by the type and amount of gages and products that have been donated for use in the examples. There are many different kinds of equipment on the market today that are more sophisticated than the equipment used in this book, but the principles of measuring geometric tolerances are well demonstrated by these traditional measuring tools and gages.
I would like to thank the following companies and individuals who provided support and equipment or products for completing this project. A special thanks goes to Garrett Automotive Products Company, Torrance, California (specifically to Andy Timko), who provided many of the measuring tools and parts that were used in this project, and to AlliedSignal Aerospace Systems & Equipment, Torrance, California (specifically to Angela Elliott and Victor Martinez), who also provided many of the measuring tools.
1 special thanks also goes to Woodruff Corporation, Torrance, California; A. H. Machine Inc., Inglewood, California; Delco Machine & Gear, Gardena, California; Barry Controls Aerospace, Burbank, California; and Ace Air Inc., Gardena, California, who provided special parts for use in the book, and to James Pluma, Corona, California; who took all the photographs of inspection setups.
I would also like to acknowledge and thank the reviewers who provided valuable feedback and helpful suggestions in preparation of this revision. Those reviewers include: Thomas G. Soyster, Eastern Michigan University and Calvin, J. Sellers, San Joe City College.
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Descripción Pearson, 2001. Paperback. Estado de conservación: New. Never used!. Nº de ref. de la librería P110130604631
Descripción Pearson, 2001. Paperback. Estado de conservación: New. Brand New!. Nº de ref. de la librería VIB0130604631