Machinery's Handbook, 31st Edition
PREFACE The editors are greatly indebted to readers who call attention to possible errors and defects in the Handbook , offer suggestions for including new or revised material, or have technical questions about the content and applicability to manufacturing problems encountered in the shop. Such dialog helps identify topics that require clarification or expansion. Queries involving Handbook material usually entail an in-depth review of the topic in question, frequently resulting in improved or new material. We also welcome new contributors to each edition, joining the long line of erudite industry experts who have made the Handbook what it is today, and we invite topical experts to contact the editors. Our perpetual goal is to increase the usefulness of the Handbook as much as possible. We welcome your input and look forward to hearing from you. Acknowledgments and Special Thanks Machinery’s Handbook is indebted to the whole mechanical field for the data contained in this master reference work. On behalf of the Handbook editors past and present, we wish to express our appreciation to all who have assisted in furnishing data and contributed ideas, corrections, and other commentary on the Handbook. Most importantly, we thank the thousands of readers who have contacted us over the years with constructive criticism and suggestions regarding Handbook topics and presentation. Your comments on this edition, as well as past and future ones, are invaluable. Many of the American National Standards Institute (ANSI) standards that deal with mechanical engineering, extracts from which are included in the Handbook, are published by the American Society of Mechanical Engineers (ASME). The editors thank ASME for its exceptional collaboration in helping identify and bring essential data up to date, accord- ing to the latest, definitive, industry standards. Information concerning other standards and nomenclature also is included in the Handbook. Official standards and related publications are copyrighted by the issuing organizations; contact them directly for further information regarding current editions of standards and to purchase copies. On the following pages are brief biographies for the Machinery’s Handbook, 31st Edition team— an impressive roster of Editorial Advisory Board members and contributors. These esteemed colleagues have played a crucial role in guiding content decisions and advising on specific engineering questions and content challenges. Their lifelong educational and industry experience, impressive technical knowledge and expertise, and meticulous research have immeasurably enhanced the content of this edition. We also wish to thank those behind the scenes, our tremendous editorial and production team, without whom this edition would not be possible: the incomparable Jason Hughes, Abigail Parker, Billie Rothstein, and the rest of the remarkable team at Scribe; math maven Dan McKinney; eagle- eyed editorial team members Teresa Barensfeld, Cara Chamberlain, Gerald Murray, Julia Phelps, and Deborah Ring; and our masterful printing and binding partners at Thomson Press. In addition, longtime editor, mastermind, and retired leader of the Handbook team Christopher McCauley is recognized for his extensive additions to essential content over multiple editions. Accordingly, he has been added to the masthead of illustrious authors of the Handbook. The Handbook is indebted to many others in industry organizations and associations, educational institutions, commercial enterprises, and private practice. In this context, we cannot thank everyone who has written in, helped resolve a question, or has otherwise spent valuable time and effort assisting us improve past and present editions . Therefore, we have added a “Handbook Hall of Fame” to our website, where we can acknowledge and acclaim the most important participants in the community surrounding this legendary product. Again, we encourage you to send us your thoughts and feedback, and to share with us how the Machinery’s Handbook product family supports and enhances your involvement in this endlessly fascinating field. Laura Brengelman Editor ix
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