Machine Elements in Mechanical Design – Robert L. Mott – 4th Edition

Machine Elements in Mechanical Design – Robert L. Mott – 4th Edition

Using the most up-to-date information, this book provides a practical approach to designing machine elements in the context of complete mechanical design.

Covering some of the primary machine elements such as belt drives, chain drives, gears, shafts, keys, couplings, seals, and rolling contact bearings. It also covers plain surface bearings, linear motion elements, fasteners, springs, machine frames, bolted connections, welded joints, electric motors, controls, clutches, and brakes.

This book is for any individual design professional for which a practical approach to mechanical design, based on sound engineering principles, is desired.

FEATURES OF THE FOURTH EDITION

The practical approach to designing machine elements in the context of complete mechanical designs is retained and refined in this edition. An extensive amount of updating has been accomplished through the inclusion of new photographs of commercially available machine components, new design data for some elements, new or revised standards, new end-of-chapter references, listings of Internet sites, and some completely new elements.

The following list summarizes the primary features and the updates.

1. The three-part structure that was introduced in the third edition has been maintained.

2.

• Part I (Chapters 1-6) focuses on reviewing and upgrading readers’ understanding of design philosophies, the principles of strength of materials, the design properties of materials, combined stresses, design for different types of loading, and the analysis and design of columns.
• Part II (Chapters 7-15) is organized around the concept of the design of a complete power transmission system, covering some of the primary machine elements such as belt drives, chain drives, gears, shafts, keys, couplings, seals, and rolling contact bearings. These topics are tied together to emphasize both their interrelationships and their unique characteristics. Chapter 15, Completion of the Design of a Power Transmission, is a guide through detailed design decisions such as the overall layout, detail drawings, tolerances, and fits.
• Part III (Chapters 16-22) presents methods of analysis and design of several important machine elements that were not pertinent to the design of a power transmission. These chapters can be covered in any order or can be used as reference material for general design projects. Covered here are plain surface bearings, linear motion elements, fasteners, springs, machine frames, bolted connections, welded joints, electric motors, controls, clutches, and brakes.

3. The Big Picture, You Are the Designer, and Objectives features introduced in earlier editions are maintained and refined. Feedback about these features from users, both students and instructors, has been enthusiastically favorable. They help readers to draw on their own experiences and to appreciate what competencies they will acquire from the study of each chapter. Constructivist theories of learning espouse this approach.

4. Some of the new or updated topics from individual chapters are summarized here.

5.

• In Chapter 1, the discussion of the mechanical design process is refined, and several new photographs are added. Internet sites for general mechanical design are included that are applicable to many later chapters. Some are for standards organizations, stress analysis software, and searchable databases for a wide variety of technical products and services.
• Chapter 2, Materials in Mechanical Design, is refined, notably through added material on creep, austempered ductile iron (ADI), toughness, impact energy, and the special considerations for selecting plastics. An entirely new section on materials selection has been added. The extensive list of Internet sites provides readers access to industry data for virtually all types of materials discussed in the chapter with some tied to new practice problems.
• Chapter 3, a review of Stress and Deformation Analysis, has an added review of force analysis and refinement of the concepts of stress elements, combined normal stresses, and beams with concentrated bending moments.
• Chapter 5, Design for Different Types of Loading, is extensively upgraded and refined in the topics of endurance strength, design philosophy, design factors, predictions of failure, an overview of statistical approaches to design, finite life, and damage accumulation. The recommended approach to fatigue design has been changed from the Soderberg criterion to the Goodman method. The modified Mohr method is added for members made from brittle materials.
• In Chapter 7, synchronous belt drives are added and new design data for chain power ratings are included.
• Chapter 9, Spur Gear Design, is refined with new photographs of gear production machinery, new AGMA standards for gear quality, new discussion of functional measurement of gear quality, enhanced description of the geometry factor 1 for pitting resistance, more gear lubrication information, and a greatly expanded section on plastics gearing.
• In Chapter 11, new information is provided for keyless hub to shaft connections of the Ringfeder® and polygon types, and the Cornay™ universal joint. The extensive listing of Internet sites provides access to data for keys, couplings, universal joints, and seals.
• Critical speeds, other dynamic considerations, and flexible shafts are added to Chapter 12, Shaft Design.
• An all-new section, Tribology: Friction, Lubrication, and Wear, is added to Chapter 16, Plain Surface Bearings. More data on pV factors for boundary lubricated bearings are provided.
• Chapter 17 has been retitled Linear Motion Elements and includes power screws, ball screws, and linear actuators.
• Refinements to Chapter 18, Fasteners, include the shear strength of threads, components of torque applied to a fastener, and methods of bolt tightening.