Advanced study of modeling, design, integration, and best practices for use of machine elements, such as bearings, bolts, belts, flexures, and gears. Modeling and analysis is based upon rigorous application of physics, mathematics, and core mechanical engineering principles, which are reinforced via laboratory experiences and a design project in which students model, design, fabricate, and characterize a mechanical system that is relevant to a real-world application. Activities and quizzes are directly related to, and coordinated with, the project deliverables. Develops the ability to synthesize, model and fabricate a design subject to engineering constraints (e.g., cost, time, schedule). Students taking graduate version complete additional assignments. Enrollment limited.
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.
Machine Elements In Mechanical Design 5th Edition Pdf Free Download
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Machines and Mechanisms are the most common elements mechanical engineers calculate and design. In these courses, you will learn how to design machine elements in a hypothetical project we provide using Autodesk Inventor and one of its key productivity tools - Design Accelerators.
Concurrent engineering and "Design-for-X" ideas (Chapter 7). These are important in modern manufacturing practice and should be introduced in a well-rounded course in mechanical engineering design.
While generally not considered to be a machine element, the shape, texture and color of covers are an important part of a machine that provide a styling and operational interface between the mechanical components of a machine and its users.
Machine elements are basic mechanical parts and features used as the building blocks of most machines.[2] Most are standardized to common sizes, but customs are also common for specialized applications.[3]
Machine elements may be features of a part (such as screw threads or integral plain bearings) or they may be discrete parts in and of themselves such as wheels, axles, pulleys, rolling-element bearings, or gears. All of the simple machines may be described as machine elements, and many machine elements incorporate concepts of one or more simple machines. For example, a leadscrew incorporates a screw thread, which is an inclined plane wrapped around a cylinder.
Many mechanical design, invention, and engineering tasks involve a knowledge of various machine elements and an intelligent and creative combining of these elements into a component or assembly that fills a need (serves an application).
Preface The objective of this book is to provide the concepts, procedures, data, and decision analy- sis techniques necessary to design machine elements commonly found in mechanical de- vices and systems. Students completing a course of study using this book should be able to execute original designs for machine elements and integrate the elements into a system composed of several elements. This process requires a consideration of the performance requirements of an individ- ual element and ofthe interfaces between elements as they work together to form a system. For example, a gear must be designed to transmit power at a given .speed. The design must specify the number of teeth, pitch, tooth form, face width, pitch diameter, material, and method of heat treatment. But the gear design also affects, and is affected by, the mating gear, the shaft carrying the gear, and the environment in which it is to operate. Furthermore, the shaft must be supported by bearings, which must be contained in a housing. Thus, the designer should keep the complete system in mind while designing each individual ele- ment. This book will help the student approach design problems in this way. This text is designed for those interested in practical mechanical design. The empha- sis is on the use of readily available materials and processes and appropriate design ap- proaches to achieve a safe, efficient design. It is assumed that the person using the book will be the designer, that is, the person responsible for determining the configuration of a ma- chine or a part of a machine. Where practical, all design equations, data, and procedures needed to make design decisions are specified. It is expected that students using this book will have a good background in statics, strength of materials, college algebra, and trigonometry. Helpful, but not required, would be knowledge of kinematics, industrial mechanisms, dynamics, materials, and manufactur- ing processes. Among the important features of this book are the following: 1. It is designed to be used at the undergraduate level in a first course in machine design. 2. The large list of topics allows the instmctor some choice in the design of the course. The format is also appropriate for a two-course sequence and as a refer- ence for mechanical design project courses. 3. Students should be able to extend their efforts into topics not covered in classroom instmction because explanations of principles are straightforward and include many example problems. 4. The practical presentation of the material leads to feasible design decisions and is useful to practicing designers. 5. The text advocates and demonstrates use of computer spreadsheets in cases re- quiring long, laborious solution procedures. Using spreadsheets allows the de- signer to make decisions and to modify data at several points within the problem while the computer performs all computations. See Chapter 6 on columns. Chapter 9 on spur gears. Chapter 12 on shafts. Chapter 13 on shrink fits, and Chapter 19 on spring design. Other computer-aided calculation software can also be used. Ill
IV Preface 6. References to other books, standards, and technical papers assist the instructor in presenting alternate approaches or extending the depth of treatment. 7. Lists of Internet sites pertinent to topics in this book are included at the end of most chapters to assist readers in accessing additional information or data about com- mercial products. 8. In addition to the emphasis on original design of machine elements, much ofthe discussion covers commercially available machine elements and devices, since many design projects require an optimum combination of new, uniquely designed parts and purchased components. 9. For some topics the focus is on aiding the designer in selecting commercially available components, such as rolling contact bearings, flexible couplings, ball screws, electric motors, belt drives, chain drives, clutches, and brakes. 10. Computations and problem solutions use both the International System of Units (SI) and the U.S. Customary System (inch-pound-second) approximately equally. The basic reference for the usage of SI units is IEEE/ASTM-SI-10 Standard for Use ofthe Intemational System of Units (SI): The Modern Metric System, which has replaced ASTM E380 and ANSI/IEEE Standard 268-1992. 11. Extensive appendices are included along with detailed tables in many chapters to help the reader to make real design decisions, using only this text. MDESIGN- The design of machine elements inherently involves extensive procedures, complex cal- MECHANICAL culations, and many design decisions. Data must be found from numerous charts and ta- bles. Furthermore, design is typically iterative, requiring the designer to try several DESIGN options for any given element, leading to the repetition of design calculations with new SOFTWARE data or new design decisions. This is especially true for complete mechanical devices INCLUDED containing several components as the interfaces between components are considered. IN THE BOOK Changes to one component often require changes to mating elements. Use of computer- aided mechanical design software can facilitate the design process by performing many aiDESIGN ofthe tasks while leaving the major design decisions to the creativity and judgment ofthe designer or engineer. We emphasize that users of computer software must have a solid under- standing of the principles of design and stress analysis to ensure that design deci- sions are based on reliable foundations. We recommend that the software be used only after mastering a given design methodology by careful study and using man- ual techniques. Included in this book is the MDESIGN mechanical design software created by the TEDATA Company. Derived from the successful MDESIGN mec software produced for the European market, the U.S. version of MDESIGN employs standards and design meth- ods that are typically in use in North America. Many of the textual aids and design proce- dures come directly from this book. Machine Elements in Mechanical Design, Topics for which the MDESIGN software can be used as a supplement to this book include: Beam stress analysis Beam deflections Mohr's circle Columns Belt drives Chain drives Spur gears Helical gears Shafts Keys Power screws Springs Rolling contact bearings Plain surface bearings Bolted connections Fasteners Clutches Brakes
PARTI Principles of Design and Stress Analysis OBJECTIVES As you complete the first six chapters of this book, you will gain an understanding of AND CONTENT design philosophies, and you will build on earlier-learned principles of strength of ma- terials, materials science, and manufacturing processes. The competencies gained from OF PART I these chapters are useful throughout the book and in general machine design or product design projects. Chapter 1: The Nature of Mechanical Design helps you see the big picture of the process of mechanical design. Several examples are shown from different industry sectors: consuiner products, manufacturing systems, constmction equipment, agiicul- tural equipment, transportation equipment, ships, and space systems. The responsibili- ties of designers are discussed, along with an illustration of the iterative nature of the design process. Units and conversions complete the chapter. Chapter 2: Materials in Mechanical Design emphasizes the design properties of materials. Much of this chapter is probably review for you, but it is presented here to em- phasize the importance of material selection to the design process and to explain the data for materials presented in the Appendices. Chapter 3: Stress and Deformation Analysis is a review of the basic principles of stress and deflection analysis. It is essential that you understand the basic concepts summarized here before proceeding with later material. Reviewed are direct tensile, compressive, and shearing stresses; bending stresses; and torsional shear stresses. Chapter 4: Combined Stresses and Mohr's Circle is important because many general design problems and the design of machine elements covered in later chapters of the book involve combined stresses. You may have covered these topics in a course in strength of materials. Chapter 5: Design for Different Types of Loading is an in-depth discussion of design factors, fatigue, and many of the details of stress analysis as used in this book. Chapter 6: Columns discusses the long, slender, axially loaded members that tend to fail by buckling rather than by exceeding the yield, ultimate, or shear stress of the material. Special design and analysis methods are reviewed here. e24fc04721
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