Thursday, April 19, 2018

CAM DESIGN HANDBOOK By Harold A. Rothbart Editor

CAM DESIGN HANDBOOK By Harold A. Rothbart Editor
CONTENTS
Chapter 1. Introduction
Chapter 2. Basic Curves
Chapter 3. Modified Cam Curves
Chapter 4. Polynomial and Fourier Series Cam Curves
Chapter 5. Cam Motion Synthesis Using Spline Functions
Chapter 6. Elements of Cam Profile Geometry
Chapter 7. Geometry of Planer Cam Profiles
Chapter 8. Cam Mechanism Forces
Chapter 9. Cam Materials and Lubrication
Chapter 10. Cam Manufacturing
Chapter 11. Cam System Modeling
Chapter 12. Cam System Dynamics—Analysis
Chapter 13. Cam System Dynamics—Response
Chapter 14. Special Cam Mechanisms
Chapter 15. Cams in Microelectromechanical Systems
Chapter 16. Automotive Camshaft Dynamics
PREFACE
A cam is a versatile, specially shaped part of a machine that is always in contact with a member called the follower. The name cam should not be confused with the common abbreviation cam for camera or camcorder, both used in the fields of photography and video, nor with the acronym CAM applied to computer-aided manufacturing, which uti lizes computational facilities for machinery fabrication of all kinds. The book is written for the designer concerned with creating or inventing a physical or mathematical function, a motion or an action, a mechanism or a machine. It would be valuable to the mechanical engineer, electrical engineer, physicist, and scientist aimed at developing cam-follower systems of all kinds, sizes, and speeds. In addition, shop machinists and toolmakers who make and assemble the machinery will find this book of value in their work. Automobile and racing car enthusiasts should find this book helpful in their aspirations. Last, the book can be an aid to students in engineering by introducing theoretical and practical applications of multifaceted ingenious mechanisms and machinery. Cam design is constantly evolving. New techniques and information are available for cam synthesis, analysis, dynamics, and performance and the production of the actual cam body itself. The most significant advancement of cam systems has resulted from the application of the digital computer. Computer-aided design (CAD) and computer-aided manufacturing (CAM) have been invaluably applied as software tools. CAD design is downloaded to CAM in discrete increments by computer numerical control (CNC) for actual cam production
Furthermore, this book contains the latest, most important techniques and test data available. The philosophy of the book is to present diversified applications for cams to aid the reader’s understanding and design selection. This volume also contains many new examples, a listing of computer software, and an extensive list of references. It should be noted that cams, gearing, rolling-element bearings, and traction (friction) drives are of the same basic mechanical family, the study of which is generically referredto as contact mechanics. These devices have in common rolling and/or sliding actioncoupled with reasonably high concentrated contact (Hertz) stresses. In the field of contact mechanics the failure mechanisms among these machine elements are similar and are
related to material metallurgy and heat treatment, lubricant rheology and chemistry, surface topography and geometry, and applied contact load (stress). These machine components also have commonly related manufacturing requirements. Hence, they share a similar manufacturing technology and engineering analysis. The significance of cam profile accuracy is emphasized. A surface may appear smooth to the eye and yet have poor dynamic properties. Depending on the application and loads the cam profile accuracy and its surface finish may affect the life, vibration, and noise of a cam-follower system. Poor manufacturing techniques can impede the functional ability of a mechanism or machine. Also, the choice of a lubricant and the lubrication system is
pertinent on all designs.We express our respect for the inventors, designers, engineers, scientists, toolmakers, and machinists who produced cam systems in the past. Our knowledge and experience are a result of the amazing contributions and successful machines these experts handed down over the years that they toiled. This evidence of their work is our fortunate heritage. We
are surrounded with evidence of the high-quality performance of these machines, which
was accomplished with less mathematical guidance, poor manufacturing facilities, and
crude measurement tools. All the while, nature revealed her secrets, very slowly, bit by
bit. It is to be noted that the Chinese exercise for health and combat, T’ai Chi Ch’uan, has
a ritual that spiritually parallels the foregoing thought. The training performance classes
conclude with the loud clapping of hands, which is speculated to be in deference to all
those who went before.
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