Machine Design

Books on engineering design, like designs them­ selves, are highly individual. In this one, the author emphasizes the importance of a visual approach to machine design and makes his point by including a large number of illustrations. He also stresses the need for clear objectives in all design work. Professor Leyer is an experienced designer and an inspiring teacher, and his book is based on his own lecture course in the subject. Throughout, he shows be the goal to which mathematics, mech­ design to anics and engineering drawing are the means. His book complements the usual range of engineering texts and can be read to advantage by students at any stage of their studies. In addition, he gives clear descriptive accounts of some important topics (such as stress concentration and the torsion of non­ circular sections) which are often omitted from textbooks because of their mathematical complexity. In controversial matters-the merits of the patent system, for example-Professor Leyer leaves us in no doubt as to his own views. In editing this translation I have used SI units for physical quantities and I urge readers to make their own calculations in this system whenevet they have the choice. It will be some years, however, before the familiar inch, foot and pound disappear alto­ gether and I have added the corresponding values in these units. Front Matter....Pages i-x Front Matter....Pages N1-N1 The Nature and Value of Design....Pages 1-2 Where does invention end, and design begin?....Pages 3-7 Design components....Pages 7-7 The need for a clear statement of the problem....Pages 7-8 The right amount of perseverance....Pages 8-9 Design and calculation....Pages 9-10 The art of moderation....Pages 10-14 The courage to be exceptional....Pages 14-16 Design and aesthetics....Pages 16-19 Design and skill in drawing....Pages 19-22 Standards....Pages 22-26 A brief theory of engineering surfaces....Pages 26-40 Limitations and changes in the production process....Pages 40-52 Control and self-control....Pages 53-54 Front Matter....Pages 55-55 Introduction to general form design....Pages 57-57 Elements of design....Pages 57-61 The principle of constant wall thickness....Pages 61-70 Strong and weak shapes....Pages 70-82 The phenomenon of ‘Lines of Force’....Pages 82-83 Effect of shape on loading and stresses....Pages 83-89 Front Matter....Pages 55-55 The stress-concentration index (or ‘notch sensitivity’) of materials....Pages 89-92 Designing to match the stress flow....Pages 92-102 The shaping of corners and surfaces....Pages 102-108 Designing to match fluid flow....Pages 108-112 Back Matter....Pages 113-115