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เนื้อหาย่อ : Since the machine age began about 200 years ago with the eruption of the Indus- trial Revolution, technological progress has come with constantly accelerating speed. Like amoeba multiplying in spectacular geometric progression, each invention, each new bit of knowledge, has been the springboard for countless additional technological advancement. By now, the pace of this expanding and radiating advance has become so rapid that it seems likely we shall make as much progress in the next 20 years as we did in the last 200. One of the developments of recent years that has contributed to this explosive progress is the contour band machine. Since its introduction in 1935 it has swept into widespread use in more kinds of manufacturing applications than any other single machine tool. This is understandable because the contour band machine literally can cut any kind of material from asbestos to zinc and because it not only can turn out a finished product itself, but also can make machines that make the finished products. There is a great need in industry for skilled technicians to operate these vital band machines. There is an equally great need for better training in our schools, in plants and in government programs to supply the skilled band machinists required by industry. The purpose of this book is to provide that training. At the very outset the unique principles of band machining and the band mac hine's versatility are made clear. The emphasis is on the principal vertical and horizontal band machines used. But because the band machine r reaches into ev manufacturing proces ess, from machining the ra raw material to cutting the cartons that very facet of the package the finished product, this book also describes the techniques of operating other band machines developed for special and specific purposes so as to present a complete pleture of the band machinist's sphere of activity. Although band machines must be discussed in such a textbook as this, it is not the machine itself with which this book is primarily concerned. The objectives are complete under- standing of the various and nume erous applicatior ns of band machining in the multifarious manufacturing processes in our complex machine economy. To that end, for example, the book instructs the student in the selection and use of carbon alloy and high-speed-steel saw bands, which are used to do the lion's share of metalcutting, the main band machine application. However, special band tools have been developed to extend the band machine's productivity in cutting such materlals as glass, concrete, wood, paper, fabric, ceramic and plastic materials. So this book also includes a discussion of these band tools and their applications to provide a complete image of the band machinist's profession and to reveal the opportunities and challenges awaiting him. A band machinist is more than a machine operator with a cutting tool. He must understand cutting fluids. He must know when to use them and when not to use them. He must know the basic types and which ones to use with each material. Therefore, such subjects are covered in this book too.