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เนื้อหาย่อ : Few persons not directly connected mation is so ordered as to make each with it can imagine the importance chapter a complete unit of work. which sheet metals play in their every- This third edition incorporates the day lives. Sheet metal's numerous ad- suggestions of many instructors. It re vantages make its use desirable in flects the results of a careful analysis mahy products used in the home, of the book's use and its testing by factory, office, on the farm, and in many thousands of students. For ex- transportation of all kinds. ample, since the sheet metal workur Rolled sheet iron production dates generally works from patterns or may back to the 17th Century, but mass- , even adapt such patterns to suit par- produced steels and other metals have ticular applications, an understanding been comparatively recent develop- of the basic methods by which such ments. Much of this growth has been patterns are developed is as vitd as a the result of the introduction of meth- knowledge of the tools and machines ods by which steel and other metals used to produce a finished object from such a pattern. may be economically produced. Moreover, discoveries in the field It is equally important to put thi of metallurgy are increasing this understanding into practice and. for growth at a rapid rate. As we entered that reason, work projects in this re the Nuclear and Space Ages, the new vised edition have been increascu in metals and metal alloys developed as number and variety over previous eoi a result of the requirements of those tions. The projects are designed both technologies have still further ex- to carry through operations previousl panded the need of the sheet metal learned and to add new elements pre worker for fundamental and basic sented in each chapter. They are information. spotted throughout the text and Sheet Metal Shop Practice is sig- thereby serve as guides by which nificant in that it satisfies such needs progress and understanding may be by presenting information in such a measured. way as to progressively develop the Some of the major additions to this necessary skils required of sheet metal revised edition include new chupters workers. At the same time, this infor- on plastics and exotic metals. Fabrica