Copyrights COPYRIGHTDEPOSIT V y Sheet Metal Workers' Manual A Complete, Practical Instruction Book on the Sheet Metal Industry, Machinery and Tools, and Related Subjects, Including the Oxy-AcetyleneWelding and k Cutting Process By BROEMEL L. With a Special Course in Elementary and Advanced Sheet Metal Work and Pattern Drafting for Technical and Trade School Instructors and Students;Alsofor Referenceand Study by Sheet Metal Workers and Apprentices By DAUGHERTY J. S. Instructor in Sheet Metal Work, School of Applied Industries, Carnegie Institute of Technology, Pittsburgh FULLY ILLUSTRATED CHICAGO FREDERICK DRAKE & CO. J. Publishers Copyright 1918 BY Frederick J. Drake & Co. / M 10 1918 ©CLA499641 PREFACE This book has been written in response to a widespread demand for a comprehensive work on the machinery, tools, and methods employed in sheet metal working. This demand comes from the trade, as well as from manual-training and technical schools. Realizing the need for a correlated course in practical sheet metal and pattern drafting in text form, Professor J. S. Daugherty, Instructor in Sheet Metal Work in the School of Applied Industries, Carnegie Institute of Tech- nology, Pittsburgh, Pa., has rendered valuable assistance by the preparation of such a course, with pen drawings and illustrations of actual problems, along the lines of the best shop methods, derived from years of experience in teaching the subject and as a practical sheet metal worker. The course is outlined and the problems are pre- sented in such sequence that the processes and machine operations are reviewed with each new problem. It is not expected that all the problems given by Pro- fessor Daugherty will be strictly copied, but rather that they will make clear the methods and processes that may be applied in the construction of similar problems in actual practice. The proper sequence, so necessary for successful instruction in sheet metal pattern drafting, is an important feature of this course. Many of the prob- lems are only partly solved, which prevents the student from copying from the text and compels him to develop his power to think as well as to draw. It is desired that this course may be regarded as presenting the essentials of sheet metal work, rather than as an attempt to produce a series of models. 5 6 PREFACE After a perusal of the correlated course in sheet metal working and pattern drafting, attention may well be directed to the chapters in this book on Oxy-Acetylene Welding and Cutting, Electric Welding, Hand Forging and Welding, and other information that does not directly deal with sheet metal work and pattern drafting, tut includes subjects intimately connected with sheet metal working practice. These subjects are having exten- sive introduction in the modern sheet metal shop. Schools teaching sheet metal working as an industrial art should therefore in the preparation of their courses, arrange for lectures that will convey to the mind of the student that there are other methods for joining together sheet metals besides riveting and soldering. Any one school term does not permit extensive practice of these processes, but the student should know something about them, to qualify him for a place abreast of his fellow-work- men on establishing himself in the industrial shop. If the time for lectures on these subjects is not afforded, it can be suggested that the student read up on the same. The principal author of this book has been for many years active with The Peck, Stow & Wilcox Co., of South- ington, Conn., foremost manufacturers of sheet metal working machinery. He presents a collection of data on the construction and application of modern sheet metal working machines and tools, describing their purposes and uses with pen drawings and other illustrations in as practical and non-technical a manner as possible, making the instruction given easy to follow. During eighteen years of service with the manufacturers named, he has gained a broad experience in sheet metal working machin- ery development, and offers here a source of information of great value to all those interested in sheet metal work, and the labor and time saving equipment so necessary for bringing to a finished stage of completion the many