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Jig and Fixture Design Treatise
Jig and Fixture Design; a treatise covering the principles of jig and fixture design, the important constructional details, and many different types of work-holding devices used in interchangeable manufacture;"
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The development of machine tools has been accompanied by a corresponding development of auxiliary equipment for increasing the quantity and improving the quality of the products of these machines. Whenever duplicate parts require some operation such as drilling, planing, or milling, the selection of a suitable type of machine is often followed by the design of whatever special tools or attachments are needed to adapt the machine to the operation required. The tool-guiding and work-holding jigs and fixtures which are now used in practically all machine shops represent the most important class of special equipment, and this book deals exclusively with their design and construction.
As most jigs are used for drilling operations, a book was previously published entitled "Drilling Practice and Jig Design," covering different types of drilling machines and their use, the design of drill jigs, and, to some extent, the design of fixtures such, for example, as are used on nulling machines. While the subjects of drilling and jig design are closely allied, it is no longer possible to cover them both in a single voliune, owing to the extensive changes in drilling practice and the increasing use of jigs and fixtures of various types on different classes of machine tools. Therefore, the book referred to has been replaced by two volumes, of which this is one. The other book, "Modem Drilling Practice," is already well known to many designers, shop foremen, and machinists interested in the latest types of drilling machines and their use.
This new book, "Jig and Fixture Design," contains that part of the volume on "Drilling Practice and Jig Design" which dealt with jigs and fixtures. This material was used because it is a treatise on the principles of jig and fixture design which contains information that is indispensable in a book of this kind. These original chapters which explain the general pro cedure in designing jigs and fixtures and how work should be located, clamped, etc., have been supplemented by a large amount of new matter, thus making the present book unusually complete. A great variety of jig and fixture designs have been described and illustrated in order to show just how the principles and important details referred to in the forepart of the book are applied imder many different conditions and to jigs and fixtures used on various types of machine took.
Most of the designs illustrated in this book have been sent to Machinery from men in the machine-building field, be cause the designs were considered xmusual and worth placing on record. While it would not be possible to give credit to each individual contributor, we are indebted to all who have assisted indirectly in preparing this treatise, and especially to Einar Morin and Albert A. Dowd, recognized tool experts and production engineers, who have supplied valuable material for several of the chapters on jig design.
Chapter I: PRINCIPLES OF JIG DESIGN
Chapter II: DESIGN OF OPEN DRILL JIGS
Chapter III: DESIGN OF CLOSED OR BOX JIG
Chapter IV: JIG BUSHlNGS
Chapter V: LOCATING POINTS AND ADJUST ABLE STOPS
Chapter VI: JIG CLAMPING DEVICES
Chapter VII: EXAMPLES OF DRILL JIG DESIGN
Chapter VIII: BORING JIGS
Chapter IX: MILLING AND PLANING FIXTURES
Chapter X: ADJUSTABLE FIXTURES FOR TURRET LATHES AND VERTICAL BORING MILLS
Chapter XI: THE FLOATING PRINCIPLE AS APPLIED TO FIXTURE WORK
Chapter XII: APPLICATION OF THE THREE-POINT PRINCIPLE IN FIXTURES
Chapter XIII: SPECIAL JIG AND FIXTURE MECHANISMS
Chapter XIV: PROVIDING FOR UPKEEP IN DESIGNING JIGS AND FIXTURES