The new metal worker pattern book

THE NEW METAL WORKER PATTERN BOOK

A treatise on the principles and practice of pattern cutting as applied to sheet metal work.

BY W. KITTREDGE.

NEW YORK: DAVID WILLIAMS, 1896.
    

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The new metal worker pattern book
    

CONTENTS

-    Terms and Definitions
-    Alphabetical List of Terms
-    Drawing Instruments and Materials
-    Linear Drawing
-    Geometrical Problems
-    Construction of Regular Polygons
-    The Ellipse
-    The Volute
-    Principles of Pattern Cutting
-    Parallel Forms
-    Regular Tapering Forms
-    Irregular Forms

Pattern Problems
SECTION 1. - Parallel Forms (Miter Cutting)
SECTION 2. - Regular Tapering Forms (Flaring Work)
SECTION 3. - Irregular Forms (Triangulation)


INTRODUCTION

FOR the benefit of those who may contemplate making use of this work, wholly or in part, it is well to lay before them at the outset a general statement of the plan upon which it is written, together with some advice for the use and study of the same, which may not properly belong under any of the several headings comprising the subject matter. A glance at the table of contents immediately preceding will give at once a clear idea of its scope and arrangement. From this it will be seen that the first five chapters arc theoretical or educational in their nature, while the last chapter is devoted to practical work ; and further, that the book does not presume upon any previous technical knowledge upon the part of the beginner, but aims to place before him in the preliminary chapters all that is necessary to a thorough understanding of the work performed in the last chapter, which constitutes the bulk of the book.

A very important feature of the work is the classification of the problems. The forms for which patterns may be required are divided, according to the methods employed in developing their surfaces, into three classes, and the problems relating to each are arranged in three corresponding sections of the last chapter, thus bringing near together those in which principles and methods are alike. In Chapter V (Principles of Pattern Cutting) this classification is defined and the principles governing each class are explained and illustrated under three sub-headings of the chapter. The third subdivision treats of the method of developing the surfaces of irregular forms by Triangulation a subject not heretofore systematically treated in any work on pattern cutting.

A chapter on drawing (Chapter III) has been prepared for the benefit of the pattern cutter especially interested in cornice work, and though he may not intend to become a finished architectural draftsman, this chapter will render him valuable assistance in reading the original drawings received from architects, from which he is required in many cases to make new drawings adapted to his own peculiar wants.

The New Metal Worker Pattern Book, besides being a systematic treatise on the principles of pattern cutting, is also valuable as a reference book of pattern problems and as a fund of information on the subject treated, to be drawn from at convenience, and is so written that each problem, or chapter of descriptive matter, can be read independently of the others; so that the student whose time is limited can turn to any portion of the work the title of which promises the information sought, without feeling that he must read all that precedes it. The relative importance of the chapters depends, of course, upon the individual reader, and will be determined by what he considers his weakest points. However, it is advisable in the study of all works of a scientific nature to begin at the beginning and take everything in its course. If, therefore, the study of this work can be continued progressively from the first, much advantage will be gained.

The statement of each problem in prominent type appears at the head of the demonstration, and every problem is numbered, by which arrangement the problems are well separated from each other and easily found.

While each demonstration is considered complete in itself, some are necessarily carried farther into detail than others, and references are made from one problem to another, pointing out similarity of principle, where such comparison would be advantageous to one who is looking for principles rather than for individual solutions.

In preparing the diagrams used to illustrate the solutions of the problems, forms have been chosen which are as simple in outline as the case will admit, upon the supposition that the reader will be able to make the application of the method described in connection with the same to his own especial case, which may embody more complicated forms. It must also be noted that, owing to the small scale to which the drawings in this work are necessarily made, extreme accuracy in the operations there performed is impossible. In many instances the length of the spaces used in dividing the profiles is much too great in proportion to the amount of curvature to insure accuracy. Therefore if apparent errors in measurements or results are found, they must not be considered the fault of the system taught. If such errors are discovered the student is recommended to reconstruct the drawing upon his own drawing board in accordance with the demonstration given and to a scale sufficiently large to insure accurate results, before passing judgment.

Occasions arise in the experience of every pattern cutter wherein some portion of the work before him, of relatively small importance, is so situated that the development of its pattern by a strictly accurate method would involve more labor and time than would be justified by the value of the part wanted. It is the purpose of this work to teach the principles of pattern cutting, leaving the decision of such questions to the individual. Nevertheless, if one is thoroughly conversant with pattern cutting methods and familiar with pattern shapes it may be possible in such cases to obtain accurately the principal points of a required pattern and to complete the same by the eye with sufficient accuracy for all practical purposes.

As intimated above, some of the demonstrations are necessarily made more explicit than others. In the longer demonstrations and those occurring near the ends of the Sections, less important details of the work are sometimes omitted and certain parts of the operation are only hinted at or are described in a general way, upon the supposition that the simpler problems in which the demonstrations are carried further into detail would naturally be studied first.

Although the principles of pattern cutting here set forth may at times be regarded as somewhat intricate, it is believed that any one possessed of a fair degree of intelligence and application can easily master them.


CHAPTER I. - Terms and Definitions

Pattern cutting as applied to sheet-metal work, by its very nature, involves the application of geometrical principles. Any treatise on descriptive geometry presents in a general way all the principles that enter into the science of pattern cutting. To those who have had the advantages of a mathematical education these principles are well known and by such their application is easily made. For the benefit of those, however, who have not had such advantages, this work purposes to make specific application of those principles in a way to be readily understood by the mechanic. While throughout the work the use of an unnecessary number of technical terms and words not in common use among mechanics will be carefully avoided, it must be here noted that precise language in describing all geometrical figures and operations becomes a necessity, and therefore compels the employment of some terms not in the everyday vocabulary of the workshop, which it is proper to define and explain at the outset.


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