The Design and Construction of Cams (Classic Reprint) - Softcover

Smith, Charles F.

9781332008650: The Design and Construction of Cams (Classic Reprint)

Softcover

ISBN 10: 1332008658 ISBN 13: 9781332008650

Verlag: Forgotten Books, 2018

Alle Exemplare dieser ISBN-Ausgabe

1 Gebraucht

Von EUR 15,20

2 Neu

Von EUR 19,69

Excerpt from The Design and Construction of Cams

The contents of this book, up to but not including Chapter X, describe the methods used by Mr'. C. F. Smith, and the illustrations up to the same point are from drawings by him. The analysis and description of these methods are by Mr. F. A. Halsey, as is the section on the monotype cams. Other chapters are credited to their authors in foot-notes.

Mr. Smith has been connected with the construction of machinery involving the use of cams for twenty-five years, during fifteen of which he has made the design of such machinery a specialty. As a result of this extended experience he has developed the line of procedure which is herein explained and which is in the highest degree successful. He has designed machines containing as many as twenty cams and his experience is uni formly that given in connection with the chain-making machine illustrated in later pages. The cams are laid out on paper and constructed and key-seated from the drawings, and when assembled they perform their work in entire harmony and without filing, doctoring, or changing.

Such results need no comment and it is particularly fortunate that, instead of basing the explanations on hypothetical cases, it has been possible to use as illustrations the cams of a highly successful machine.

Of course, no single machine exhausts all the varieties of cams and, after showing how the cams of the chain machine were laid out and made, other varieties of cams which are not included in it are shown. Up to Chapter X these are all drawn from Mr. Smith's fund of experience and hence in no sense represent hypothetical conditions.

The prejudice that exists in many quarters against the employment of cams is un founded. The movements which they are capable Of giving is unlimited, and in cases in which other means will give the movement it is often at the expense Of increased compli cation and trappy construction. Properly designed on the lines laid down, nothing can be more satisfactory than the operation Of cams, the design Of which is not a matter of good luck or of expensive experiment, but results directly from the intelligent application of general principles.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.

Rese�a del editor

Excerpt from The Design and Construction of Cams

In any discussion of cams we must distinguish two kinds. The first is that in which the only requirement is that the operating point shall move a given distance, the movement beginning and ending at certain points in the revolution of the cam shaft. The second is that in which there is an additional requirement that the operating point shall at all times during its movement occupy predetermined positions. The first kind is much the more numerous and its discussion will form the chief subject of what follows, though the methods of laying out the second kind will also be shown. It will be noted that when laying out the first kind we are at full liberty to lay out the cam groove with a view to avoiding abruptness of movement, whereas, with the second kind, the movements being prescribed, we have much less liberty in this respect. It might be imagined at first thought that we have no such liberty, but this is not so, since with this, as with the first variety, more favorable angles of the cam grooves may be obtained by increasing the diameters of the cams.

Order of Work when Laying Out Automatic Machines

The starting point when designing any piece of automatic machinery is the work to be done. The piece to be operated upon is to be put through certain processes involving movements of the piece itself and of the chucking devices and other tools which operate upon it, and the sequence of these movements must first be worked out. The procedure to be described is to first design the end of the machine which operates upon the piece to be manipulated, deciding upon the operations to be performed and the movements to be made, and from this to work backward to the cams which are to give these movements and then to build the frame around the mechanism so designed. Of course, in this kind of work, like all others, the element of cut and try enters, and developments during the later stages of the process often make it necessary to retrace ones steps, but, broadly speaking, the order of work is as described:

1. Determine the sequence and character of the movements at the point where the work is to be done.

2. Determine the locations and forms of the cams necessary to give those movements.

3. Fill in the frame around this mechanism.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.