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Excerpt from Cam Design and Manufacture Cam movements are among the most useful that the machine designer has at his command, for without them many complicated motions could not be laid out and constructed. When cams are laid out by cut-and-try methods (which is often the case), they are noisy in operation, create a vast amount of friction and are short-lived. On the other hand, if the curves are properly laid out, giving all possible time for the rises, the finished cams can be run at high speeds with very little noise or friction. Under these conditions, cams compare favorably in construction cost and maintenance cost with more complicated mechanical movements used for the same purpose. When it is considered that a practical knowledge of cam design and manufacture is easily acquired, it may seem strange that the majority of technical works on machine design treat this subject lightly; or at least from only a theoretical point of view. While it can not be claimed that any one person knows the whole subject thoroughly, it is certainly possible to explain some of the methods that are in actual use for laying out and cutting cams. The use of the various methods and appliances that are described is not confined to any one locality, by any means, as these methods and appliances have been found in practically every manufacturing center of the country. In the description of the various methods, the writer has avoided using complicated mathematical formulas as it is well known that very few men actually engaged in machine design and construction thoroughly understand them. 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.
The use of computers for engineering design, and in CNC for manufacturing, has dramatically changed the cam design and manufacturing process. Additionally, cam design and manufacturing have been affected by a significant number of fundamental research results published in recent years. This new edition offers changes which have been made throughout the book to update its information with the latest technology from the engineering literature and from the author's research and that of his students. Beginning at an introductory level and progressing to more advanced topics, this it provides all the information needed to properly design, model, analyze, specify, and manufacture cam-follower systems. It is truly a comprehensive resource that brings together up-to-date cam design technology, correct design and manufacturing procedures, and recent cam research results-all in one volume Additionally, this unique book is accompanied by a 90-day trial demonstration copy of the Professional Version of Dynacam. Written by the author and used worldwide, this program solves the equations described in the book and allows in its fully licensed version the design, dynamic modeling, analysis, and generation of follower center, cam surface, and cutter coordinate data for any cam. It also defines conjugate cams for any application. Includes a completely rewritten and updated chapter on splines, along with a discussion of shape-preserving splines as currently used for automotive valve-train cams. Features added coverage of multi-degree of freedom models and of followers with deliberate impact events within the chapter on dynamic modeling. Covers Globoidal cams in several chapters. Provides a definitive solution to the torque compensation cam design problem. Program Dynacam is much enhanced and improved and is available at a preferred price to purchasers of the book.
This book provides the methods of solving the problems connected with cams—their design, application, and manufacture. It introduces the improvement of numerically controlled machine tools and the availability of computers in general. The book is useful for practicing and design engineers.
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
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.
This book provides the methods of solving the problems connected with cams--their design, application, and manufacture. It introduces the improvement of numerically controlled machine tools and the availability of computers in general. The book is useful for practicing and design engineers.
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.