DIGITEK NOTE - THIS HIGH RESOLUTION DIGITAL BOOK CONTAINS 366 PAGES AND IS SEARCHABLE AND PRINTABLE
PREFACE TO THIRD EDITION
The continued demand for a work on gearing along lines as originally planned by Charles H. Logue in 1910 has been so persistent that it has been deemed advisable to enlarge and revise the previous edition of the American Machinist Gear Book rather than to publish at the present time a new book on practical gear design and methods of production.
In doing so, parts of the original work which are no longer of particular value to the practical man have been omitted and other parts revised to bring the work up to date. The chief additions have consisted of sections devoted to varieties of bevel gears which have demonstrated their commercial value during the past few years; spiral type bevel gears and bevels of the Williams "master form" variety; to an exposition of the Williams System of Internal Gearing; and to the first presentation in book form of the successful development of the rolling process of gear production.
The section devoted to "Costs" in the Revised Edition has been omitted, not so much because it has grown obsolete, but because the developments in production methods have been so marked and radical in recent years that the question of costs has been complicated by a variety of production processes which do not lend themselves to direct comparison.
The section on "Practical Points in Gear Cutting" has also been omitted for the reason that gear cutting has now been very largely superseded by gear generation and the helpful hints on gear cutting are of little value in modern processes of gear generation.
NEW YORK, N. Y.