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"This book was written by [an] engineer for engineers, to show an alternative to the traditional way of gear design."
—Wonderpedia, Today's Featured Article 03.10.2014
"Direct Gear Design is a must-have book for the modern gear specialist. To be competitive, the world is looking for alternative methods to make new products. The gear production industry is not an exception. Finite element analysis, digital simulation tools, computer-controlled machining, [and] new materials demand the development of new approaches to design gears. Direct Gear Design by Alexander L. Kapelevich is exactly the book that established or new generation engineers should look for. It is practical; informative; includes recommendations, useful charts, diagrams, and tables; provides valuable information on gear geometry limitations; and brings implementation examples of different gearbox applications. The book introduces a new vision of gear design while addressing the old gear design challenges of reducing the stress level and increasing reliability of the gear trains."
—Mr. Yuriy Gmirya, Sikorsky Aircraft Corporation, USA
"… a useful tool for gear and transmission designers to come up with optimum gear design. Today we are forced to increase load carrying capacity, reduce transmission weight, and fulfill noise requirements without increasing manufacturing costs. The described new method, Direct Gear Design, and asymmetric gear design are helpful to reach this target."
—Dr. Franz J. Joachim, ZF Friedrichshafen AG, Germany
"A modern description of how gears should be designed today when we have computer tools that allow us to optimize our gear designs far beyond what the standards allow us."
—Dr. Anders Flodin, Höganäs AB, Sweden
"Finally, a new book that deals with gear macrogeometry! While many papers are being published on microgeometry/gear corrections, only little work is published on the more important issue of gear macrogeometry optimization. This book opens up a new window of opportunity for the gear designer, and it deals with one of the few gear geometry types not yet fully utilized, asymmetric gears. This is most welcome, as it will encourage designers to think ‘outside the box’. And with today’s gear-cutting technologies (e.g., direct machining), the manufacturing of non-standard gears displaying superior performance is feasible at little cost increase. Furthermore, the book covers a wide area of gear types and gives practical hints on how to balance gear strength, how to design high addendum gears, and how to achieve unusually high ratios."
—Mr. Hanspeter Dinner, EES Gear GmbH, Switzerland
Dr. Alexander L. Kapelevich is a gear design consultant at AKGears, LLC. He holds a master’s degree in mechanical engineering at Moscow Aviation Institute and a Ph.D. degree in mechanical engineering at Moscow State Technical University. Dr. Kapelevich has more than 30 years of custom gear transmission research and design experience. He began his career working in the Russian aviation industry, where he was involved in R&D, software development, testing, and failure investigation for aerospace gear transmissions. Living in the United States since 1994, he developed the Direct Gear Design® methodology for custom gear transmissions that have been implemented in various fields, such as aerospace, automotive, agriculture, defense, robotics, racing, and many others. His specialties are the gear drive architecture, planetary systems, gear tooth macrogeometry optimization, gears with asymmetric teeth, and gear transmission performance maximization. Dr. Kapelevich is a member of American Gear Manufacturers Association.