Since 1980 I have been involved in design and manufacturing of gears with leading automotive, marine, oil/gas, mining, and aerospace companies around the world. In 1986 I have developed my first software for 3d simulation of spiral bevel gear tooth geometry and tooth contact pattern based on manufacturing summary of Gleason gear cutting machines. The new method of gear geometry simulation was used for the first time in production of spiral bevel gears for Mi-28 helicopter in 1987. Accurate 3d modeling of the gear tooth has become very useful for commercial applications. In 1998 I have developed advanced engineering software library for Delphi division of General Motors which included 3d CAD modeling programs for worm face gears, worm gears, ball screws, variable ratio racks, helical gears. In 2002, in Fukuoka, Japan, I have presented a new spiral bevel gear software to simulate Gleason and Klingelnberg gear cutting in 3d with machine summary calculations. This spiral bevel software is known for the highest resolution of 3d modeling. The accurate 3d modeling capabilities of spiral bevel and hypoid gears have become popular since 2008 when 5-axis CNC machining of spiral bevel gears entered practical production. DMG, MAZAK, Breton, Overton, Brad Foote, Metso, NOV, Boeing, GM, UTC, Sandvik, Volvo, Rolls-Royce, NASA and other companies in 50 countries used my software to enter 3d CAD 5-axis CNC gear manufacturing business. 3-dimensional CAD simulation of different gears offers better solutions for gear design and manufacturing problems. ZAKGEAR covers variety of applications of the Direct Digital Simulation method - the foundation of ZAKGEAR CAD software.


1. Stepan V. Lunin New method of gear geometry calculation International Congress on Gears, Fukuoka, Japan, 2002

2. V.I. Goldfarb, S.V. Lunin, E.S. Trubchev. Direct Digital Simulations for Gears. Volume 1, Izhevsk 2004, ISBN 5-7526-0196-7, Published in Russia. English translation available at http://www.stepanlunin.com/book1.html

3. Stepan V. Lunin, Direct Digital Simulation Modeling. Gear Solutions magazine, May 2004, pages 32-38

4. Stepan Lunin, Front page cover, Image of the month: 3-dimentional model of orthogonal spiral bevel gear set with special tooth profile. Gear Technology magazine, May/Jun 2002

5. Goldfarb, Lunin, Trubachev. Advanced computer modeling technique in gear engineering. 2003 ASME Design Engineering Technical Conferences. September 2-6, 2003, Chicago, Illinois

6. Goldfarb, Lunin, Trubachev. Novel computer modeling technique in gear engineering. 2004 IFTMM Congress, China, Beijing, April 2004.

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