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Direct Gear Design for Spur and Helical Involute Gears - September/October 2002

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Archive > 2002 > September/October 2002 > Direct Gear Design for Spur and Helical Involute Gears

The article "Direct Gear Design for Spur and Helical Involute Gears" appeared in the September/October 2002 issue of Gear Technology.

Summary
Modern gear design is generally based on standard tools. This makes gear design quite simple (almost like selecting fasteners), economical, and available for everyone, reducing tooling expenses and inventory. At the same time, it is well known that universal standard tools provide gears with less than optimum performance and - in some cases - do not allow for finding acceptable gear solutions. Application specifies, including low noise and vibration, high density of power transmission (lighter weight, smaller size) and others, require gears with nonstandard parameters. That's why, for example, aviation gear transmissions use tool profiles with custom proportions, such as pressure angle, addendum, and whole depth. The following considerations make application of nonstandard gears suitable and cost-efficient:

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