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September/October 2002

Archive > 2002 > September/October 2002

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Feature Articles

New Technology at IMTS
The following products were selected because they hold the most interest for gear industry professionals.

More IMTS Stuff
Student Summit Introduces Next Generation to Manufacturing The IMTS 2002 Show offers an opportunity for students, ranging from grade school to college, to take part in the exhibition.

Technical Articles

Carburizing of Big Modulea sn Large Diameter Gears
Carburized gears have higher strengths and longer lives compared with induction-hardened or quench-tempered gears. But in big module gears, carburizing heat-treatment becomes time-consuming and expensive and sometimes cannot achieve good hardness due to the big mass-effect. Also, it is not easy to reduce distortion of gears during heat treatment.

Direct Gear Design for Spur and Helical Involute Gears
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:

Meausring Profile and Base Pitch Error with a Micrometer
In this article, equations for finding profile and base pitch errors with a micrometer are derived. Limitations of micrometers with disc anvils are described. The design of a micrometer with suitable anvils is outlined.

Departments

Relief Valve (Publishers Page)
Some of the pressure on American manufacturers seems to be letting up. This is welcome relief, considering the squeeze they have been under for the past few years.

Product News (Product News)
Complete Product News for September/October 2002.

Revolutions (Revolutions)
Welcome to Revolutions, the column that brings you the latest, most up-to-date and easy-to-read information about the people and technology of the gear industry.

Technical Calendar (Events)
Complete Technical Calendar for September/October 2002.

Gear Industry News (Industry News)
Completer Industry News for September/October 2002.

Gears of Rockwell Hardness (Addendum)
Nobody's sure what went on in Bolsa Chica, CA, when gear-shaped stones were used there 8,700 years ago, but a popular belief is that at least some activity revolved around manufacturing.