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March/April 2010

Archive > 2010 > March/April 2010

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Feature Articles

Why Vacuum Carburizing
Heat treat alternative offers advantages over conventional methods.

Hybrid Economy, NASCAR Performance
VMT Technologies designs positively engaged, infinitely variable transmission.

Technical Articles

New Developments in Gear Hobbing
Several innovations have been introduced to the gear manufacturing industry in recent years. In the case of gear hobbing—the dry cutting technology and the ability to do it with powder-metallurgical HSS—might be two of the most impressive ones. And the technology is still moving forward. The aim of this article is to present recent developments in the field of gear hobbing in conjunction with the latest improvements regarding tool materials, process technology and process integration.

The Road Leads Straight to Hypoflex
A new method for cutting straight bevel gears.

High-Temperature Testing of Stanyl Plastic Gears: A Comparison with Tensile Fatigue Data
This paper shows an experimental study on the fatigue lifetime of high-heat polyamide (Stanyl) gears running in oil at 140°C. Based on previous works (Refs. 1–2), an analysis is made correcting for tooth bending and calculating actual root stresses. A comparison with tensile bar fatigue data for the same materials at 140°C shows that a good correlation exists between gear fatigue data and tensile bar fatigue data. This insight provides a solid basis for gear designers to design plastic gears using actual material data.

Departments

Hey Brother, Can You Spare Some Time (Publishers Page)
How you can get involved in a grassroots movement to save American manufacturing--and the American economy.

Crowning: A Cheap Fix for Noise and Misalignment Problems (Voices)
Fred Young, CEO of Forest City Gear, talks about sophisticated gear manufacturing methods and how they can help solve common gear-related problems.

Product News (Product News)
The complete Product News section from the March/April 2010 issue of Gear Technology.

Shot Peening Up Close and Personal (Events)
U.S. Shot Peening and Blast Cleaning Workshop.

Calendar (Events)
The complete Technical Calendar from the March/April 2010 issue of Gear Technology.

Industry News (Industry News)
The complete Industry News section from the March/April 2010 issue of Gear Technology.

Old Friends and Gear Machine Memories (Addendum)
A reflection by Michael Goldstein, Publisher & Editor-in-Chief.

Are We Going the Way of the Mayans and Romans (Other)
A review of "A Nation on Borrowed Time," a book by Joe Arvin and Scott Newton about the decline of America's ability to create wealth through manufacturing, and its effect on the overall economy.