January/February 2011

Protecting Our Own

Publisher Michael Goldstein discusses the loss of U.S. manufacturing capability and what we should do about it.

Writing the Standards

Gary A. Bish, director of product design technology for Horsburgh & Scott, discusses his role as chairman of the AGMA mill gearing committee.

Point-Surface-Origin Macropitting Caused by Geometric Stress Concentration

Point-surface-origin (PSO) macropitting occurs at sites of geometric stress concentration (GSC) such as discontinuities in the gear tooth profile caused by micropitting, cusps at the intersection of the involute profile and the trochoidal root fillet, and at edges of prior tooth damage, such as tip-to-root interference. When the profile modifications in the form of tip relief, root relief, or both, are inadequate to compensate for deflection of the gear mesh, tip-to-root interference occurs. The interference can occur at either end of the path of contact, but the damage is usually more severe near the start-of-active-profile (SAP) of the driving gear.

Measurement of Directly Designed Gears with Symmetric and Asymmetric Teeth

In comparison with the traditional gear design approach based on preselected, typically standard generating rack parameters, the Direct Gear Design method provides certain advantages for custom high-performance gear drives that include: increased load capacity, efficiency and lifetime; reduced size, weight, noise, vibrations, cost, etc. However, manufacturing such directly designed gears requires not only custom tooling, but also customization of the gear measurement methodology. This paper presents definitions of main inspection dimensions and parameters for directly designed spur and helical, external and internal gears with symmetric and asymmetric teeth.

Spiral Bevel Gears: Tribology Aspects in Angular Transmission Systems, Part IV

This article is part four of an eight-part series on the tribology aspects of angular gear drives. Each article will be presented first and exclusively by Gear Technology, but the entire series will be included in Dr. Stadtfeld’s upcoming book on the subject, which is scheduled for release in 2011.

The Merits of Multifunctional Machining

Higher productivity, faster setup times and single unattended operations are just a few of the capabilities gear manufacturers seek in the multifunctional machine tool market.

Big Gears Better and Faster

Indexable carbide insert cutting tools for gears are nothing new. But big gears have recently become a very big business. The result is that there's been a renewed interest in carbide insert cutting tools.

Now, More than Ever - Gear Training

Gear education and training are vital to sellers, buyers and national security. This article explores gear training options available in the USA.

Gear Training - Courses, Schedules, Rates and More

The following article provides details on the specific programs and learning opportunities discussed in the January/February 2011 article "Now, More Than Ever" by senior editor Jack McGuinn.

Gears - Subculture Chic

Whether consumed by its romantic charm or simply a casual fan of its Victorian sensibilities, there’s a growing interest in all things steampunk lately. From books, television and films to music, art and design, the desire to ‘reclaim technology’ is getting closer and closer to mainstream pop culture. Wherever you find steampunk, you’ll undoubtedly find a gear or two not far behind.

Gear Chamfering Robot

Banyan Technologies introduces a robotic chamfering device suitable for deburring, chamfering and radiusing the edges of slew bearing ring gears.

Product News

The complete product news section from the January/February 2011 issue of Gear Technology.

Industry News

The complete Industry News section from the January/February 2011 issue of Gear Technology.

AMB 2010 Points to Recovery

With 86,202 visitors, The International Exhibition for Metal Working (AMB 2010) in Stuttgart, Germany, managed to slightly exceed attendance from the 2008 show (85,143). The metalworking industry celebrated its comeback with visitors from more than 80 countries. In addition, AMB 2010 set a new record with 1,346 exhibitors (2008: 1,306).

Technical Calendar

The complete technical calendar section from the January/February 2011 issue of Gear Technology.