February 2011

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February 2011 (Complete Issue PDF)

Feature Articles

Product Focus: Gears and Gear Drives
In this special news section, the editors of Power Transmission Engineering have gathered the latest product news and information from the gears and gear drives sector.

Drive-Based Integrated Safety
While safety functions have been integrated into drives packages for some years now, the current trends are very exciting, from many angles. Today, a full complement of safety functions can be implemented at the front-end of a system design on all types of production machines, including printing, packaging, converting, materials handling and other equipment used throughout American industry.

The Green Spin: Baldor Redefines Cooling Tower Performance
The Baldor Reliance RPM AC Cooling Tower Direct Drive Motor is designed exclusively for the cooling tower industry. This motor combines the technologies of the power-dense, laminated frame RPM AC motor with high performance, permanent magnet salient pole rotor designs.

Technical Articles

Not All Thin-Section Bearings Are Created Equal
American Bearing Manufacturers Association (ABMA) Standard 9 and ISO 281 give equations for calculating the basic dynamic radial load rating for ball bearings. These equations are based on a number of assumptions, many of which are not valid for thin-section bearings. (Thin-section bearings are described in ABMA standard 26.2.) Nevertheless, many thin-section bearing catalogs report load ratings based on these equations. Kaydon has developed a new method for calculating the dynamic radial load rating for thin-section ball bearings. The new method uses the contact stress and the number of stress-cycles-per-revolution to calculate the capacity. The new numbers are based on five years of actual test results. These equations can also be used to calculate the dynamic radial load rating for four-point contact ball bearings, which are not covered in ABMA standard 9 or ISO 281.

Opportunities Amidst Crises
Energy-challenged industries--and countries--can benefit from improved motor design and materials.

Airport Baggage Handling: Queue Conveyor Design from a Gearmotor Perspective
The primary driver of an airport baggage handling queue conveyor must be able to operate under increasingly demanding operating conditions, including frequent starting and stopping. The selection of the primary driver of the queue conveyor is dependent on multiple criteria, including dimensional requirements and durability characteristics.

Departments

Product News (Product News)
The complete Product News section from the February 2011 issue of Power Transmission Engineering.

Hannover Messe 2011 Preview (Events)
13 trade fairs examine smart efficiency.

Calendar (Events)
The complete technical calendar from the February 2011 issue of Power Transmission Engineering.

Industry News (Industry News)
The complete Industry News section from the February 2011 issue of Power Transmission Engineering.

With These Shoes, Some Say Even White Men Can Jump (Power Play)
“Banned by the NBA!” the headline screams. What are we talking here - Steroids? Gambling? Methamphetamines? Black socks? No - we’re talking shoes.