March 2015

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March 2015 (Complete Issue PDF)

Feature Articles

Diagnosing the Health of Medical Motors
John Morehead, national sales manager of Crouzet Motors (Vista, CA), was bunkered down in his office in Palatine, IL surrounded at all points by ankle-deep snow from an unfortunately terrible Chicago’s winter night.

The Future Rests on the River Leine
“[Motion, Drive & Automation] at Hannover Messe is the place where the future is determined.”

Engineering Showcase 2015
One of our goals at Power Transmission Engineering is to help you understand, identify and select the best technology for your mechanical power transmission or motion control applications. With every project, you have to decide which components to use, and which suppliers, based on functionality, quality and price. We aim to help you make those decisions informed by providing the latest information on current technology, especially when it comes to mechanical components.

Technical Articles

Precision Bellows Couplings
Bellows couplings first began to be widely used by machine tool builders in the mid-to-late 20th century. With the advent of CNC technology, machine engineers started looking to improve upon some of the negative influences traditional power transmission couplings can have on a precision rotary / linear motion system.

The Modified Life Rating of Rolling Bearings: A Criterion for Gearbox Design and Reliability Optimization
Engineers typically learn that the bearing L10 life can be estimated using the so called “C/P method” — or the “basic rating life” of the bearing, a method rooted in the 1940s. Major developments have since led to the “modified rating life,” released in ISO 281:2007, which includes the aiso life modification factor. In this paper a succession of equations used for bearing life ratings are reviewed, and current bearing life rating practices are discussed in detail. It is shown that — despite the introduction more than 30 years ago of the adjustment factor of the basic rating life, and the standardization in 2007 of the aiso modification factor — use of these improved calculation methods are not practiced by all engineers. Indeed — many continue referring to the old model as a way of seeking compliance with existing, established practices.

Four-Point Bearings Do Triple Duty While Saving Space
A four-point contact ball bearing makes it easy to simplify machine designs that combine radial, thrust and moment loads, because it can handle all three simultaneously. They are primarily used for slow-to-moderate-speed applications, or where oscillatory movement is predominant.

Departments

Engineering Extravaganza (Publishers Page)
This issue we present our Hannover Fair preview. As most of you know, Hannover is one of the biggest trade shows on Earth, and by far the largest that includes a significant focus on mechanical power transmission components.

Global Industrial Outlook: Oil Slick, Currency Headwinds Challenge Growth (Market Update)
End market conditions for the power transmission industry have arguably worsened since our last column. In December we stated that with two armed conflicts underway impacting economic performance in Eastern Europe and the Middle East our stance was “Buy on the Sound of Cannons…. Selectively” while cautioning PTE readers not to be sanguine.

Product News (Product News)
New products within the Industry

CALENDAR (Events)
Events Calendar

INDUSTRY NEWS (Industry News)
News From the Industry

3-D PRINTING IS HERE! (Power Play)
Necessity is the Mother of Invention, goes the bromide, but this 3-D printing thing is taking manufacturing to an entirely different — yes — dimension.