May 2014

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Feature Articles

Moving Parts
Machine tools boost speed and throughput with automation technology.

Coming Home, but to What
Many vets have the skills, but no place to apply them.

The Technology Shift
Decades ago, technology shifted from HSS to indexable inserts in turning and milling. This movement wasn't immediately realized in gear hobbing because coated PM-HSS hobs and complex gear profiles remained highly effective and productive methods. Only fairly recently have gear manufacturers started to take a serious look at indexable technology to cut gear teeth.

Technical Articles

Load Distribution Analysis of Spline Joints
A finite elements-based contact model is developed to predict load distribution along the spline joint interfaces; effects of spline misalignment are investigated along with intentional lead crowning of the contacting surfaces. The effects of manufacturing tooth indexing error on spline load distributions are demonstrated by using the proposed model.

Application and Improvement of Face Load Factor Determination Based on AGMA 927
The face load factor is one of the most important items for a gear strength calculation. Current standards propose formulae for face load factor, but they are not always appropriate. AGMA 927 proposes a simpler and quicker algorithm that doesn't require a contact analysis calculation. This paper explains how this algorithm can be applied for gear rating procedures.

Metallurgical Investigation of Tiger Stripes on a Carburized High Speed Pinion
Tiger stripes on a high-speed pinion made of a carburized SAE 9310 steel were investigated. The morphology of the damage was typical of electric discharge damage. The cause of the stripes and potential damage to the gear tooth were analyzed and are presented in this report.

Topological Gearing Modifications: Optimization of Complex Systems Capable of Oscillation
Vibration and noise from wind turbines can be significantly influenced - and therefore reduced - by selecting suitable gearing modifications. New options provided by manufacturers of machine tools and grinding machines, and especially state-of-the-art machines and controls, provide combined gearing modifications - or topological gearing corrections - that can now be reliably machined. Theoretical investigations of topological modifications are discussed here with the actual machining and their possible use.


Goodbye, David (Publishers Page)
I've lost a long-time and dear friend. Sadly, David Iveson of Westminster Machine Tools Ltd. in the U.K. passed away on April 9.

Is the Manufacturing Comeback Just an Illusion (Voices)
A great deal of attention has been paid to the decline of manufacturing in America, and I've been accused of being a town crier since the 1980s, when I began to see our nation lose its edge to foreign competition. My concerns have proven well-founded.

Product News (Product News)
The complete Product News Section from the May 2014 issue of Gear Technology.

Machine Marks on Gear Flanks (Q&A)
What causes shaving cutter marks on gear flanks and can they be prevented?

Calendar (Events)
The complete Technical Calendar from the May 2014 issue of Gear Technology.

Industry News (Industry News)
The complete Industry News section from the May 2014 issue of Gear Technology.

In Aviation, Pants Are Optional (Addendum)
The long and colorful history of aviation is comprised of many chapters and giants. The chapter we're reviewing in this installment of Addendum is the invention and development of the retractable landing gear.