June 2015

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Feature Articles

Bevel Grinding Rolling Right Along
When Dr. Hermann J. Stadtfeld speaks, people tend to listen. Considered one of the world’s foremost experts on bevel gears, Stadtfeld, the vice president of bevel gear technology at Gleason, recently revealed several cutting-edge advancements that the company has been working on.

Gear Grinding is Getting Easier, Better, Faster, Stronger
Liebherr is well-known as one of the world’s largest privately owned companies — a titan in heavy industry specializing in cranes, trucks and mammoth earth moving and mining equipment.

Precision Gearing Lightens the Load for Off-Highway Equipment
Faith — paraphrasing the gospels of Matthew and Mark — can move mountains. But it helps if you have precision geared equipment.

Off-Highway or Off-Press, Andantex Focuses on Precision
Andantex USA is a part of the worldwide Redex group, a longtime provider of high-precision motion control components and systems

Technical Articles

The Basics of Gear Theory
Beginning with our June Issue, Gear Technology is pleased to present a series of full-length chapters excerpted from Dr. Hermann J. Stadtfeld’s latest scholarly — yet practical — contribution to the gear industry — Gleason Bevel Gear Technology. Released in March, 2014 the book boasts 365 figures intended to add graphic support of a better understanding and easier recollection of the covered material.

An Approach to Pairing Bevel Gears from Conventional Cutting Machine with Gears Produced on 5-Axis Milling Machine
Developed here is a new method to automatically find the optimal topological modification from the predetermined measurement grid points for bevel gears. Employing this method enables the duplication of any flank form of a bevel gear given by the measurement points and the creation of a 3-D model for CAM machining in a very short time. This method not only allows the user to model existing flank forms into 3-D models, but also can be applied for various other purposes, such as compensating for hardening distortions and manufacturing deviations which are very important issues but not yet solved in the practical milling process.

Test Facility Simulation Results for Aerospace Loss-of-Lubrication of Spur Gears
Prior to receiving airworthiness certification, extensive testing is required during the development of rotary wing aircraft drive systems. Many of these tests are conducted to demonstrate the drive system’s ability to operate at extreme conditions, i.e. — beyond that called for in the normal to maximum power operating range.

Optimal Modifications on Helical Gears for Good Load Distribution and Minimal Wear
Helical gear teeth are affected by cratering wear — particularly in the regions of low oil film thicknesses, high flank pressures and high sliding speeds. The greatest wear occurs on the pinion — in the area of negative specific sliding. Here the tooth tip radius of the driven gear makes contact with the flank of the driving gear with maximum sliding speed and pressure.

Departments

Good Morning, Class (Publishers Page)
Since we began publishing in 1984, Gear Technology's mission has been to educate our readers. For 31 years, we've shown you the basics of gear manufacturing as well as the cutting edge. We take our educational mission quite seriously, and we go through steps that most publishers don't have time for or wouldn't consider.

Product News (Product News)
Latest News about Gear Industry Products

Gear mesh, NVH Evaluation (Ask the Expert)
The question is quite broad, as there are different methods for setting various types of gears and complexity of gear assemblies, but all gears have a few things in common.

Calendar (Events)
Calendar of Events for the Industry

Industry News (Industry News)
News from Around the Gear Industry

The Fixie Fixation (Addendum)
In David Koepp’s 2012 bicycle messenger actionthriller Premium Rush (yes, apparently that is an actual genre), Joseph Gordon-Levitt’s beleaguered hero Wilee deadpans...