June/July 2012

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Feature Articles

Gear Quality Inspection: How Good is Yours
How well you conduct your inspections can be the difference-maker for securing high-value contracts from your customers. And as with most other segments of the gear industry, inspection continues striving to attain “exact science” status. With that thought in mind, following is a look at the state of gear inspection and what rigorous inspection practices deliver—quality.

Growing Pains - Renewables Hang on in Turbulent Energy Market
The turbines are still spinning. They’re spinning on large wind farms in the Great Plains, offshore in the Atlantic and even underwater where strong tidal currents offer new energy solutions. These turbines spin regularly while politicians and policy makers— tied up in discussions on tax incentives, economic recovery and a lot of finger pointing—sit idle. Much like the auto and aerospace industries of years past, renewable energy is coping with its own set of growing pains. Analysts still feel confident that clean energy will play a significant role in the future of manufacturing—it’s just not going to play the role envisioned four to five years ago.

Technical Articles

Runout, Helix Accuracy and Shaper Cutters
Our experts discuss runout and helix accuracy, as well as the maximum number of teeth in a shaper cutter.

Asymmetric Gears: Parameter Selection Approach
In many gear transmissions, a tooth load on one flank is significantly higher and is applied for longer periods of time than for the opposite one; an asymmetric tooth shape reflects this functional difference. This paper describes an approach that rationalizes the degree of asymmetry (or asymmetry factor K) selection to meet a variety of operating conditions and requirements for custom gear drives.

Towards an Improved AGMA Accuracy Classification System on Double-Flank Composite Measurements
AGMA introduced ANSI/AGMA 2015–2–A06— Accuracy Classification System: Radial System for Cylindrical Gears, in 2006 as the first major rewrite of the double-flank accuracy standard in over 18 years. This document explains concerns related to the use of ANSI/AGMA 2015–2–A06 as an accuracy classification system and recommends a revised system that can be of more service to the gearing industry.

FZG Rig-Based Testing of Flank Load-Carrying Capacity Internal Gears
Micropitting, pitting and wear are typical gear failure modes that can occur on the flanks of slowly operated and highly stressed internal gears. However, the calculation methods for the flank load-carrying capacity have mainly been established on the basis of experimental investigations of external gears. This paper describes the design and functionality of the newly developed test rigs for internal gears and shows basic results of the theoretical studies. It furthermore presents basic examples of experimental test results.


Sustaining Expertise in the Gear Industry (Publishers Page)
Expertise is a resource that's hard to sustain. We're doing our part via our "Ask the Expert" feature. How about you?

Letters to the Editor (Voices)
A response to last issue's "Ask the Expert" feature on efficiency of hypoid gearing.

Tomorrow's Gear Inspection Systems: Arriving Just in Time (Product News)
Gleason's GMS analytical gear inspection systems provide all the right features at Eaton Corp.

Product News (Product News)
The complete Product News section from the June/July 2012 issue of Gear Technology.

Technical Calendar (Events)
The complete Technical Calendar from the June/July 2012 issue of Gear Technology.

Industry News (Industry News)
The complete Industry News section from the June/July 2012 issue of Gear Technology.

All Hail Leonardo (Addendum)
The ultimate Renaissance man was also a gear man. Addendum pays tribute to Leonardo da Vinci.