TOPICS CALENDAR BUYER'S GUIDE AGMA

Tooth Bending

TECHNICAL ARTICLES | 2022-04-25

Tooth Root Bending Strength of Shot-Peened Gears Made of High-Purity Steels up to the VHCF Range

Standardized methods, like AGMA 2001-D04 or ISO 6336 for the calculation of the load carrying capacities of gears are intentionally conservative to ensure broad applicability in industrial practice. However, new applications and higher requirements often demand more detailed design calculations nowadays; for example: long operating lives in wind power gearboxes or fewer gear stages and higher speeds in e-mobility applications result in higher load cycles per tooth in a gearbox.

TECHNICAL ARTICLES | 2021-07-01

Single Tooth Bending Fatigue Testing at any R Ratio

Evaluation of the bending fatigue performance (stress to life relationship) of different gear materials subject to various manufacturing processes and why subsequent post processing treatments are of significance to gear and transmission designers.

GEAR TALK WITH CHUCK | 2019-03-26

Remembering the Giants

While writing about the “degrees of connection” between current industry leaders and th...

TECHNICAL ARTICLES | 2018-11-01

The Influence of a Grinding Notch on the Gear Bending Strength Rating

To achieve the requested quality, most gears today are ground. The usual grinding process includes treating the gear flank but disengaging before reaching the root rounding area. If the gear is premanufactured with a tool without protuberance, then at the position where the grinding tool retracts from the flank a grinding notch in the tooth root area is produced. Such a notch may increase the bending stresses in the root area, thus reducing the strength rating.

GEAR TALK WITH CHUCK | 2018-06-14

Options for Material Selection

Disclaimer: This is the policy I follow for material selection. Your situation may call for a different decision. You should not adopt this pol...

GEAR TALK WITH CHUCK | 2018-05-31

Parsing the Fine Print

If my last posting prompted you to look at a copy of a material cert, you probably noticed that the cert has much more information on it than just ...

GEAR TALK WITH CHUCK | 2018-04-26

Actions Have Consequences

The initial motivation for changing outside diameters was the avoidance of undercutting. Designers, engineers, and theoreticians quickly discovered...

GEAR TALK WITH CHUCK | 2018-04-19

Hunting for a Solution

Most of you are excused for missing the attempted humor in the above headline. So, I will violate the first rule of comedy and explain the joke. An...

GEAR TALK WITH CHUCK | 2017-09-26

Where Did All the Big Projects Go?

Remembering the “good old days” too often or too fondly is an occupational hazard for a veteran blogger like me. I try to temper “story time” with ...

INDUSTRY NEWS | 2015-06-01

Industry News

News from Around the Gear Industry

TECHNICAL ARTICLES | 2009-11-01

Bending Fatigue Tests of Helicopter Case Carburized Gears: Influence on Material, Design and Manufacturing Parameters

A single tooth bending (STB) test procedure has been developed to optimally map gear design parameters. Also, a test program on case-carburized, aerospace standard gears has been conceived and performed in order to appreciate the influence of various technological parameters on fatigue resistance and to draw the curve shape up to the gigacycle region.

TECHNICAL ARTICLES | 2006-07-01

Generating Interchangeable 20-Degree Spur Gear Sets with Circular Fillets to Increase Load Carrying Capacity

This article presents a new spur gear 20-degree design that works interchangeably with the standard 20-degree system and achieves increased tooth bending strength and hence load carrying capacity.

TECHNICAL ARTICLES | 1996-11-01

The Advantages of Ion Nitriding Gears

When it comes to setting the standard for gear making, the auto industry often sets the pace. Thus when automakers went to grinding after hardening to assure precision, so did the machine shops that specialize in gearing. But in custom manufacturing of gears in small piece counts, post-heat treat grinding can grind away profits too.

VOICES | 1987-07-01

No Surprise

For the last few years, the market has been tough for the U.S. gear industry. That statement will cause no one any surprise. The debate is about what to do. One sure sign of this is the enormous attention Congress and the federal government are now placing on "competitiveness."

FEATURE ARTICLES | 1986-09-01

Tooth Strength Study of Spur Planet Gears

In the design of any new gear drive, the performance of previous similar designs is very carefully considered. In the course of evaluating one such new design, the authors were faced with the task of comparing it with two similar existing systems, both of which were operating quite successfully. A problem arose, however, when it was realized that the bending stress levels of the two baselines differed substantially. In order to investigate these differences and realistically compare them to the proposed new design, a three-dimensional finite-element method (FEM) approach was applied to all three gears.

TECHNICAL ARTICLES | 1985-09-01

Single Flank Data Analysis and Interpretation

Much of the information in this article has been extracted from an AGMA Technical Paper, "What Single Flank Testing Can Do For You", presented in 1984 by the author

TECHNICAL ARTICLES | 1985-07-01

Dynamic Analysis of Straight and Involute Tooth Form

The effect of load speed on straight and involute tooth forms is studied using several finite-element models.