Pinions

GEAR TALK WITH CHUCK | 2018-04-12

Moderation Instead of Modification

Few designers would feel comfortable with a face to pinion pitch diameter ratio of 2.00 anymore. Some still prefer to select face width by face con...

GEAR TALK WITH CHUCK | 2018-04-03

How Much Helix Angle?

The most obvious difference between a spur gear and a helical gear is the presence of that “helix” angle. Civilians will call them “straight-cut” a...

GEAR TALK WITH CHUCK | 2018-03-22

Worm Basics - Part 2

Continuing our discussion of the “least you need to know” about worm gearing: 5. Efficiency is highly variable for worms. If it is critical to y...

GEAR TALK WITH CHUCK | 2018-03-06

Nothing Remains Constant

We cannot leave our lesson about tooth depths without covering bevel gears. There is a tendency to think of bevels and worms as being best left to ...

GEAR TALK WITH CHUCK | 2018-02-28

It Gets Complicated

Why did something as simple as a standard tooth form fail to get traction? While the old joke about the number of opinions at any meeting of engine...

GEAR TALK WITH CHUCK | 2018-01-11

The Beginning of Wisdom

Faithful followers of this blog can complete that mantra without prompting, but for new readers — the beginning of wisdom is calling things by thei...

GEAR TALK WITH CHUCK | 2017-12-12

Engineering Safety (Part One)

Watching the movie Deepwater Horizon got me thinking about current attitudes on workplace safety. (Full disclosure — I am a bit of a cr...

GEAR TALK WITH CHUCK | 2017-11-02

Swag of the Expo Awards

My last blog covered the motivation for the Swag of the Expo award and my inspiration in creating it. Top contenders that did not quite qualify for...

GEAR TALK WITH CHUCK | 2017-01-26

Way Waaay Back

Writing about my now cumbersome reference library prompted a bit of consolidation and reorganization. Unfortunately, my resolve diminished when I c...

GEAR TALK WITH CHUCK | 2016-11-08

Now the Work Resumes

With the election distraction finally behind us, we can hopefully get back to the very challenging job of building a better world for ourselves, ou...

GEAR TALK WITH CHUCK | 2015-12-31

One Last Blog for 2015

This blog completes our second year of blogs for the Gear Technology

GEAR TALK WITH CHUCK | 2015-07-30

New Ways to Make Old Parts
My last post discussed reviewing the ratings and designs of “legacy products,” those venerable parts and gearboxes still being ordered twenty, thir...

GEAR TALK WITH CHUCK | 2015-06-25

Fact Checks Needed

GEAR TALK WITH CHUCK | 2015-06-23

Peer Review Time
October may seem a long time from now, but preparations continue for the AGMA Fall Technical meeting. I’m not presenting a paper this year, but I j...

GEAR TALK WITH CHUCK | 2015-06-02

Areas of Expertise
One of the first things you hear upon becoming a parent is that “children keep you young.” Once, I foolishly thought this referred to your physical...

GEAR TALK WITH CHUCK | 2014-10-30

Moving the Goal Posts
[starbox]

GEAR TALK WITH CHUCK | 2014-10-09

Bad Career Moves
My e-mail correspondent was worried about making a bad career move. Since it is unlikely that people starting out in the gear trade today will work...

GEAR TALK WITH CHUCK | 2014-03-10

Hunting for an Argument
[starbox] One of the first things I learned about gears was the importance of having a “hunting tooth” combination. This was not open to discuss...

GEAR TALK WITH CHUCK | 2014-02-28

Internships: How Does the Employer Benefit? Part II
[starbox] In my previous post I talked about the official ways an internship program benefited our company. Today I’d like to talk about a coupl...

GEAR TALK WITH CHUCK | 2014-01-13

Introduction
[caption id="attachment_5" align="alignright" width="200"]

PUBLISHER'S PAGE | 2013-10-01

Opportunity Knocked
For anyone involved in gear manufacturing, Gear Expo is an absolute treasure. In 2013, it was bigger and more varied than it's been in a decade. With 226 exhibitors covering every conceivable gear-related technology, Gear Expo offered visitors unparalleled opportunities to interview potential new suppliers.

EVENTS | 2013-06-01

Liebherr Touts Technology at Latest Gear Seminar
For two days in Saline, Michigan, Liebherr's clients, customers and friends came together to discuss the latest gear products and technology. Peter Wiedemann, president of Liebherr Gear Technology Inc., along with Dr.-Ing. Alois Mundt, managing director, Dr.-Ing. Oliver Winkel, head of application technology, and Dr.-Ing. Andreas Mehr, technology development shaping and grinding, hosted a variety of informative presentations.

INDUSTRY NEWS | 2013-05-01

GT Extras
What's new on the Gear Technology website this month? Videos from DMG Mori-Seiki, the latest e-mail newsletter and updates on upcoming events, including the Kapp-Niles Rocky Mountain Gear School.

TECHNICAL ARTICLES | 2013-01-01

Large Pinions for Open Gears - The Increase of Single Mesh Load
This paper introduces mandatory improvements in design, manufacturing and inspection - from material elaboration to final machining - with special focus on today's large and powerful gearing.

TECHNICAL ARTICLES | 2012-05-01

Application of the First International Calculation Method for Micropitting
The first edition of the international calculation method for micropitting—ISO TR 15144–1:2010—was just published last December. It is the first and only official, international calculation method established for dealing with micropitting. Years ago, AGMA published a method for the calculation of oil film thickness containing some comments about micropitting, and the German FVA published a calculation method based on intensive research results. The FVA and the AGMA methods are close to the ISO TR, but the calculation of micropitting safety factors is new.

VOICES | 2012-01-01

The Global Challenge to America's Engineering and Innovation Position
John P. Walter and Abby Dress analyze the challenges facing America's manufacturers to remain competitive in a global environment.

TECHNICAL ARTICLES | 2012-01-01

Accelerating Validation Testing
Bringing new or improved products to market sooner has long been proven profitable for companies. One way to help shorten the time-to-market is to accelerate validation testing. That is, shorten the test time required to validate a new or improved product.

PRODUCT NEWS | 2011-05-01

Dearborn Precision Puts Dual Purpose Zeiss CMM to the Task
When parts you manufacture pass through numerous processes such as deep hole drilling, machining, hobbing and grinding, a CMM is essential when your customers require 100 percent in-process and final inspection.

TECHNICAL ARTICLES | 2011-01-01

Spiral Bevel Gears: Tribology Aspects in Angular Transmission Systems, Part IV
This article is part four of an eight-part series on the tribology aspects of angular gear drives. Each article will be presented first and exclusively by Gear Technology, but the entire series will be included in Dr. Stadtfeld’s upcoming book on the subject, which is scheduled for release in 2011.

TECHNICAL ARTICLES | 2010-07-01

Effects of Profile Corrections on Peak-to-Peak Transmission Error
Profile corrections on gears are a commonly used method to reduce transmission error, contact shock, and scoring risk. There are different types of profile corrections. It is a known fact that the type of profile correction used will have a strong influence on the resulting transmission error. The degree of this influence may be determined by calculating tooth loading during mesh. The current method for this calculation is very complicated and time consuming; however, a new approach has been developed that could reduce the calculation time.

FEATURE ARTICLES | 2010-03-01

Why Vacuum Carburizing
Heat treat alternative offers advantages over conventional methods.

PUBLISHER'S PAGE | 2007-05-01

The Gear Industry's Global Information Source
Have you ever been to Malaysia? How about Indonesia, Brazil, Slovakia or Russia? Well, we have. We go there every issue.

EVENTS | 2007-01-01

AGMA Delegates Meet Chinese Counterparts
The AGMA pavilion was a hot spot at October's PTC-Asia show in Shanghai, as evidenced by the intense quoting reported by exhibitors.

INDUSTRY NEWS | 2002-05-01

Industry News
Complete Industry News for May/June 2002.

FEATURE ARTICLES | 1999-09-01

Don't Miss These Booths!
We've contacted many of the gear industry's leading suppliers to find out what they'll be showing at Gear Expo 99. Booth numbers are current as of July 31, 1999, but they are subject to change. A current list of exhibitors and booth information is available at the AGMA Web site at www.agma.org.

TECHNICAL ARTICLES | 1993-01-01

High Technology Hobs
Today's high technology hobs are visible different from their predecessors. Gear hobs have taken on a different appearance and function with present day technology and tool and material development. This article shows the newer products being offered today and the reasons for investigating their potential for use in today's modern gear hobbers, where cost reduction and higher productivity are wanted.

TECHNICAL ARTICLES | 1992-07-01

Comparing Surface Failure Modes in Bearings and Gears: Appearances vs. Mechanisms
In the 1960's and early 1970's, considerable work was done to identify the various modes of damage that ended the lives of rolling element bearings. A simple summary of all the damage modes that could lead to failure is given in Table 1. In bearing applications that have insufficient or improper lubricant, or have contaminants (water, solid particles) or poor sealing, failure, such as excessive wear or vibration or corrosion, may occur, rather than contact fatigue. Usually other components in the overall system besides bearings also suffer. Over the years, builders of transmissions, axles, and gear boxes that comprise such systems have understood the need to improve the operating environment within such units, so that some system life improvements have taken place.

EVENTS | 1991-11-01

Calendar
Complete calendar for November/December 1991

TECHNICAL ARTICLES | 1990-11-01

The Involute Helicoid and The Universal Gear
A universal gear is one generated by a common rack on a cylindrical, conical, or planar surface, and whose teeth can be oriented parallel or skewed, centered, or offset, with respect to its axes. Mating gear axes can be parallel or crossed, non-intersecting or intersecting, skewed or parallel, and can have any angular orientation (See Fig.1) The taper gear is a universal gear. It provides unique geometric properties and a range of applications unmatched by any other motion transmission element. (See Fig.2) The taper gear can be produced by any rack-type tool generator or hobbing machine which has a means of tilting the cutter or work axis and/or coordinating simultaneous traverse and infeed motions.

PUBLISHER'S PAGE | 1990-05-01

Looking To The Future
Six years ago this month, the very first issue of Gear Technology, the Journal of Gear Manufacturing, went to press. The reason for starting the publication was a straightforward one: to provide a forum for the presentation of the best technical articles on gear-related subjects from around the world. We wanted to give our readers the information they need to solve specific problems, understanding new technologies, and to be informed about the latest applications in gear design and manufacturing. The premise behind Gear Technology was also a straightforward one: the better informed our readers were about the technology, the more competitive they and their companies would be int he world gear market.

TECHNICAL ARTICLES | 1988-09-01

Crowned Spur Gears: Optimal Geometry and Generation
Involute spur gears are very sensitive to gear misalignment. Misalignment will cause the shift of the bearing contact toward the edge of the gear tooth surfaces and transmission errors that increase gear noise. Many efforts have been made to improve the bearing contact of misaligned spur gears by crowning the pinion tooth surface. Wildhaber(1) had proposed various methods of crowning that can be achieved in the process of gear generation. Maag engineers have used crowning for making longitudinal corrections (Fig. 1a); modifying involute tooth profile uniformly across the face width (Fig. 1b); combining these two functions in Fig. 1c and performing topological modification (Fig. 1d) that can provide any deviation of the crowned tooth surface from a regular involute surface. (2)

TECHNICAL ARTICLES | 1986-11-01

Curvic Coupling Design
Curvic Couplings were first introduced in 1942 to meet the need for permanent couplings and releasing couplings (clutches), requiring extreme accuracy and maximum load carrying capacity, together with a fast rate of production. The development of the Curvic Coupling stems directly from the manufacture of Zerol and spiral bevel gears since it is made on basically similar machines and also uses similar production methods. The Curvic Coupling can therefore lay claim to the same production advantages and high precision associated with bevel gears.

TECHNICAL ARTICLES | 1985-05-01

The Design and Manufacture of Machined Plastic Gears
The use of plastic gearing is increasing steadily in new products. This is due in part to the availability of recent design data. Fatigue stress of plastic gears as a function of diametral pitch, pressure angle, pitch line velocity, lubrication and life cycles are described based on test information. Design procedures for plastic gears are presented.

VOICES | 1984-08-01

A Second Rate Society - Never
What was once recognized as the unique genius of America is now slipping away from us and, in many areas, is now seen as a "second rate" capability. Unless action is taken now, this country is in real danger of being unable to regain its supremacy in technological development and economic vigor. First Americans must understand the serious implications of the problem; and second, we must dedicate ourselves to national and local actions that will ensure a greater scientific and technological literacy in America.

Pinions

Material Grade in Gears