Pressure Angle

GEAR TALK WITH CHUCK | 2018-05-10

What’s Your Angle?

Hulet self-unloader image courtesy of ASME. Interesting things happen when you start using “non-standard” gear geometry. As early as th...

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 | 2018-04-25

The Long and Short of It

One of the problems with “tribal knowledge” is that the terminology can confuse those who are not fully immersed in that community. I have lost ...

GEAR TALK WITH CHUCK | 2018-04-17

How Many Teeth Do You Want?

Designing gears is somewhat of a mathematical puzzle. You have lots of interconnected factors to play with in hopes of finding the “best” overall s...

GEAR TALK WITH CHUCK | 2018-03-15

What About Worms?

It is difficult to know where to start when writing about worm gears, because this market segment has defied “standardization” within the United St...

GEAR TALK WITH CHUCK | 2018-03-01

Out of Your Depth?

How did that over pin calculation work out? My congratulations if you managed to work your way through it without tearing your hair out. Guess what...

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 | 2018-02-22

If Only It Was That Simple

In my last blog we went over “pitch” descriptions for spur gears. Engineers being stubborn individuals, it has not been possible to reach a consens...

GEAR TALK WITH CHUCK | 2018-01-30

Appreciating the Spur Gear

When the average civilian hears the word “gear,” if they think of mechanical things at all, they envision a big spur gear, perhaps in a clock or wi...

GEAR TALK WITH CHUCK | 2017-11-16

Herringbones 102

Imagine for a moment that your boss invented the herringbone tooth form and tasked you with building machines to cut them. This was the situation P...

GEAR TALK WITH CHUCK | 2017-09-14

Developing Resilience

For many years, “robust” was a popular business buzz word. The idea was to make certain your procedures and processes were “strong” enough to withs...

TECHNICAL ARTICLES | 2017-06-01

Designing Very Strong Gear Teeth by Means of High Pressure Angles

The purpose of this paper is to present a method of designing and specifying gear teeth with much higher bending and surface contact strength (reduced bending and surface contact stresses). This paper will show calculation procedures, mathematical solutions and the theoretical background equations to do this.

TECHNICAL ARTICLES | 2017-01-01

Repair of Large, Surface-Degraded Industrial Gears - a New Approach

This paper presents a new approach to repair industrial gears by showing a case study where pressure angle modification is also considered, differently from the past repairing procedures that dealt only with the modification of the profile shift coefficient. A computer program has been developed to automatically determine the repair alternatives under two goals: minimize the stock removal or maximize gear tooth strength.

TECHNICAL ARTICLES | 2016-06-01

Worm Gear Efficiency Estimation and Optimization

This paper outlines the comparison of efficiencies for worm gearboxes with a center distance ranging from 28 - 150 mm that have single reduction from 5 to 100:1. Efficiencies are calculated using several standards (AGMA, ISO, DIN, BS) or by methods defined in other bibliographic references. It also deals with the measurement of torque and temperature on a test rig — required for the calibration of an analytical model to predict worm gearbox efficiency and temperature. And finally, there are examples of experimental activity (wear and friction measurements on a blockon- ring tribometer and the measurements of dynamic viscosity) regarding the effort of improving the efficiency for worm gear drivers by adding nanoparticles of fullerene shape to standard PEG lubricant

PUBLISHER'S PAGE | 2015-06-01

Good Morning, Class

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.

ASK THE EXPERT | 2014-11-01

Small-Module Gear Design

Gears with a diametral pitch 20 and greater, or a module 1.25 millimeters and lower, are called fine-pitch or low-module gears. The design of these gears has its own specifics.

FEATURE ARTICLES | 2014-09-01

Gear Manufacturer Benefits from CAM Initiatives and Advanced Manufacturing Technology

Multiple CAM initiatives at Snyder Industries are improving safety, quality and productivity for parts ranging from 50 to 5,000 lbs.

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.

FEATURE ARTICLES | 2013-05-01

Operating Pressure Angle

What is the difference between pressure angle and operating pressure angle?

EVENTS | 2012-05-01

Technical Calendar

The complete Technical Calendar from the May 2012 issue of Gear Technology.

ADDENDUM | 2012-03-01

The New Now: U.S. Workforce Sustainability

Faithful Addendum readers are accustomed to finding upbeat, whimsical and oddball stories about gears in this space. What follows is not about gears, exactly. Rather, it is, as opposed to the usual bleak news about America losing its manufacturing mojo—a look at a positive, hopeful development in that regard.

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.

FEATURE ARTICLES | 2012-01-01

New Energy - Same Challenges

Uncertainty casts a shadow over future business opportunities for manufacturers serving the new energy markets.

EVENTS | 2011-11-01

IPTEX 2012 Preview

India is rapidly turning into a global manufacturing hub, thanks to the country’s manufacturing and engineering capabilities, vast pool of skilled expertise and its size. These qualities offer it a strategic advantage for the manufacturing segment. A large number of international companies in varied segments have already set up a manufacturing base in India and others are following suit. It only makes sense to bring this industry segment together under one roof to discuss the current trends and technology prevalent to the marketplace. IPTEX 2012 is scheduled from February 9–11, 2012 at the Bombay Exhibition Center in Mumbai, India.

FEATURE ARTICLES | 2011-08-01

Chiming in on Gear Noise: Three Experts Have their Say

It is said that “The squeaky wheel gets the grease.” Ok, but what about gear noise? We talked to three experts with considerable knowledge and experience in this area.

FEATURE ARTICLES | 2010-09-01

What's the Big Attraction - IMTS 2010

The great thing about a trade show the size of IMTS is the amount of options available to attendees. If you’re into cars, fighter jets, machine tools, fighting robots, manufacturing relics or simply the latest technology advancements in a particular industry, you’ll find it at IMTS 2010.

FEATURE ARTICLES | 2009-09-01

Grinding Gears for Racing Transmissions

When you push 850 horsepower and 9,000 rpm through a racing transmission, you better hope it stands up. Transmission cases and gears strewn all over the racetrack do nothing to enhance your standing, nor that of your transmission supplier.

TECHNICAL ARTICLES | 2001-03-01

The Calculation of Optimum Surface Carbon Content for Carburized Case Hardened Gears

For high-quality carburized, case hardened gears, close case carbon control is essential. While tight carbon control is possible, vies on what optimum carbon level to target can be wider than the tolerance.

TECHNICAL ARTICLES | 1995-07-01

How to Avoid Errors When Measuring Step Gears

There are problems in dimensional measurement that should be simple to solve with standard measuring procedures, but aren't. In such cases, using accepted practices may result in errors of hundreds of microns without any warning that something is wrong.

INDUSTRY NEWS | 1993-07-01

Gear Tip Chamfer and Gear Noise; Surface Measurement of Spiral Bevel Gear Teeth

Could the tip chamfer that manufacturing people usually use on the tips of gear teeth be the cause of vibration in the gear set? The set in question is spur, of 2.25 DP, with 20 degrees pressure angle. The pinion has 14 teeth and the mating gear, 63 teeth. The pinion turns at 535 rpm maximum. Could a chamfer a little over 1/64" cause a vibration problem?

VOICES | 1985-09-01

Industry Forum

Your May/June issue contains a letter from Edward Ubert of Rockwell International with some serious questions about specifying and measuring tooth thickness.

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

INDUSTRY NEWS | 1984-05-01

The Process of Gear Shaving

Gear shaving is a free-cutting gear finishing operation which removes small amounts of metal from the working surfaces of the gear teeth. Its purpose is to correct errors in index, helical angle, tooth profile and eccentricity.