Accuracy

GEAR TALK WITH CHUCK | 2017-11-28

Department of Corrections

It was brought to my attention that the graphics used in my recent “herringbone” postings actually show double helical gears. I have a great suppor...

FEATURE ARTICLES | 2017-09-01

ASM Heat Treat 2017

Don't miss these exhibitors co-located with Gear Expo.

FEATURE ARTICLES | 2017-08-01

When a gearbox remanufacturer is trying to decide whether to regrind or replace a gear, any number of factors could be running through their head. Here are some remanufacturers' processes on how they reach the conclusions they do, and why you should listen to them.

GEAR TALK WITH CHUCK | 2017-05-19

Exploring New Methods

I have been following developments on gear making in general-purpose CNC machines with great interest. The advent of affordable gear grinding seems...

GEAR TALK WITH CHUCK | 2017-03-28

Should Gear Technology be Open Source?

One of the few things I miss about my old commute is all the great content I heard on public radio. Ten hours a week of news, in depth features, an...

GEAR TALK WITH CHUCK | 2017-02-21

Unreasonable Backlash

Not to worry — no politics here. The “backlash” I want to talk about is the “lost motion” in gear systems. It sometimes seems to rile people up alm...

INDUSTRY NEWS | 2016-12-20

Mitutoyo CNC Cylindricity Measuring System Boasts High Rotational Accuracy

Mitutoyo has announced the release of the RA-6000CNC, a custom-built CNC roundness/cylindricity measuring system with best-in-class accur...

GEAR TALK WITH CHUCK | 2016-11-22

Thanksgiving

I was going to reflect on how November 22, 1963 changed so many things, but decided it wasn’t an anniversary ending in a five or a zero and I would...

INDUSTRY NEWS | 2016-11-11

Rohm Cartridge Mandrel Offers High Accuracy for Internal Clamping

Rohm Products of America recently introduced the lightweight, compact Agilis power-operated cartridge mandrel clamping system. This new m...

INDUSTRY NEWS | 2016-09-19

Holroyd Tool Management Center Improves Accuracy and Repeatability of Milling Large Helical Rotors

A newly developed ‘large diameter' CNC cutter grinding machine from Holroyd Precision Ltd is designed to bring considerable adv...

PRODUCT NEWS | 2016-09-01

Product News

News on the latest products in the industry.

INDUSTRY NEWS | 2016-07-15

IMTS 2016 Tooling and Workholding Pavilion to Showcase Advances in Accuracy and Efficiency

Innovative machinery from around the world will be on display at IMTS - The International Manufacturing Technology Show. Key to maximizin...

FEATURE ARTICLES | 2016-03-01

Plastic Gearing Continues Converting the Unconverted

Plastic gears are everywhere today - throughout your car, at the oceans' lowest depths, in deep space. The question, when is a metal gear a candidate for plastic conversion, can be addressed in three words, i.e. what's the application?

INDUSTRY NEWS | 2015-09-30

Adcole Model 1310S Inline Camshaft Gage Features Sub-Micron Accuracy

Adcole Corporation recently introduced a new high-speed, fully automated end-of-line camshaft measuring machine that features sub-micron ...

GEAR TALK WITH CHUCK | 2015-07-21

A Long Hot Summer

We are having a bit of a heat wave in the Chicago area, not the deadly type of 1996, but uncomfortable for much outside activity. I marvel at the t...

GEAR TALK WITH CHUCK | 2015-07-09

Passion is a Good Thing

I wrote in my last post about the passion our technical experts feel for the gear trade. Passion, in my opinion, is an underappreciated factor in a...

INDUSTRY NEWS | 2015-07-06

Mitutoyo LEGEX 4 CNC Machine Provides High-Accuracy Measurements

Mitutoyo America Corporation recently released the latest LEGEX CNC coordinate measuring machine (CMM). The LEGEX 4 delivers accuracy in ...

TECHNICAL ARTICLES | 2015-07-01

I Like Big Gears and I Cannot Lie!

Many years ago, when asked how the five-meter gear was checked, the quality manager responded, “When they’re that big, they’re never bad!” That may have been the attitude and practice in the past, but it no longer serves the manufacturer nor the customer. Requirements have been evolving steadily, requiring gears to perform better and last longer.

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.

ADDENDUM | 2015-05-01

Henry Maudslay

Here is some history that bears repeating - or at least re-reading. So take a few minutes to give it up for a long-gone Brit named Henry Maudslay (August 22, 1771 - February 14, 1831) - also known as "A Founding Father of Machine Tool Technology." You might also consider him an early leader in inspection, as he also invented the first bench micrometer capable of measuring to one ten-thousandth of an inch.

FEATURE ARTICLES | 2015-01-01

Getting in Gear with the Chain of Innovations

At the dawn of the Industrial Revolution, so-called mechanics were tasked with devising the precise methods that would make mass production possible. The result was the first generation of machine tools, which in turn required improved tooling and production methods.

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.

GEAR TALK WITH CHUCK | 2014-10-07

Spamsters be Damned — We're Bloggin' Here

[starbox] The anticipated, two-way dialog for this blog has been hampered by persistent spammers trying to scam their way onto t...

GEAR TALK WITH CHUCK | 2014-09-02

Shared Responsibilities

[starbox] Coming off the Labor Day weekend, I had time to reflect on what the holiday means beyond marking the end of summer, retiring (for the ...

GEAR TALK WITH CHUCK | 2014-07-15

Our “Common” Language?

[starbox] Watching the World Cup final reminds me of that old adage about Americans and the English being divided by a common language. For exam...

EVENTS | 2014-06-01

AGMA Recognizes Member Achievements at Annual Meeting

The AGMA/ABMA Annual Meeting took place April 10-12 in St. Petersburg, Florida. Between committee meetings, networking opportunities and social events, many individuals in the gear industry were presented awards.

GEAR TALK WITH CHUCK | 2014-04-08

A Tool Looking for a Task?

[starbox] I have been hearing a lot about 3-D printing and how it will revolutionize manufacturing in the United States. Millions are slated to ...

INDUSTRY NEWS | 2014-03-01

GT Extras

GT Videos featuring R&P Metrology, the latest from our Twitter and LinkedIn feeds and an introduction to gearboxfailure.com

INDUSTRY NEWS | 2013-03-19

Renishaw System Tests Accuracy of Machine Tools

The new Renishaw XR20-W calibration system measures the angular position of rotary axes to within ±1 arc second, wirelessly, for t...

PRODUCT NEWS | 2013-01-01

Product News

The complete Product News section from the January/February 2013 issue of Gear Technology.

INDUSTRY NEWS | 2012-10-22

Mitutoyo CMM Brings Accuracy and Performance to In-line Applications

Mitutoyo America Corporation announces availability of the new MACH-3A CNC Coordinate Measuring Machine - a CMM that brings levels accura...

TECHNICAL ARTICLES | 2012-06-01

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.

TECHNICAL ARTICLES | 2012-06-01

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.

TECHNICAL ARTICLES | 2011-08-01

Manufacturing Method of Large-Sized Spiral Bevel Gears in Cyclo-Palloid System Using Multi-Axis Control and Multi-Tasking Machine Tool

In this article, the authors calculated the numerical coordinates on the tooth surfaces of spiral bevel gears and then modeled the tooth profiles using a 3-D CAD system. They then manufactured the large-sized spiral bevel gears based on a CAM process using multi-axis control and multi-tasking machine tooling. The real tooth surfaces were measured using a coordinate measuring machine and the tooth flank form errors were detected using the measured coordinates. Moreover, the gears were meshed with each other and the tooth contact patterns were investigated. As a result, the validity of this manufacturing method was confirmed.

TECHNICAL ARTICLES | 2010-11-01

Zerol Bevel Gears: Tribology Aspects in Angular Transmission Systems, Part III

Zerol bevel gears are the special case of spiral bevel gears with a spiral angle of 0°. They are manufactured in a single-indexing face milling process with large cutter diameters, an extra deep tooth profile and tapered tooth depth.

TECHNICAL ARTICLES | 2010-08-01

Crowning Techniques in Aerospace Actuation Gearing

One of the most effective methods in solving the edge loading problem due to excess misalignment and deflection in aerospace actuation gearing is to localize tooth-bearing contact by crowning the teeth. Irrespective of the applied load, if the misalignment and/or deflection are large enough to cause the contact area to reduce to zero, the stress becomes large enough to cause failure. The edge loading could cause the teeth to break or pit, but too much crowning may also cause the teeth to pit due to concentrated loading. In this paper, a proposed method to localize the contact bearing area and calculate the contact stress with crowning is presented and demonstrated on some real-life examples in aerospace actuation systems.

VOICES | 2008-07-01

Entrepreneurialism and Survival in the Global Market

Joe Arvin of Arrow Gear gives his insight on what it takes to succeed in today's gear industry.

INDUSTRY NEWS | 2007-11-02

ADCOLE Offers High-Speed Crankshaft Gage for Better Accuracy

A new high-speed, in-line, automatic crankshaft measurement gage for production environments that provides sub-micron accuracy has been i...

INDUSTRY NEWS | 2006-03-09

Ikona Gear Launches Oil and Gas Division, Signs Licensing Agreements

Ikona Gear launched Ikona Industries Corp. to focus on developing, manufacturing and shipping novel gearing applications for the oil and ...

PRODUCT NEWS | 2006-03-01

Shorter Cycle Times for Carburizing

Dana Corp. is developing a process that carburizes a straight bevel gear to a carbon content of 0.8% in 60 fewer minutes than atmosphere carburizing did with an identical straight bevel.

TECHNICAL ARTICLES | 2006-03-01

Detailed Computer Model of Gearbox Reduces Design Time

LMS International helped a Fiat subsidiary develop a new, dynamic vibro-acoustic prediction method to reduce design time and engineering costs through accurate prediction of gear noise in the design phase.

INDUSTRY NEWS | 2006-01-10

Mitsubishi Gear Technology Adds Holroyd Machine

Mitsubishi Gear Technology Center has added the Holroyd GTG2 precision helical grinding machine to its portfolio. Ian Shearing, vice p...

PRODUCT NEWS | 2005-07-01

Product News

The complete Product News from July/August 2005.

INDUSTRY NEWS | 2005-04-13

New North American Subsidiary for Atlanta GmbH

Atlanta GmbH in Bietingheim-Bissingen, Germany, announced the formation of its new North American subsidiary, Atlanta Drive Systems Inc.,...

INDUSTRY NEWS | 2004-04-02

Philadelphia Gear Hires Canadian Rep

Gaetan Perron was hired as the sales representative for established Philadelphia Gear customers in Canada and for prospects in eastern On...

TECHNICAL ARTICLES | 2004-03-01

New ANSI-AGMA Accuracy Standards for Gears

AGMA has started to replace its 2000-A88 standard for gear accuracy with a new series of documents based largely on ISO standards. The first of the replacement AGMA standards have been published with the remainder coming in about a year. After serving as a default accuracy specification for U.S. commerce in gear products for several decades, the material in AGMA 2000-A88 is now considered outdated and in need of comprehensive revision.

FEATURE ARTICLES | 2000-09-01

Gear Up for Performance: An Introduction to Synthetic Lubricants for Fractional Horespower Applications

Editor's Note: The following article details the advantages of synthetic lubricants in certain applications. However, the user should be aware of certain design issues arising from the extract chemistry of the synthetic. For example, some synthetics may have low solvency for additives. Others may not be compatible with mineral oils or nonmetallic components such as seals and paints. Some synthetics may absorb water and may not have the same corrosion resistance as mineral oils. Finally, the user should consider biodegradability or toxicity before switching to any new lubricant. Many of these concerns are present in petroleum-based lubricants as well, so consult a lubrication specialist before specifying a lubricant.

TECHNICAL ARTICLES | 2000-03-01

The Effect of Material Defects on Gear Perfomance - A Case Study

The quality of the material used for highly loaded critical gears is of primary importance in the achievement of their full potential. Unfortunately, the role which material defects play is not clearly understood by many gear designers. The mechanism by which failures occur due to material defects is often circuitous and not readily apparent. In general, however, failures associated with material defects show characteristics that point to the source of the underlying problem, the mechanism by which the failure initiated, and the manner in which it progressed to failure of the component.

FEATURE ARTICLES | 1998-05-01

AGMA and ISO Accuracy Standards

The American Gear Manufacturers Association (AGMA) is accredited by the American National Standards Institute (ANSI) to write all U.S. standards on gearing. However, in response to the growing interest in a global marketplace, AGMA became involved with the International Standards Organization (ISO) several years ago, first as an observer in the late 1970s and then as a participant, starting in the early 1980s. In 1993, AGMA became Secretariat (or administrator) for Technical Committee 60 of ISO, which administers ISO gear standards development.

TECHNICAL ARTICLES | 1996-09-01

Alternative Lubrication Methods for Large Open Gear Drives

The type of lubricant and the method of applying it to the tooth flanks of large open gears is very important from the point of view of lubrication technology and maintenance. When selecting the type of lubricant and the application method, it is important to check whether it is possible to feed the required lubricant quantity to the load-carrying tooth flanks, This is necessary to avoid deficient lubrication, damage to the gear and operational malfunctions. It is important to determine the type of lubricant, which may be fluid or grease-like. The consistency of the lubricant will have a direct impact on the ability of the lubrication system to feed adequately the lubricant to the gear. The interactions between the common types of lubricant and the lubrication application methods for open gear drives are shown in Fig. 1.

TECHNICAL ARTICLES | 1993-11-01

Hob Basics Part II

This is Part II of a two-part series on the basics of gear hobbing. Part I discussed selection of the correct type of hobbing operation, the design features of hobs and hob accuracy. This part will cover sharpening errors and finish hob design considerations.

TECHNICAL ARTICLES | 1993-09-01

Hob Basics Part I

The Hobbing Process The hobbing process involves a hob which is threaded with a lead and is rotated in conjunction with the gear blank at a ratio dependent upon the number of teeth to be cut. A single thread hob cutting a 40-tooth gear will make 40 revolutions for each revolution of the gear. The cutting action in hobbing is continuous, and the teeth are formed in one passage of the hob through the blank. See Fig. 1 for a drawing of a typical hob with some common nomenclature.

INDUSTRY NEWS | 1992-03-01

Our Experts Discuss Hobbing Ridges, Crooked Gear Teeth, and Crown Shaving

Question: When cutting worm gears with multiple lead stock hobs we find the surface is "ridged". What can be done to eliminate this appearance or is to unavoidable?

Accuracy

Gear Technology Associate Editor Alex Cannella sits down with Douglas Beerck of Gleason Metrology at IMTS 2018 to discuss the latest technology in inline laser gear inspection. This video is part of the Revolutions series on Gear Technology TV.

An overview of tactile and optical metrology