Home Archives


May 2019

Stace-Allen Chucks

Although it started out manufacturing precision power chucks, Stace-Allen Chucks has expanded into workholding – designing and manufacturing custom solutions to meet its customers’ demands.

Stace-Allen Chucks has been designing and manufacturing chucks for more than 70 years, but the company is so much more than that. “We are a highly specialized workholding company,” said Phil Grimes, president of Stace-Allen Chucks. “We have an engineering department, and we design specialty workholding. We still do our chucks; we still do our […]
Kenneth Carter

Residual Stresses in Case Hardened Steel Gears

Gears machined from forged billet and as-received bar develop tensile residual stress in the core of the gear following full heat treatment.

Aerospace gear components are required to demonstrate excellent load-carrying and endurance characteristics. Case-hardened steels are often used for these parts. During the manufacturing process of case-hardened steel gears, residual stresses are developed. The nature and distribution of these stresses are known to have a significant effect on distortion during heat treatment and machining processes. The […]
David Easton, Salah Rahimi, Chris Aylott, Brian Shaw

Choosing the proper grinding wheel

Experts with Norton | Saint-Gobain Abrasives discuss the challenges of gear grinding and how advances in technology are improving the efficiency of grinding methods.

Methods of gear grinding have changed over the years. As manufacturing standards get tighter, the right machines and abrasives needed to meet specifications have become even more critical. Product Manager Josh Fairley and Senior Application Engineer Phil Plainte with Norton | Saint-Gobain Abrasives share their expertise on how gear grinding — as well as using the […]
Kenneth Carter

Why are Today’s Hypoids the Perfect Crossed-Axes Gear Pairs?

Gear scientists, gear engineers, and gear manufacturers have worked successfully for many decades on finding the optimal flank forms and the optimal non-conjugate flank surface interaction.

In 1924, Ernest Wildhaber, a well-known gear scientist, invented hypoid gearing. Compared to spiral bevel gears, hypoid gears provide an offset that allows lowering of the body of rear wheel drive vehicles by 50mm or more. This is possible because the propeller shaft between engine/transmission and the driving axle is not positioned at the center […]
Dr. Hermann J. Stadtfeld

April 2019

Weiler Abrasives

With a history that dates back more than century, Weiler Abrasives has become a global market leader in abrasives, delivering innovative solutions to customers in targeted end markets.

Weiler Abrasives has worn many hats dating back to its original roots in 1898, but gear grinding has become one of the company’s key initiatives. “We chose gear grinding for several reasons,” said TJ Boudreau, category manager with Weiler Abrasives. “Our unique vitrified technology gives our gear-grinding products significant advantages. Additionally, it complements our technical […]
Kenneth Carter

Increasing Static Friction with Laser

High static friction is important for improving safety and reducing costs.

Flat and curved surfaces with functionality of high static friction are increasingly needed for force-fitted nonslip power transmissions. The motivation is driven by the desire to have a higher safety of function and further cost reductions in manufacturing. Expensive solutions such as diamond layers, diamond coatings, or form-fitting design are increasingly being substituted. A modified […]
Gerhard Flores

Hydraulic workholding takes hold

New Gleason hydraulic workholding solutions are becoming an attractive alternative to traditional mechanical systems in an increasingly wide range of gear-manufacturing applications.

In the brave new world of smart factories, Internet 4.0 and highly automated machines and cells, workholding rarely gets top billing. It’s surprising that workholding gets so little attention, given the profound impact it can have on reducing cycle times, scrap, and ultimately, cost per workpiece. Fortunately, most gear manufacturers in recent years have begun […]
Peter Harrison

Still Stuck with Hand Deburring?

With hand deburring, consistent quality and steady volume are vital concerns.

No blueprint ever revealed, nor engineer ever designed, a part with burrs. It is only after a process is selected for making a part that the burring issues become obvious. Veteran designers have learned that even when a deburring process is planned, chances are high that additional burr developments will come to light needing more […]
Wayne Moore

March 2019

General Broach Company

When it comes to broaching, General Broach Company is able to find the best machine and best tool design to fit the customer’s need.

General Broach Company General Manager Larry Stover freely admits that “broachable” isn’t a word, but it still sums up what the company is all about. “We are going to provide a quality product that is going to lower the cost per part,” Stover said. “We specialize in pot broaching especially. I know a lot of […]
Kenneth Carter

Industrial gear lubricants face formulation challenges

Moisture, temperature, viscosity, filtration, and base oil are some of the factors that need to be considered.

Gears transmit motion from one shaft to another or from a rotating shaft to a reciprocating element. Gears transmit power, change speed, change force (torque) or change direction. They operate under a myriad of operating cycles, loads, speeds and temperatures (see Gear Basic Terminology below). Gear lubricants increase the durability of equipment by preventing gear […]
Lawrence Ludwig Jr., Nancy McGuire

Advantages of a dual-screw H-Frame broaching machine

The BMS Dual-Drive is an electromechanically powered, table-up vertical broaching machine for all types of internal broaching applications.

Like any industry, in the machine-tool industry, the needs of the market drive new designs and the development of new technologies. Naturally, everyone wants machines to be less expensive to operate, to require less maintenance, and to be easier and safer to operate. They want a machine to take up less floor space and to […]
Matt Egrin

Streamlining safety for high-speed/small-footprint milling machines

High torque retention knobs are a vital anchor for safety between machine and spindle for high-RPM mills.

Safety in design is critical to CNC milling operations end products as well as to the machine’s profitability. As the trajectory of today’s new milling technology trends toward machines producing extremely high speeds/high-RPM within a smaller overall foot print, potential safety issues can’t be ignored. Loose tools moving fast could present the potential for a […]
John Stoneback

February 2019


Marposs has become a global leader for the supply of high-precision equipment for inspection, measurement, and control in the production environment.

In order to maintain its position as a world leader in the field of high-precision equipment for measurement, Marposs always looks for the right blend between experience and innovation. “Our mission is mainly to provide high-precision metrology equipment for machine control and part inspection in the shop floor environment,” said Matteo Zoin, senior manager, head […]
Kenneth Carter

Integrating Non-Contact Metrology in the Process of Analysis and Simulation of Gear Drives

The application of non-contact metrology allows a very fast collection of points on the measured gear-tooth surfaces with data rates that can be as high as millions of points per second — this new technology provides a wealth of information on gear geometry.

Speed and accuracy are critical factors for gear inspection. The faster the inspection process, the larger number of gear units can be inspected. The accuracy of the inspection process also plays a fundamental role to identify any possible defect in the production line and before the gearbox is assembled and further tested. The technology of […]
Alfonso Fuentes-Aznar, Ignacio Gonzalez-Perez

Design features of perfect gears for crossed-axes gear pairs

To improve the accuracy and performance of gears that operate on crossing axes of rotation, gears should be designed so they align to the three fundamental laws of gearing.

Gearings that operate on crossing axes of rotation of a gear and a mating pinion have been known for centuries. Common sense and accumulated practical experience are the two foundations for the adopted practice of designing gears in ancient times. Such a practice was permissible as the input and output rotations at that time were […]
Dr. Stephen P. Radzevich Ph.D., Dr. (Eng) Sci.

January 2019

Precision Gage Company

After 70 years, Precision Gage Company brings quality gear inspection to the industry, whether it be dimension-over-wires gages or fully-automated dual-flank composite test systems.

It’s a testament to Precision Gage Company that, from its beginnings in a living room in Chicago, it is celebrating its 70th year in the industry this year. Precision Gage has prospered by offering common-sense inspection solutions for manufacturing, especially with regard to gear inspection, according to RG Layland, director of business development for Precision […]
Kenneth Carter

Magnetic Barkhausen Noise as an Alternative to Nital Etch for the Detection of Grind Temper on Gears

MBN is quantitative, repeatable, non-destructive, and it is easily automated, thus removing operator influence as a variable.

The detection and prevention of grinding burn is critical to the production of ground gears of all types and sizes. Overheating during grinding, or grind temper, results in undesirable microstructure, hardness, and stress characteristics both on and below the surface. These characteristics result in failure modes on precision surfaces, which typically require high performance under […]
James Thomas, Stephen Kendrish

Grading the strength of steel

Newly developed high-strength steel for car powertrain and transmission components includes three grades – knowing the difference will help you meet your quality goals.

Vehicle manufacturers are faced with a difficult task of significantly improving fuel economy and safety while maintaining competitive position in the market. This can be accomplished, among other things, by using higher strength steel for car and truck. Newly developed high strength steel for car powertrain and transmission components (GEAR-Steel) can help accomplish just that. […]
Gregory Vartanov

Measuring Tooth Flank Roughness

The Contact Stylus Profilometer provides a pragmatic, accurate and reproducible tooth flank roughness measurement.

Gear performance has continuously increased over the past two decades. Improvements in metals, heat treatments, geometry, and lubrication are just a few of the sources of these improvements. For gears operating in high load, EHL-type conditions, tooth flank finishes have experienced a similar improvement trend. These tooth flank finish improvements minimize the risk of surface […]
Mark Michaud