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Gear Heat Treatment Selection with a Duty Test Matrix

A practical framework for matching requirements to process routes and proof tests

Heat treatment decisions for gears are often reduced to a surface hardness number. That shortcut can work for mild duty, but it frequently breaks down when contact fatigue, scuffing risk, shock events, distortion limits, or finishing constraints become dominant. Many late-stage issues trace back to the same pattern: the duty case is incompletely defined, the process window is underestimated, or verification confirms “a number” without proving the full property profile.

Profile Grinding of Large Gears

Increasing material removal efficiency through advanced infeed strategies

High-Volume Holemaking for Gear Production Success

Consider exchangeable-tip solid round cutting tools for durability, precision, and performance

Drivetrain Integration

Flender unveils the next generation of wind gearboxes

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Technical Articles

The Intrinsic Pitch Cones in Hypoid Gears

A method to calculate pitch cones for hypoid gears using macrogeometry parameters—similar to non-offset bevel gears—while accounting for the added complexity of hypoid offset, tooling, and cutting technology is explored in this paper.

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Water Spray Quenching—A New Intensive Quenching Process for Case Hardening of Gears

Water spray quenching achieves heat transfer coefficients up to 4,000 W/(m²K)—nearly double conventional oil quenching rates—enabling potential material substitution and tailored quench intensity for complex gear components.

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Prospects of Asymmetric Gears in EV Gearbox

The paper examines how optimizing asymmetric gear tooth geometry through Direct Gear Design can improve load capacity, efficiency, and compactness in EV gearboxes, surpassing the performance limits of conventional symmetric gears.

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A Review on Gear Transmission Error

This paper will review the development process, current research status, characteristics, functions, and measurement methods of TE. It will analyze the difficulties and core issues existing in the basic theory of TE, clarify the limitations and deficiencies of TE, and explore ways to overcome the shortcomings of TE.

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Design

Mechanical power loss in gears is generated through sliding and rolling of the contact resulting in frictional work and elastic hysteresis generation of heat. This action is both a parasitic loss of energy from the drivetrain and a source of engineering costs to control system temperature to avoid heat-related failures of the gearbox components. Therefore, from both a cost and durability standpoint it is of great interest to minimize the frictional losses at the gear tooth contact interface.

Grinding

This article describes a cloud-based process and machine component monitoring system called ARGUS. The term “swarm” is used for a large population of gear-grinding machines of individual and independent customers connected to the ARGUS system and the ARGUS cloud. These “swarm” machines permanently feed their anonymized process data into a common cloud database. Reishauer uses this database for big data analytics to discover patterns that indicate successful process and machine component behavior patterns worth integrating into the ARGUS algorithms and propagate them across the complete ARGUS customer base.

Inspection

In conventional gear manufacturing, quality control is carried out for a number of pieces per batch. Most parts enter final gearbox assembly without any inspection. Among other things, this approach is based on two facts: measuring time is significantly longer than the machining time, and the limited measuring capacity available.

Heat Treating

Various in-situ methods can track realtime heat treatment response in bulk materials. This can aid material engineers in designing the most effective heat treatment procedures and processing methods. In-situ  methods such as thermogravimetry (TG), differential thermal analysis (DTA), and dilatometry, offer capabilities to examine heat treatment behavior in real time, giving insight into the thermochemical mechanisms and the thermal behavior of steel.

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Videos

Helios Gear Helps American Precision Gear Achieve Quality and Productivity

At American Precision Gear, quality isn’t just a priority — it’s the foundation of everything they do. The shop specializes in high-precision miniature gears for aerospace, defense, and medical applications, where the strictest tolerances are non-negotiable. Helios Gear Products partnered with American Precision Gear to integrate the MZ 1000 D-Drive into their production.

Industry News

GenNx360 Capital Partners, a New York-based private equity firm focused on investing in middle-market industrial and business services companies, today announced that its portfolio company, Horsburgh & Scott, has acquired Franklin Machine & Gear, a provider of industrial gear and gearbox repair and replacement services.

Product News

FVA-Workbench 11.0.0 is now available. This manufacturer-neutral simulation platform for modeling, parameterization, and calculation of transmission systems has been enhanced with numerous new features.

Calendar

The Manufacturing Engineering Division (MED) of ASME sponsors the Manufacturing Science and Engineering Conference (MSEC) every June. MSEC (State College, PA) is the annual forum for the exchange of advanced manufacturing research knowledge. It is intended to disseminate the most recent developments in manufacturing research through technical presentations, poster sessions and panel sessions. The event is hosted by Penn State University.

GrindingHub 2026

May 5, 2026 - May 8, 2026

Gear Up for Precision Open House

Jun 9, 2026 - Jun 10, 2026

WZL Gear Conference USA

Jul 15, 2026 - Jul 16, 2026

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