September/October 2018

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Feature Articles

Chamfering-Deburring Still a Player - Now More than Ever
Chamfering and deburring have been described as "unloved," a "necessary evil" and, in fact - "dead." After all, manual deburring is still common in many shops.

The Evolution of Gear Chamfering
The latest technological solutions help keep chamfering and deburring operations in-line -- often without increasing cycle times.

Deburring - The Underestimated Task
Deburring or chamfering of gear teeth is gaining attention in practical settings. And with a view to make the production sequence as efficient as possible, it is becoming increasingly important to be able to implement the deburring tasks directly on the cutting machine after spiral cutting.

Everything-Friendly Lubricants
Lubricant experts are doing more than ever to make their products less toxic and harmful to everything from the environment to the people using them — which comes with plenty of extra benefits for productivity, too!

Technical Articles

NVH Potential of PM Gears for Electrified Drivetrains
Electrification has already started to have a noticeable impact on the global automotive industry. As a result, the drivetrains of hybrid (HEV) and full electric vehicles (EV) are facing many challenges, like increased requirements for NVH in high speed e-Drives and the need for performance improvements to deal with recuperation requirements. Motivated by the positive validation results of surface densified manual transmission gears which are also applicable for dedicated hybrid transmissions (DHTs) like e-DCTs, GKN engineers have been looking for a more challenging application for PM gears within those areas.

Powder Metal Through the Process Steps
Powder metal (PM) gears normally sell due to the lower cost and their relatively high mechanical performance. The reason behind the lower cost is that most of the machining is omitted due to the net-shape forming process. So how net-shape are powder metal gears? In this article some hard-to-find information about the tolerances through the manufacturing steps will be presented.

First Part Right - Fiction or Reality
This paper analyzes the different influences of the deviations between nominal and actual geometry for a first-cut bevel gear. In each section, the customary tolerances are quantified and the possibilities to reduce them are discussed.

Influence of Different Manufacturing Processes on Properties of Surface-Densified PM Gears
The properties of both shot-peened and cold rolled PM gears are analyzed and compared. To quantify the effect of both manufacturing processes, the tooth root bending fatigue strength will be evaluated and compared to wrought gears.

Departments

We Hope You Enjoy(ed) the Show (Publishers Page)
IMTS 2018 was the biggest ever, no matter how you want to measure it. With 129,415 registrations, the show far surpassed the previous record of 121,764 set twenty years ago, in 1998. There were also more exhibiting companies (2,563) taking up more floor space (1,424,232 sq. ft.) than ever before.

Product News (Product News)
See the latest gear industry products from Marposs, GWJ Technology, Norton|Saint Gobain, Mitutoyo, C&B Machinery, DMG Mori, Gear Motions and LK Metrology.

Lubrication: Viscosity and Macropitting (Ask the Expert)
A reader asks: Is the ISO VG 320 adequate, or should a higher viscosity grade be used? How can we stop macropitting in gear teeth?

Calendar (Events)
The complete technical calendar from the September/October 2018 issue of Gear Technology.

Industry News (Industry News)
Liebherr and Wenzel announce sales and service agreement; MPIF releases new powder metal standard; Gear Motions announces promotions; Profilator opens new factory and more gear industry news.

Introducing Revolutions (Addendum)
The new series of videos from Gear Technology TV brings you technology insight from leading experts in the gear industry.