Articles About Racks


Cost Effective High Precision Linear & Rotary Axes

Andantex, USA, a member of the Redex-Group, offers modular system building blocks consisting of Hardened & Ground Racks, High Quality Planetary Reducers including Output pinions, Ring Gears and Automatic lubrication systems to build linear axes of any length and move weights from 100 to 200,000 Lbs. White Paper Courtesy of Andantex USA

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1 Premature Bearing Failures in Wind Gearboxes and White Etching Cracks (October 2014)

Wind turbine gearboxes are subjected to a wide variety of operating conditions, some of which may push the bearings beyond their limits. Damage may be done to the bearings, resulting in a specific premature failure mode known as white etching cracks (WEC), sometimes called brittle, short-life, early, abnormal or white structured flaking (WSF). Measures to make the bearings more robust in these operating conditions are discussed in this article.

2 Investigations of Bearing Failures Associated with White Etching Areas (WEAs) in Wind Turbine Gearboxes (March 2014)

A critical problem for wind turbine gearboxes is failure of rolling element bearings where axial cracks form on the inner rings. This article presents field experience from operating wind turbines that compares the performance of through-hardened and carburized materials. It reveals that through-hardened bearings develop WEA/WECs and fail with axial cracks, whereas carburized bearings do not. The field experience further shows that a carburized bearing with a core having low carbon content, high nickel content, greater compressive residual stresses, and a higher amount of retained austenite provides higher fracture resistance and makes carburized bearings more durable than through-hardened bearings in the wind turbine environment.

3 Rolling Bearings in High-Speed Passenger Traffic (June 2012)

Passenger transport today moves significantly faster than ever before, often operating on separate tracks especially designed for high-speed trains. Accordingly, high-speed rolling bearings are very important components in the bogies of trains today. Maximum train speeds currently reach 380 km/h (236 mph) in the latest high-speed applications - 80% higher than in the earlier days of high-speed traffic. This paper presents two application examples of modern, high-speed traffic, together with some typical bearing arrangements and housings. It provides insight regarding measures taken in the bearing industry to meet the requirements of contemporary, high-speed traffic, and it cites important standards and regulations applicable for - but not restricted to - European applications. To be precise, the focus here is on journal bearings; information on traction motor bearings, transmission bearings and housings is included, but described in less detail.

News Items About Racks

1 Gear Racks, Metric Precision Ground Racks-NEW (July 12, 2007)
A NEW series of ISO class 5 rectangular Ground Racks. Gear racks are used to convert rotational motion into linear motion. In theory, a r...

2 Stock Drive’s New Molded Racks Offer Extension Possibilities (April 16, 2006)
A new series of four flexible molded racks introduced by Stock Drive Products can run with standard 20 degree pressure angle metric gears...

3 Flexible Molded Duracon and Steel Racks (July 12, 2007)
A new series of 7 flexible molded Duracon and steel racks  introduced by Quality Transmission Components can run with standard ...

4 Nexen Group Versa Rack an Alternative to Traditional Metal Racks (July 6, 2015)
Nexen Group, Inc. recently introduced the Versa thermoplastic rack – an alternative to traditional metal racks that are design...

5 Nexen Expands RPS with Steel Racks (July 3, 2013)
Nexen Group, Inc., has expanded its offering of the Roller Pinion System (RPS) by adding a full line of stainless steel racks. The RPS is...