NSK replaces spindle bearings on large surface wheel lathe

The Doppelmayr Graventa Group in Wolfurt, Austria, a specialist in the manufacture of surface and aerial ropeways, has benefited from the expertise of NSK in replacing the main spindle roller bearings on an extremely large surface wheel lathe. Due to the lathe’s age and the obsolescence of the spindle assembly, the project entailed a significant amount of reverse engineering, supported by the team at NSK, before double row cylindrical roller bearings were specified for the central bearing positions. Due to the global rise in demand for ropeways, which are seen as an economic and rapid alternative to conventional ground transport in both inaccessible and highly urban landscapes, business at the Doppelmayr/Garaventa Group has seen the manufacture of more than 14,600 ropeway systems for customers in 89 countries to date. The company makes all of the required components for its ropeways in-house, including the large sheaves at the top and bottom stations which guide the main drive cable. The bearing surface of the sheaves must be manufactured with very high precision to ensure smooth operation and secure cable guidance.   The sheaves are machined on a large surface wheel lathe that was rebuilt from an original longitudinal lathe produced many years ago by Zerbt. Although the machine, which has a face plate weighing 30 tonnes, gives good service, Doppelmayr faced a challenge when wear and tear dictated that the main spindle’s roller bearings required replacement. The principal problem in replacing the bearings related to the machine’s age and the fact that the original manufacturer had changed ownership. This meant there was no documentation relating to the main spindle assembly. For...

High speed trains use high performance NSK bearings

Helping facilitate high speed train travel in Japan, NSK says that its high performance axle, motor and drive unit bearings have been selected for a prestigious new rail project. The bearings have been specified for the H5 rolling stock to be deployed on the Hokkaido Shinkansen high speed rail line being constructed between Shin-Aomori and Sapporo – the initial section of which is due to open in March 2016. Safety and reliability are paramount considerations on all rail projects, but especially on ultra-high speed trains where speeds of circa 320 kph (200 mph) are typical. With this in mind, nothing but the highest performance bearings will suffice. As a result, Hokkaido Railway Company selected a range of bearings from NSK designed specifically to withstand the demands and challenges of high speed motion. For example, NSK’s oil bath, double-row cylindrical roller bearing were chosen for the axles, a product that can facilitate high speed rotation while generating very little heat. The principal benefit for the user is extended service life, which is vital for long distance, high speed rail travel. Also selected were ceramic-coated insulated bearings for the main traction motors. The proven safety record and lightness of these bearings will boost reliability and help prevent electrical pitting on the rolling surface, which is a known threat to bearing life. For the drive units, which are subjected to considerable vibration, the NSK bearings chosen by Hokkaido feature high strength cages that have been subjected to nitriding treatment to enhance shock resistance. Ultimately, NSK was the preferred bearing manufacturer selected because of the rigorous quality measures that are imparted to ensure...

Designing with Ceramic Bearings

Do you know when and why to use ceramic bearings? You’re about to: Erick Sloan from Carter Manufacturing Limited writes an Engineer’s guide to design using ceramic bearings. It is very important to understand the advantages and disadvantages of ceramic bearings before designing them into your application. This article will highlight the pros and cons, outline the common ceramic bearing materials and touch upon a few of the endless applications in the field today. Advantages: Ceramic microstructures enjoy covalent bonding inherent between non-metal elements. This means they share electrons. This atomic co-operation yields a very strong attraction force and because of this, ceramics offer a series of benefits in comparison to metals. They normally have a very high hardness (70-90 HRc) and elastic, or Young’s, modulus. This means they are resistant to shape change when loads are applied along with improved wear characteristics. Ceramic bearings can run lubrication free. This is because ceramic materials don’t micro-weld. Micro-welding happens, typically with metals, when the surface imperfections on the rolling element and raceway interact with one another causing an electric arc. This degrades the surface and substantially reduces the bearing life. Ceramic materials do not have this issue which makes them suitable for various applications which require a lube-free environment. They usually behave in a stable manner at high temperatures meaning there is less thermal expansion. It takes a great deal more energy to increase the bond length of a covalent bond in comparison to a metallic ionic bond. Ceramics are non-metallic, nonferrous materials. They don’t corrode in the same way as metals when exposed to water and other hazardous chemicals....
Schaeffler launches new X-life range of high performance toroidal rolling bearings

Schaeffler launches new X-life range of high performance toroidal rolling bearings

Precision bearing manufacturer Schaeffler (UK) Ltd has launched a range of high performance toroidal rolling bearings with angular adjustment capability, which provide high operational reliability, even under heavy loads. The FAG TORB range of toroidal rolling bearings is manufactured to Schaeffler’s premium quality X-life standard. The bearings are single row rolling bearings with long, slightly spherical rollers, enabling the FAG TORB to combine the angular adjustment capabilities of a spherical roller bearing with the axial displacement capabilities of a cylindrical or needle roller bearing. This means the bearings are suitable for a variety of industrial applications, including steel rolling mills (e.g. continuous casting plants), belt and conveyor systems, paper machines (e.g. drying cylinders), marine drives, turbomachinery used in power generation (e.g. ventilators), textile machines, crushers, food processing machines, and agricultural machinery. FAG TORB toroidal rolling bearings are available in two versions: as full complement bearings or as a caged version. When the design envelope is restricted, the caged bearing provides very high radial load carrying capacity, even when skewing or axial displacements need to be compensated for. The full complement bearing offers a particularly high load carrying capacity. More than double the operating life FAG TORB bearings allow the operational reliability and cost-effectiveness of locating/non-locating bearing supports to be significantly increased. Temperature-related linear expansion and misalignments mean that non-locating bearing designs are particularly important. FAG TORB bearings are the perfect non-locating bearing for use in combination with a spherical roller bearing as the locating bearing, allowing either higher load ratings or a smaller design envelope to be achieved compared to conventional locating/non-locating bearing arrangements. FAG TORB toroidal rolling bearings...
Industria Bearings secures exclusive GMN Distributorship for the UK

Industria Bearings secures exclusive GMN Distributorship for the UK

Uxbridge based Industria Bearings & Transmissions has confirmed it has been appointed as exclusive distributors of GMN high precision products for the UK. Products include the brand new GMN CF seal, which has been designed specifically for use on spindle bearings, the full range of non-contact seals – including labyrinth and gap seals, as well as sprag type clutches in both freewheel and ball bearing formats. Roy Thomason, Managing Director for Industria Bearings & Transmissions, said: “We have been awarded this prestigious distributorship due to our reputation for being the ‘distributors’ distributor’, which is due to our widely recognised expertise with all types of bearing projects and this in turn is testament to our highly knowledgeable team and their hard work. “We have been working with GMN for a number of years now and this latest development will no doubt further strengthen our relationship. We look forward to working with GMN to champion their products in the UK and to developing what we anticipate will be a highly successful and mutually beneficial arrangement.” Jens Igelhaut of GMN said: “It is important for our company to have strong representation from a technically skilled and knowledgeable, trusted partner, not only from our side but from our UK customers’ standpoint. “Knowing and working with the Industria Bearings team for many years has established this high level of trusted relationship and we have every confidence that GMN products are going to be very well represented in the all important British bearings market moving forward.”...
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The one leading voice for the Fluid & Power Transmission Industry - Saturday, December 16th 2017
****ISSUE 81 - DEADLINE DATES - EDITORIAL & PICS 10/11 - ADVERTISING A/W 17/11 -PUBLICATION DATE W/C 13/12****