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NSK offers DIN standard ball screws from stock

NSK has developed a new series of standard ball screws that fully conform to the DIN international standard. This range of ball screws will be available from stock when they are officially launched into the European market in February 2016, which will minimise lead-times for many OEM customers. In addition to offering made-to-order ball screws to meet various customer demands, NSK was one of the first companies to introduce standard, off-the-shelf stock ball screws to the market.Designed for compactness and dimensional compatibility, the ball nut dimensions of the new range are manufactured in accordance with DIN69051-5. Potential applications for these ball screws are wide ranging, and include such applications as machine tools, automotive manufacturing equipment and semiconductor manufacturing equipment.

In total, NSK will offer 11 different models and 33 types of DIN standard ball screws from stock, having shaft diameters ranging from 20 to 50 mm, leads from 5 to 20 mm and total lengths ranging from 700 up to 2800 mm. With regard to specification, NSK DIN standard ball screws offers a DN maximum value of 150,000 and 160,000, a precision class of JIS Cp5 (better than ISO P5), P (oversize ball) preload type, and either end deflector type or bridge deflector type circulation methods.

The major benefit to OEMs of stock availability is a short lead-time. By leaving the shaft end un-machined, NSK has the capability to finish-machine the shaft end locally in line with customer specific requirements. To further help OEMs reduce time-to-market. NSK provides the high performance X1 seal, which is popular for machine tools, and the NSK K1 lubrication unit as optional parts. In this way, NSK is able to provide additional functionality to the ball screws in order to meet the needs of customer applications. High performance X1 seal: Double functions with highly dustproof and superior grease retention NSK K1 lubrication unit: Self-lubrication for longer maintenance-free performance. NSK can also offer a range of high precision ball screw support bearings and Linear Guides from stock, along with other optional components such as seals and lubrication units.

NSK in profile
Established almost 100 years ago, NSK (Nippon Seiko Kabushiki Kaisha) is a Japanese-listed company that has evolved from a regional ball bearing supplier to a roller bearing specialist and automotive supplier with a global market presence. Today, NSK employs more than 30,500 employees in 29 countries. As per March 2014 NSK achieved a turnover of 6,2 billion Euros. This result has been driven by ever-increasing investment in research & development, enabling the company to continuously improve the quality of its products and services. This investment supports NSK's objective of "No. 1 in Total Quality". In addition to a complete rolling bearing portfolio, NSK develops and manufactures precision components and mechatronic products, as well as systems and components for the automotive industry, including wheel bearing units and electric power-steering systems.

In 1963, NSK's first European subsidiary, Düsseldorf, Germany, was opened and in 1976, the first European production facility in Peterlee, England. Today, NSK Europe supports pan-European sales with production locations in England, Poland and Germany, logistics centres in the Netherlands, Germany and England and technology centres in Germany, England and Poland. In 1990, NSK purchased the UPI Group including the renowned European bearing manufacturer RHP, with its factory in Newark (UK). Additionally, NSK has developed a comprehensive network of authorised sales distributors. NSK Europe is divided into application-based business divisions: Industry rolling bearing technologies & linear and precision technology (EIBU) as well as bearing modules and steering systems for the automotive industry (EABU & ESBU). In this organisation, NSK Europe's 3,500 employees achieved a turnover of over 900 million Euros as per March 2014.

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NSK training boosts bearing knowledge at Gilkes

Gilbert Gilkes & Gordon Ltd (Gilkes), a manufacturer of hydroelectric turbines, engine cooling pumps and industrial pumps, has enhanced its bearing knowledge with a short training course delivered by experts from NSK. Comprising part-theory, part-practical content, the two half-day training sessions were tailored to the specific requirements of Gilkes, helping the company's engineers improve their understanding of the latest motion technologies. Employing over 200 people at its Kendal headquarters, Gilkes has a history in engineering innovation that dates back more than 160 years. Although the company's hydro products and pumps are renowned in markets around the world, with an ethos of continuous improvement this forward-thinking business opted for a short training course on bearings following a routine meeting with NSK.

"Gilkes have been a customer of ours since the 1980s, and it was during a courtesy visit that the topic of training arose," explains Andrew Fletcher, Applications Engineer at NSK´s European Industrial Business Unit. "We discussed the NSK training portfolio and Gilkes expressed keen interest."

Products manufactured by Gilkes use an array of NSK deep groove ball bearings, cylindrical roller bearings and double row angular contact bearings. However, conscious of its shortfall in bearing knowledge, the company immediately took up NSK´s training offer.

The two training sessions were delivered at the company's Kendal facility to a total of 14 participants, a cross-section of senior design engineers, production engineers, maintenance engineers and apprentices. Importantly, the attendees were asked to come up with 10 questions about bearings that they wanted the course to answer.

"During the course we covered the answers to the 10 questions in detail," says Mr Fletcher. "As a result, Gilkes got exactly what they needed from the training, plus a host of additional information that will hopefully prove extremely useful."

The course included sessions on bearing types and characteristics, different bearing sealing arrangements, internal clearances, lubrication, bearing failure modes and a host of additional topics. To help maximise engagement levels, the course also included an informal practical element whereby the attendees were asked to build a bearing unit against the clock to see who could do it the quickest.

"The engineers from Gilkes were enthusiastic and showed a real desire to learn," says Mr Fletcher. "We often deliver courses of this type to aftermarket customers, so it was refreshing to provide the same benefits to an OEM. We think more OEMs would do well to seek out training on the bearings they use in their machines and equipment as it presents a real opportunity to update their existing knowledge and practical skills. This is boosted by the fact that each course can be tailored to the individual requirements of the customer."

Gilkes is now in the process of considering a level II course for a further 10 engineers. Level II courses cover bearing technology in more detail, featuring topics such as calculation training.

NSK offers a wide range of bearing solutions for pump applications. For instance, standard cylindrical roller bearings with either brass, steel or polyamide cages are used extensively in centrifugal, piston, submersible and LNG (liquefied natural gas) pumps, to list but a few. Also popular among pump manufacturers are both high capacity and creep-free types of deep groove ball bearings. The latter are used commonly to facilitate pump motor shaft rotation, for example, where O-ring compression prevents unwanted creep.

Similarly, angular contact ball bearings are another popular pick for pump design engineers, thanks principally to attributes such as high load capacity, rotating speed and precision, but also factors like universal matching and tight axial clearance/preload tolerance.

For further information, the NSK ´Bearings for Pumps and Compressors´ catalogue can be accessed at: Alternatively, a hard copy can be requested by calling +44 (0)500 232746.

Free booklet explains bearing designation systems

A compact, 48-page booklet has been published by NSK that explains bearing designations in concise and clear terms, thus making it easier for engineers to choose bearings and order spare parts.Designations, which are typically laser marked or stamped on to bearings, provide details about the specific bearing type along with attributes such as bore size, internal clearance, tolerance class, heat treatment, seal type and quantity of grease. However, this code is only of use if it can be deciphered.

In direct response to customer feedback, NSK has published a convenient, paperback-sized booklet that simplifies the most common designations used for NSK and RHP bearings.

The free publication begins by explaining how bearing order codes are constructed before defining the designations in transparent and elementary terms. Subsequently, the booklet examines NSK's own system of prefixes and suffixes, before concluding with a handy table that cross-references both NSK and RHP designations with those deployed by other bearing manufacturers.

Ultimately, this must-have booklet makes it easier than ever before for engineers to identify precise bearing designs and specifications based on the order code printed on the packaging and the component. At last, bearing designations demystified!

For further information, view website: 
Refer to page 823

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