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How Water Jet Sweden T-model manage to counteract the laws of physics.

Waterjet technology is unique cutting method using natural elements like water, sand and pressure. No heat or chemical substances are being added and no poisonous fumes are created. Natural elements, yes, but these forces must be controlled and is a tough environment for man-made machines. How to build a long-life, high performance waterjet machine starts with some basic design principles. We went into the production hall of world leading waterjet manufacturer Water Jet Sweden to check behind the curtains building the entry level T-model machine.

Heavy-duty steel frame.

To cut heavy materials with a more than 0.1 mm accuracy consistently year after year demands a heavy duty machine design that can manage weight and withstand vibrations over time. The weight of the steel frame ensures machine stability. If you select wrong material or too weak sections on the frame design it can cost a lot in performance. You can easily see the difference if you lift off the cover panels of a waterjet cutting machine.  The massive steel beams of the T-model are designed to consistently withstand vibrations and delicately operate heavy cutting tools and accessories for many years. 

2017 04 19 094045A production hall of Water Jet Sweding in Ronneby building a new batch of T-model entry level waterjet cutting machines.

Complete protection of Moving Parts

Water jet cutting is environmentally friendly cutting method, but it is a tough environment for high tech machines. Many parts are sensitive to the wear of abrasive and water and easy maintenance is key to performance and lifetime.  On the T-model the motion systems are enclosed with full covered bellow protection. This keeps mechanical and electrical parts clean from the abrasive and water while processing and the machine is very easy to clean. Protection of sensitive parts and easy cleaning will secure machine performance, simplify maintenance and significantly prolong machine lifetime. 

Powerful, waterjet optimized, motion system

The motion system of a water jet cutting table must withstand torsion powers, often several hundred kilograms, and at the same time have a smooth movement to keep accuracy and tolerances at tenths of a millimeter. The ballscrew for the X and Y axis is one example for how the T-model motion system is specially designed for water jet cutting. The powerful ballscrew of 32 mm in diameter makes the T-model waterjet machine able manage higher rotation speed. This minimize the risk of wobbling and torsion and secure uptime and lifetime performance. 

Generally, the ballscrew of a Water Jet Sweden machines has quite a low pitch (20 mm/turn). This will give a smooth movement with high resolution and accuracy when cutting. The pitch affect maximum speed, but a maximum cutting speed of 10 000 mm/min (X and Y axis) is more than enough for water jet cutting.  Maximum travel speed (15 000 mm/min I Y and 15 000 mm/min in X) is a more academic figure since travel time normally is a very small part of total processing time.

Choice of motion system guide rails are also important. You must have a stable and straight X and Y axis movement to get consistent cutting quality. Otherwise it is almost impossible to keep accuracy and tolerance measures while cutting. But that’s what a wide and stable guide rail gives you.  For small extra cost the wide guide rails improve machine performance and prolong machine lifetime. The T-model has two wide guide rails on the Y-axis where the main is 90 mm and support 35 mm. The X-axis beam has a stable 70 mm guide rail to make the Z-unit travel steadily. Our broad guide rails resist torsion, unnecessary tension and gives a consistent cutting quality, hour after hour, year after year. 

These are a few examples of mechanical design that enables the five-year performance warranty. Machines built by waterjet specialist in Ronneby, Sweden, devoted to performance.

About Water Jet Sweden AB

A successful pursuit of measurable customer benefits
Back in 1993, we produced our Machines in a private garage. Today we serve customers in more than 40 countries. Our native town of Ronneby in southern Sweden has become a R & D cluster of global renown, where the scientific establishment, the water jet industry and the business community join efforts to develop the water jet cutting technology of tomorrow.

Our ultimate end product is customer value, and the benefits our machines and service can offer are highly measurable in terms of time, money, product quality and sustainability.

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High performance seal option now available on an extended range of SKF Explorer deep groove ball bearings

Applications requiring larger bearing sizes can now benefit from longer maintenance intervals and greater resistance to contamination.

Gothenburg, Sweden, 13 March 2017: SKF is making its high performance RSH seal design available on a larger range of SKF Explorer deep groove ball bearings. The tried and tested RSH seal uses a highly optimised dual-lip configuration to provide additional protection in demanding environments. For users, the result is bearings that last longer, especially in wet, contaminated or dusty operating conditions, and that need to be replaced less frequently.

A secondary lip on the seal withstands high pressure cleaning and offers increased resistance to the ingress of dust and other contaminants, while the seal’s internal geometry has been optimised for smooth running and improved grease retention.

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The seal is made from acrylo-nitrile-butadiene rubber (NBR), which is resistant to mineral oil based lubricants, petroleum products and animal or vegetable fats. It has an operating temperature range of –40 to +100 °C and up to +120 °C for brief periods.

Previously only available on bearings with an bore diameter of 25mm or less, the RSH seal has now been further developed and tested for use in bearings up to 60mm in bore diameter.

Users can specify SKF Explorer deep groove ball bearings with the new RSH seal installed on one or both sides, depending on the requirements of the end application. The new bearing variants are already being introduced, and the full range will be available worldwide by July 2017. The extended RSH offering joins a growing list of options and improvements in the SKF Explorer range. These include numerous different shield and seal configurations and a choice of cage materials and lubricants.

SKF Explorer was originally developed to take advantage of research into high purity steels with improved fatigue resistance, allowing the development of bearings with a longer rated life and lower friction. The SKF Explorer offering has been continuously extended and improved for more than two decades, with deep groove ball bearings joining the range 14 years ago. Since their introduction, SKF Explorer deep groove ball bearings have set the performance benchmark for the industry, with more than 4 billion bearings sold. SKF Explorer bearings are used in thousands of applications of around the world, from domestic goods to wind turbine generators

SKF is a leading global supplier of bearings, seals, mechatronics, lubrication systems, and services which include technical support, maintenance and reliability services, engineering consulting and training. SKF is represented in more than 130 countries and has around 17,000 distributor locations worldwide. Annual sales in 2016 were SEK 72 787 million and the number of employees was 44 868. www.skf.com    

® SKF is a registered trademark of the SKF Group.

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Stocking up on specialist bearings

Bearing supplier introduces marine grade 316 stainless steel bearings

Specialist supplier of miniature bearings, SMB Bearings, has introduced a new range of 316 grade stainless steel ball bearings to its catalogue. The 316 bearing variety has been specially selected for customers with applications operating in harsh environments, which the bearings can withstand thanks to their marine grade stainless steel construction. The bearings will find a home in food processing, chemical manufacture and pharmaceutical production as well as marine and other liquid process applications.

The 316 bearing range can withstand temperatures of up to 500 degrees centigrade (if supplied without cages) and is highly resistant to seawater, salt spray and chemicals. The key difference between 316 stainless steel bearings and other stainless steel bearings is the addition of molybdenum to the metal – an alloy which drastically enhances the corrosion resistance of the bearing.

The full SMB bearings range includes miniature and instrument bearings, plastic bearings, ceramic bearings, stainless steel bearings, thin section bearings and low noise electric motor bearings.

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SMB Bearings supplies 316 stainless steel bearings with polyethylene, PEEK or PTFE cages – all of which provide excellent corrosion resistance to water, salt water and most chemicals. When used in either a PEEK or PTFE cage, the bearings can sustain temperatures of up to 260 degrees centigrade. What is more, bearings from this range can be used in cryogenic applications down to an impressive -250°C, depending on the cage material.

Bearings made with 316 stainless steel are ideal for marine applications that operate above the waterline, but can also be effective when the bearing is temporarily submerged, providing it is regularly washed down with clean water.

316 stainless steel relies on the presence of oxygen to regenerate the passive film on the surface of the steel and, as a result, 316 stainless steel is a less suitable option if the bearing is permanently submerged. For example, in a low oxygen marine environment, when there is no flow of water, the bearing steel may be prone to pitting corrosion.

While the 316 range is ideal for use in harsh environments, bearings manufactured from this material semi-precision and are only suitable for relatively light loads. The more commonly used 440 grade bearings are more ideal for high load and high precision applications – however, 440 grade bearings will suffer from corrosion in the harsh environments in which 316 grade stainless steel could survive.

In addition to its advantages for marine applications, SMB’s range of 316 stainless steel bearings are also suitable for use in the food and beverage industry. In fact, SMB Bearings can provide a relubrication service to replace the standard lubricant supplied with 316 stainless steel bearings with a food grade lubricant.

More information about SMB Bearings’ 316 stainless steel bearing range and its bespoke relubrication service can be found on the company’s website. Alternatively, if you would like to speak to one of the technical experts at SMB Bearings, you can contact the company’s base in Oxfordshire on +44 (0) 1993 842 555.

About SMB Bearings: SMB Bearings originally specialised in miniature bearings, thin-section bearings and stainless steel bearings. By natural progression, the company expanded the range to include other corrosion resistant bearings such as plastic bearings, 316 stainless bearings and ceramic bearings.

Remaining a specialist business, SMB Bearings provide a high level of product knowledge, providing bearing and lubrication solutions to existing or potential customers, whether individuals or large corporations. SMB Bearings does not just sell bearings, but helps to solve your problems.

For further information please visit http://www.smbbearings.com/

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Gibbons’ marketing team now complete

Gibbons Engineering Group, based in Tollesbury, Essex, has welcomed a new recruit to its marketing team as it looks to improve the quality and reach of its promotional materials.

2017 04 03 103919With an impressive graphic design background including work for TNT, Beresfords and InBusiness, Rael Bearman has joined as Marketing Executive in a role that will see him responsible for creating material such as web content, email advertising, brochures, flyers and logos across all the electrical and mechanical engineering company’s 11 divisions.

Gibbons’ Marketing Manager Nadya Ludhor said: “Filling this vital position means our product launches, content improvement and other plans for 2017 can be even more ambitious and wide-reaching. I’m delighted Rael will be bringing his considerable creative skills to our established team and wish him all the best for a long, happy and successful career with us.”

Gibbons Engineering Group was founded in 1969 and comprises 11 divisions. The company supplies electric motorsvariable-speed drivesHVAC systemspumpsindustrial fansultraviolet solutions and related services to the manufacturing, production, commercial, industrial and agricultural markets.

Gibbons Engineering Group Limited, Woodrolfe Road, Tollesbury, Essex CM9 8RY | 01621 868 138 | www.gibbonsgroup.co.uk | This email address is being protected from spambots. You need JavaScript enabled to view it.

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Forum seals Mojave ROV deal with Norwegian firm

Forum  Energy Technologies, Inc. has delivered a Remotely Operated Vehicle (ROV) to ESEA Submarine AS to perform a variety of offshore roles, including inspection, survey and salvage work.

The powerful and compact Sub-Atlantic™ Mojave will also be used by ESEA Submarine’s sister company, ESEA Marine AS, which has customers that include fish farms, port authorities and insurance companies.

In addition, the Mojave will play a training role in helping ROV pilots to develop their skills.

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Georg Stranden, general manager at ESEA Submarine, said: “We see opportunities in the Norwegian inshore market and found the Mojave suitable for the purpose because it is a truly mobile system which is very powerful for its size.”

ESEA Submarine AS was established during 2016 by Mr Stranden, an industry veteran with more than 30 years’ experience of working with ROVs.

Malcolm Johnston, subsea vehicles sales manager, said: “The Mojave is a well-balanced vehicle that is highly-responsive and powerful for its size. It has a variety of tooling options which makes it an ideal fit for ESEA Submarine with the range of work it will be expected to perform.”

Forum Energy Technologies, Inc. is a global oilfield products company, serving the drilling, subsea, completion, production and infrastructure sectors of the oil and natural gas industry. The Company’s products include highly engineered capital equipment as well as products that are consumed in the drilling, well construction, production and transportation of oil and natural gas. Forum is headquartered in Houston, TX with manufacturing and distribution facilities strategically located around the globe. For more information, please visit www.f-e-t.com