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The advanced Homag twin-table CNC portal milling machine can cut precision interior components to a high level of accuracy and is particularly impressive when it comes to “nesting” – cutting different parts out of a single large base panel while taking into account the variable panel characteristics, thickness, direction of wood grain, single- or double-sided veneering, and so on.

The cutter is fed by an automated panel feeder. The crossbeam of the panel feeder positions the panel in precisely the right place on the milling table.
The milling machine consists of two tables where panels can be machined either successively or independently. While a panel is being cut on one table, the finished parts can be removed from the other and coded. The machine is also equipped with a tool storage system that holds 18 different tools. The software automatically selects the best one, meaning that it has virtually unlimited control over the widest possible variety of machining techniques.

It is also equipped with a drilling unit that makes it possible to drill the workpieces both horizontally and vertically. In addition to the tool storage, the drill unit can hold 13 drills, extending the selection of tools to 31 items. The computer-controlled Homag Bargstedt panel feeder – which is linked by software directly to the project administration – is an automated self-learning feeder that supplies the CNC portal milling machine.
“Self-learning” means that when the feeder is not instructed to place a panel on the cutter, it will independently switch panels from one station to the other. It naturally has a good reason for doing this! It remembers which panels are used most frequently and places these as close as possible to the cutter, so that it takes less time to load the ones most commonly used. The surface area of the automated feeder measures 200 m2.

There is room for 30 stacks of panels in the feeder. A maximum of 30 stacks does not, however, mean that the feeder can only hold a maximum of 30 different types of panel. The IntelliStore software makes it possible to stack several different types of panels randomly. The software remembers which panel has been placed where, and when the cutter asks for a certain type of panel that is not on top, the stacker will quickly shift the uppermost panels to stacks alongside until it has reached the correct one. The feeder shifts panels at a maximum speed of 70 m/min.

The new Linssen spray booths have been positioned so that freshly blast cleaned hulls can be transported under cover to the spray booth. One spectacular detail of Linssen Yachts‘ new preservation halls is the underfloor heating system. An unimaginably long heating circuit has been laid involving a total of almost 3 km of heating lines in a mirror-smooth concrete floor 20 cm thick!
The secret behind the Linssen Yachts application has always been the fact that throughout the entire coating process, 24 hours a day, seven days a week, the hulls are kept warmer than the ambient air to prevent condensation from forming. Whenever coats of paint are applied to a hull which is colder than the ambient air the inevitable formation of condensation is likely to cause problems.

Even the most expensive paints lose their value when they are applied inexpertly or within an unsuitable infrastructure. When, in order to save money, a heating system is turned down to a low level at night and turned up again in the morning, this is especially bad for the coating of a steel yacht. Thanks to the underfloor heating system, Linssen hulls are, so to speak, permanently kept on a heating plate which never cools down. This saves energy while improving the quality of the product and process. At Linssen Yachts, coating technology is approached in a scientific manner. By yacht building standards, our infrastructure and working methods could therefore be described as almost ‘clinical’!

Our advice is visit the companies behind the brand names of your choice and ask them specifically for detailed information on coating, the method of application and the technical facilities they have at their disposal. Make an objective comparison with Linssen Yachts… and then decide for yourself.

Linssen coating systems.
Almost clinical by yacht building standards

As far as Linssen Yachts is aware, Linssen is the only yacht builder in the Netherlands to have its own blasting cabin – and that has been the case since 1982!

Once the steel hull has been constructed it should be completely blast cleaned. This is the only correct method for blasting all the critical points -- for example, weld seams, grinding seams, angles, indentations and edges – and ultimately obtaining a completely clean, grease-free and fresh hull!

Linssen production shot blasting

As far as Linssen Yachts is aware, Linssen is the only yacht builder in the Netherlands to have its own blasting cabin – and that has been the case since 1982!

Once the steel hull has been constructed it should be completely blast cleaned. This is the only correct method for blasting all the critical points -- for example, weld seams, grinding seams, angles, indentations and edges – and ultimately obtaining a completely clean, grease-free and fresh hull!


There are yacht builders who use pre-blasted steel plate and then still claim to be producing a blast-cleaned boat. However, in this case, weld seams, etc. are not blast cleaned although this is what determines quality and service life.

At Linssen Yachts we go much further. Here too, pre-blasted plates and sections are used to ensure that all mill scale (a result of the milling process during the production of steel plates) has already been removed before construction work starts. However, once the hull has been completed, the outside of it is blast cleaned all over again using modern blasting techniques so that the whole surface is freshly blast cleaned before the most important coat of paint, the first coat, is applied. It is important because this undercoat could be said to support the rest of the coating system. All weld seams, grinding seams, angles and edges are therefore meticulously blast cleaned.

Yacht builders who use pre-blasted and pre-primed material support their paint system on a dirty coat of primer which has been exposed to external conditions throughout the transport, storage, metalworking and construction process.

Linssen Steel Assembly. Top quality starts with the basics.

However, Linssen Yachts has always looked on these developments in a professional manner and have even taken it as a compliment – after all “imitation is the most sincere form of flattery”! Whatever the case may be, Linssen owners are guaranteed that they are spending their leisure time on board an original. And that’s a good feeling…

When we talk about quality, hull construction is also a determining factor. Over the years Linssen has accumulated a lot of know-how in this area. At Linssen Yachts hull construction is therefore a highly professional process. It starts with the design stage in which the designer is not just looking at the aesthetics but is considering from the outset the construction aspect and what is and what is not technically feasible. The engineering then follows in which construction, technology and design are coordinated by means of special computer programs. All the details are fully worked out digitally before the data is sent to the hull construction department. There, all the components are cut out with great precision by CNC plasma cutters and coded.

The construction is characterised by a balanced combination of longitudinal and transverse connections on the bottom (web frames, frames, bulkheads and stringers), which – made possible by CAD/CAM and CNC plasma cutting – go half in/over each other at the crossing points (known as “notching”). This makes the construction really sturdy and coating-friendly, i.e. it has good anti-corrosion properties.

The engine bed is an extension of the longitudinal stringers that run from stern to bow. These stringers are crossed by two web frames positioned athwartships and the four mounting points of the engine(s) are superimposed exactly on the four crossing points (Linssen Dual Cross engine bed). This immediately also lays the foundations for the low-vibration and low-noise characteristics of each Linssen Grand Sturdy.
Much use is made of folding work in a Linssen hull. Folding work involves the bending of sheet steel components into different radiuses, which creates a taut radius, providing a smooth surface for painting. What’s more, every fold is one welded seam less, the result of which is less contraction, tauter hulls, less filling work and therefore an even better finish.

The construction of the Linssen hull has been developed in-house by Linssen Yachts and is based on the Linssen FBFS (Fixed Bottom Flex Sides) system. In principle, this means that the bottom is constructed around the engine bed and the keel. The shell is reinforced by a combination of longitudinal and cross bracing so that it remains extremely taut during construction and a minimum of filling work is required at the coating stage.

All floor beams consist of square and rectangular hollow steel sections. This has major benefits as it creates a maximum of rigidity and the entire structure is self-supporting. This means that no supports are needed to the bottom and so any vibration is not mechanically transmitted from the bottom to the floor. In most other steel boats, however, this type of floor support is actually necessary.

In addition, there is a certain amount of residual flexibility in the construction as a whole, which once again has a noise-reducing effect. The tubular steel construction is easily preserved, which means no inaccessible points that require painting (which would be the case, for example, with angle sections) are left in the construction which could then lead to corrosion. The construction has been chosen so that the FIS system (Floor Integrated System) can be incorporated into it.

In the design and finish of the superstructure, attention is expressly focused on ensuring that it has a coating-friendly and therefore maintenance-friendly exterior. Careful consideration is given to the choice of materials, drainage systems, rounded angles, deformations (folding, bending) and the positioning of components.

The base of the windscreen is made entirely of stainless steel but is blasted and preserved along with the rest to provide optimum protection. Even the swimming platform is made of stainless steel. Typical examples of concealed Linssen quality.

Linssen Yachts in Maasbracht has a motivated team of qualified experts working at their drawing boards and computer screens. Their combined knowledge of all aspects of the complex trade of yacht building and water sports is a driving factor behind the success of the Linssen brand.

It starts with the design stage in which the designer is not just looking at the aesthetics but from the outset is considering the construction aspect and what is technically feasible and what is not. Next follows the engineering in which construction, technology and design are coordinated by means of advanced 3D CAD/CAM computer programs.

Retaining, further developing and perfecting tried and tested technologies. Selecting, testing and integrating new technologies. Two basic principles which are the thread that runs through our company policy. At Linssen Yachts, product development is based on long-term strategies and clear objectives. So it’s hardly surprising that over the years, Linssen has set significant trends time and again.

The result:
Innovative yachts from which skippers often derive decades of pleasure.

Latest News

Quotes

"With this all-new boat, Linssen's pursuit of refinement has reached new levels of excellence, enabling the yard to produce one of the most relaxing displacement cruisers that we've ever tested in some time".

Motor boat & Yachting, Vol 167; May 2019 - Jack Haines on the Grand Sturdy 500 AC Variotop

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Linssen Magazine no 55

October 2019
   

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