MB Maschinenbau GmbH

Roba Belt - now with the new BA300 belt sanding aggregate

The well known Roba Belt molding and panel sanding series is now extended by an important new aggregate. As the customers previously have already been able to enjoy the very good sanding results and easy handling of the RB brush sanding units, MB now offers also the possibility of work piece calibration and fine-sanding using endless belt.

Due to the modular structure of the Roba Belt line the unit can be easily integrated into any machine configuration.

As a special feature the BA and RB sanding units now have a motorized oscillation. The oscillation stroke is calculated by the PLC control, taking the width of the parts in consideration. This ensures that the wear of the abrasive is always optimal, what improves the life span of the tools and the sanding quality.

First time ever presented will be the new MB Maschinenbau sanding machine for window manufacturers.

Now that many window manufacturers invested in the new kind of automated manufacturing of wooden window parts, time comes up also to run the sanding process efficiently.

Since the part quantities in window production are almost unmanageable, only a highly automated sanding solution makes sense. Equipped with a part detection and program-controlled motorized sanding unit positioning, the new Roba Fentech sanding machine is able to adapt very fast to changing work piece dimensions.

A sophisticated sanding unit configuration and extra-large tools ensure optimal product quality.

Structured surfaces: A Hi Tech product.

The market trend was already noticeable, the furniture shows just ended convinced the last sceptic customer: Antique optics is up-to-date again: being sawed, stamped, planed, or structured, the customers love the natural look of these wood surfaces.

As a woodworking machine builder MB has to adapt to these new trends to offer to the customer adequate solutions. For this purpose MB presented a complete new design to the market to adapt to the requirements of this industrial application.

Since the customers come from the furniture or panel industry and want to stand out from their competitors respectively by fine variations, a structuring machine needs a given flexibility and precision. Further a deep insight in tooling is needed, based on long time experience.

The heavy duty MB Roba Struktumat series offers, connected with the knowledge around this technology, best prerequisites to achieve a satisfactory result.

The welded heavy steel construction of the Struktumat is prerequisite for the installation of efficient tools with a diameter of 250 mm to run without any vibration. Extremely powerful motors up to 15 kW drive the structuring brushes and guarantee high penetration depths at stable rotational speeds.

The basic machine Struktumat 1300/3 is equipped with three processing aggregates. Fewer aggregates mean obviously that compromises on the result have to be made in respect to the achieved visual impression and the surface quality. Especially in hardwood operations this is important.

A spiral drum with steel wires in dense trimming is "tearing up" the wood surface to prepare it for the post-processing. During this process step the wood surface is carved while the intensity is depending on the involved tool. Soft wood grain is worked out more deeply than the hard annual rings.

This process produces up standing wood fibres, particularly unavoidably if you work against the wood grain. These must be eliminated thoroughly since otherwise the haptics and appearance of the stained, lacquered or oiled surfaces would be unacceptable.

To avoid this and to give the surface more depth, a post-processing with the next two rollers is necessary. Equipped with special tools of different grit, wire strength and density, the wood fibres are cut, the structured surface worked out deeply and the surface will be prepared for the finish. According to our experience this complex process cannot be managed with one tool. You can only achieve a result if the machine gets a fine adjusted combination of the first drum followed by further two.

On the other side a three aggregate machine may save costs at machine purchase, but will be paid by the customer by a lot of re-work on the product.

Based on this experience much more customers ask nowadays for a four drum machine. This creates the necessary flexibility to “design” our own result while quality is improved at the same time.

Another product character of the MB Struktumat series is use of high-quality features like motorized axes setting, PLC based component drive and programmable production parameters via Touch Screen.

Since the devil is in detail at the determination of the surface expression, reproducibility of an evaluated result is a must in the industrial mass production. And if the user once experienced that a 1/10 of a millimetre makes a difference in regards to the desired surface, he will learn to love these advantages. Primarily veneered surfaces require this special attention. Therefore MB chooses the uncompromising way with strict view on the result what only allows using technology on the machine side.

But not only the flexibility and precision of the machine is a crucial factor for a perfect result. Also the choice of the appropriate tool requires much experience in connection with substantial tests. The MB test laboratory provides a variety of tools to be combined in either way.

Advanced Brush Sanding Technology

The patented and at the moment most advanced sanding machine, based on brush technology, is the Roba Tech Profi Disc of MB Maschinenbau.

The main idea of the Roba Tech principle is to avoid the main disadvantage of all today known rotational brush sanding machines: Those who work normally with sanding drums and a diameter of about 350 mm are only in a very small area in touch with the work piece.

Only in the vertex of the circumference of the tool a sanding process is possible. To compensate the very small sanding area such systems have to increase the rotation speed to a high degree. Only in this way they have a chance to get some effectiveness. But this results a “hard touch” of the sanding abrasives, what leads to an aggressive behavior on the edges, high temperatures and wavy optic of the material. Hurt edges and totally denibbed surfaces are often the result.

The innovative and patented Roba Tech is equipped with a totally new developed sanding belt containing 174 sanding strips and provides a sanding area of approx. 1300mm x 1500mm “in touch” with the work piece and more than 250 meters of sanding material on all aggregates. This is unique on the market of brush sanding machines. A 360 ° rotation of the sanding aggregate makes it possible to reach all edges and corners of a work piece.

Due to the by this means enlarged sanding effectiveness the machine is able to get best cutting results by lowest rotation speeds. As a result of this, low movement speeds let the sanding strips slide gently into the milled grooves and sand them every effectively.

The additional Profi Disc aggregate at the machine exit is based on a “3-Axes kinematics”. Twelve rotating discs are mounted three master discs, even rotating. This both movements are supported by oscillating stroke. Therefore the aggregate is able to reach smallest millings and able to guarantee an uniform sanding result on all edges.

Another new feature is the enhanced disk system that is suitable for texturing purposes. Here it is advantageous that the disk system distresses both, transverse and longitudinal wood frame rails, uniformly.

The Roba-Twin Flat is developed especially for the window manufacturers who do individual single piece production. However, it also finds use in alljoiner's workshops and industrial plants due its high flexibility.

Operation areas:

-intermediate lacquer sanding

-wood sanding

The Roba-Flat The machine stands  out due to the simple operation and optimal sanding results. The time for processing is shortened considerably.