The starting point of the ROBA Profi Brush sanding principle is sanding in the same direction and then in the opposite direction: Only this procedure guarantees that standing wood fibers are cut off in any case, regardless of the fiber direction of the material, be it wood or MDF.

In the basic version, the machine has two sanding rollers with a pressure roller system and in this version represents the solid basic equipment for every user who is striving for an optimum price/performance ratio.

Due to the modular structure, the ROBA Profi Brush series can be expanded with other systems such as disk, cross belt and cleaning units.

Many possible combinations allow the user to put together a ROBA Profi Disk for his special application.

A double brush works in the same and then in the opposite direction: Only this procedure guarantees that standing wood fibers are cut off in any case, regardless of the direction of growth of the wood. The Profi Disk system then grinds the workpiece down to the last detail. This is made possible by the 3-axis disc system kinematics, which is a special design by MB: four 200mm disc grinding tools, each with 14 grinding strips, rotate around themselves. These in turn are mounted on three large master discs, which also rotate. In addition, the entire unit oscillates back and forth. All axes are individually adjustable. This allows the grinding optics to be significantly influenced. The kinematics are based on a grinding process with an eccentric grinder and guarantee a uniform surface structure.

The reinforced disc unit is new and can now also be used for light structuring and calibration work. To do this, it is arranged at the machine infeed and adapted to the task by using special disc tools: discs with wire strands are used for structuring, regardless of the grain of the wood. The flat Micron Disks are used for sanding flat surfaces and ensure a chaotic sanding pattern that can be more easily covered with a top coat. Conical discs make it easier to sand edges and V-shaped millings, as the sanding brushes inclined at an angle can better reach the milling contours.

The starting point of the ROBA Big grinding principle is the main disadvantage of all previously known brush grinding machines: The usual machines working with grinding rollers usually have a brush diameter of approx. 310mm. This means that they only touch the workpieces in a very narrow area, around 30mm wide, because the grinding process only takes place at the apex of the tool. To compensate for this, these systems require high rotational speeds. However, high speeds lead to undesirable hardening of the abrasive, which leads to aggressive removal of the workpiece. The result is damaged edges and sanded surfaces.

The innovative ROBA Big is equipped with a newly developed, extra-large grinding brush diameter of 630mm, which makes it possible to expand the contact area with the workpiece to approx. 300mm. The increased number of slots allows more than 500 meters of abrasive to be installed, depending on the machine configuration. This is unique on the brush grinding machine market.