The main idea of the ROBA Big principle is to avoid the main disadvantage of all today known drum-based brush sanding machines: Those who work normally with sanding
drums with a diameter of about 310mm are only in a very small area in touch with the work piece, about 30mm. Only in the vertex of the tool a sanding process is possible. To compensate the very small sanding area, those sanding systems must increase their rotation speed to a high level. Only this way they have a chance to be effective. But this results in a “hard touch” of the sanding paper on the parts. This results in 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 ROBA Big is equipped with a newly developed, extra-large sanding brush diameter of 630mm. This 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 market of brush sanding machines.
In this way it is possible to achieve high cutting speeds at low rotation speeds and thus significantly increase the sanding effectiveness. The increased contact area and the soft touch on the part surface guarantees the best results. Low movement speeds of the sanding segments ensure that the sandpaper does not jump over milled grooves of the workpieces. The sanding system enables the brushes to slide into the recesses areas to sand them effectively.
Many sanding options that can be set via PLC, help the operator to set the machine to his requirements.
In particular mass manufacturers or users with fast running finishing lines benefit from the ROBA Big principle.
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