The orbital brushes rotate on their axe and at same time they rotate in number of three (inverter controlled). Furthermore, by combining the rotation with high frequency oscillation covering all working surface, we will achieve a perfectly homogeneous rounding on the edges of any geometrical shape. The R unit is extractable to facilitate brush tool replacement and maintenance operations. The R unit is designed to operate with standard, low-cost, brush cups as well as custom-made brushes for special applications. Depending upon the work type and feed speed, we can configure more R units in sequence.