The employment of ripped belts provide a high running smoothness of Heesemann sanding machines. Contrary to multiple single v-belts these ripped belts run with considerably lower vibration. The velocity-synchronous drive of both guide rollers at the unit allow a high power transmission at low sanding belt tension. This permits a high pressure beam tolerance compensation and a high sanding belt adaptability on distorted workpieces and workpieces with certain amounts of tolerance. In addition, the sanding units' running smoothness is optimized through fine-balanced rolls.