The sanding belts of sanding belt units fills up during the sanding with wood dust, the abrasive grits wear out during the grinding process. Both processes mitigate perpetually the abrasiveness of the abrasive material. At the beginning of a series of sanded workpieces, which show a different grinding pattern. The industry-PC- machine controls by manufacturer Heesemann contain the subprogram "Belt manager" which adjusts, in dependence from application time of the sanding belt, the parameters points of installation and uninstallation of the sanding shoe, grinding pressure, pressure of the sanding shoe segments in the field of workpiece edges and sanding belt speed in such a way, that the mitigated abrasiveness will be compensated to the greatest possible extend.