Transversal sanding machine for metal surfaces for rounding edges, with 2 upper and lower work groups for simultaneous processing on the edges of both sides. Fixed bench with motorized rubber drive rollers at variable speed. Independent motors for each work group for greater control of processing and management of different working pressures. Touch screen control panel with storage of work programs and alarm self-diagnosis. The maintenance of previous surface treatments is guaranteed by not working on the surface of the piece.