A machine for working metal or plastic sections, comprising a bed (1), a stand (3) supported on said bed (1) and movable through guides (4) along a first direction (X); a spindle assembly (5) supported by a plate (7) that in turn is slidable along an axis (Y) perpendicular to the former through a guide (6). The bed (1) is provided with at least one additional clamp (12) for gripping the section, such clamp being movable along the longitudinal axis (X) of the bed during the working of the section.