Disclosed is an electric cutting machine comprising: a base (1); a longitudinally movable table (2); a cutting head (3) provided with a cutting disc (32) and an electric drive motor (33); two rolling assemblies (4) with wheels (41) and rolling bearings (43) mounted by means of independent axles (42, 44) on a vertical partition (52) of parallel longitudinal profiles (5) mounted on the base (1); a pair of longitudinal guides (6) attached to the movable table (2) and which comprise a longitudinal support track (63) for supporting on the wheels (41) of the corresponding rolling assembly (4), and a horizontal wing (65) located under the rolling bearings (43) of the corresponding rolling assembly (4); and interchangeable longitudinal guides (6a) longer than the longitudinal guides (6), for adapting the cutting capacity.