Machine for cutting slabs and thick slabs by means of two wires, featuring an arc-welded steel structure which is heat treated to ensure the required stiffness of the system and a top cutting precision. It is provided with two 1.000 mm Ø driving pulleys, actuated by an inverter controlled asynchronous motor that optimizes the wire peripheral speed in accordance with the material to be sawn. Two pairs of driven pulleys with the same diameter are constantly kept under tension by two pneumatic cylinders thus giving the wire an ideal and independent tension. The assembly is complemented by two additional, independent 1.000 mm Ø driven pulleys and four wire driving pulleys.