A double fibre laser cutting system for laser cutting sheet metal that comprises: a cutting machine with a mobile gantry and fixed metal sheets, multiple heads both for straight cutting and bevel cutting, multiple cutting sources in each head, automated means for changing the cutting source in each head, means for controlling all the elements, wherein the multiple cutting sources in each head is carried out by means of two fibres sent from corresponding generator outlets to each head. The simultaneous cutting of one or more metal sheets with different thicknesses is achieved and, consequently, maximum laser cutting capacity in useful length, and in useful width, the use of a single generator, and the automatic adjustment of cutting conditions in accordance with the thicknesses, straight and bevel cutting simultaneously in multiple heads.
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