Abstract: A machine has a head with a nozzle, a pipe for supplying water under pressure to the nozzle, and a duct for supplying an abrasive agent, and adding it to the jet of water under pressure. The duct has a first duct portion, fixed with respect to the head in the movements of rotation about a main axis, and a second duct portion, which is fixed with respect to the movements of rotation. A rotating distributor connects the first rotating portion with the second fixed portion of the duct for supplying the abrasive agent. The distributor's stator and rotor are rotatably mounted on one another without the interposition of seal rings and define between them an internal chamber that is substantially at atmospheric pressure and from which the abrasive agent drops by gravity to a duct outlet that converges into the pipe for supplying water under pressure.

Abstract: A machine for cutting, with a hydro-abrasive jet, materials such as, for example, glass, stone, granite, marble, metal materials in general, and all the materials that can be machined using the aforesaid technology, comprises a cutting head (7) mobile according to one or more axes (X, Y, Z, 11, 13). The head (7) includes a nozzle (8) for the emission of a jet of water under pressure, a pipe (14), extending along a main axis (11) of the head, about which the head is able to turn, for supplying water under pressure to the nozzle, and a duct (19) for supplying an abrasive agent, for example garnet, and adding it to the jet of water under pressure. The duct (19) for the abrasive agent comprises a first duct portion (19a), fixed with respect to the head in the movements of rotation about said main axis (11), and a second duct portion (19b), which is, instead, fixed with respect to said movements of rotation.