Computer-controlled, power-operated machine tool for abrasive jet cutting and machining; Machines and machine tools for the cutting and forming of materials; Waterjet cutting machines and cutting heads for power operated waterjet cutting equipment; replacement parts for power operated waterjet cutting equipment, namely, nozzles, orifices, alignment inserts, housing inserts, adaptors, valves, tubes, water jet nuts, threaded discs, filters, seats; replacement parts for waterjet cutting machines, namely, replacement abrasive regulators for use with power operated waterjet cutting machines and replacement abrasive pots for use with power operated waterjet cutting equipment; water pumps for use in power operated waterjet cutting machines and replacement parts for water pumps used in power operated waterjet cutting machines, namely, seals, hoops, back-ups, plungers, pistons, valves, switches, stems, seats, rings, bearings, caps, poppets, springs, adaptors, tubes, pins, filters, needles, intensifiers and cylinders; abrasive regulators for use with power operated waterjet cutting equipment; abrasive pots for use with power operated waterjet cutting equipment