Abstract: Described is an automatic threading machine comprising an electric motor (2) having a rotor (3) designed to selectively rotate in both directions about an axis (4) and a tool holder spindle (7) able to move with a rotating movement about the axis (4) and with a translating movement along the axis (4). The rotor (3) controls the rotating movement of the tool holder spindle (7) about the axis (4). The tool holder spindle (7) is supported by the rotor (3) and moves as one with it in the rotating movement about the axis (4). The rotor (3) has internally a chamber (5) along which the tool holder spindle (7) can translate along the axis (4) and which is suitable for at least partly housing the tool holder spindle (7) in at least one position adopted by the tool holder spindle. The electric motor (2) comprises stator windings (10) arranged radially outside the rotor (3) and the chamber (5). The stator windings (10), the rotor (3) and the chamber (5) extend along the axis (4) for at least one shared stretch.

Abstract: Described is an automatic threading machine comprising an electric motor (2) having a rotor (3) designed to selectively rotate in both directions about an axis (4) and a tool holder spindle (7) able to move with a rotating movement about the axis (4) and with a translating movement along the axis (4). The rotor (3) controls the rotating movement of the tool holder spindle (7) about the axis (4). The tool holder spindle (7) is supported by the rotor (3) and moves as one with it in the rotating movement about the axis (4). The rotor (3) has internally a chamber (5) along which the tool holder spindle (7) can translate along the axis (4) and which is suitable for at least partly housing the tool holder spindle (7) in at least one position adopted by the tool holder spindle. The electric motor (2) comprises stator windings (10) arranged radially outside the rotor (3) and the chamber (5). The stator windings (10), the rotor (3) and the chamber (5) extend along the axis (4) for at least one shared stretch.