Abstract: The milling head (1) comprises:a principal body (2),an interposed piece (5), which is mounted to rotate on the principal body (2) and which is equipped with a first crown gear (12a),means for driving and for blocking in rotation the interposed piece (5) with respect to the body (2),a spindle-holder (3), which is mounted to rotate along axis XX' with respect to the interposed piece (5), on which is fixed a second crown (12b) adapted to mesh with the first crown (12a), and which is mobile in translation along axis XX' between a position of blockage in rotation in which the crown gears (12a, 12b) mesh in one another, and a position of setting in rotation in which the two crown gears (12a, 12b) are out of mesh,means (13) for setting in translation the spindle-holder (3) between the positions of blockage and of setting in rotation,and means (17, 18, 19) for setting in rotation the spindle-holder (3) along axis XX'.

Abstract: The invention relates to a milling device with universal gear and automatic indexation, removably mounted on a milling head bearing a machining spindle, comprising a main body mounted on the milling head and capable of occupying several positions of indexation with respect to said head by rotation about an axis XX.sub.1 lying in line with the axis of the spindle of the milling head, said main body laterally bearing a spindle-holder unit capable of occupying several positions of indexation with respect to the main body by rotation about an axis YY.sub.1 perpendicular to axis XX.sub.1, the spindle of the unit itself being perpendicular to axis YY.sub.1, wherein the spindle of the milling head is connected to the spindle of the spindle-holder unit by a kinematic chain comprising a shaft or sleeve disposed along axis YY.sub.