Machine tool, in particular for drilling

A machining tool comprising a frame, a drive shaft of a tool being mounted therein so as to pivot about an axis of rotation and to move axially along the axis of rotation, characterized in that the shaft is connected to two rotary motors, namely a first motor connected to a member for coupling by a sliding connection with a first section of the shaft in order to drive the shaft in rotation and a second motor connected to a nut by a helicoidal connection with a second section of the shaft in order to move the shaft axially, in that the first motor and the second motor are coaxial with one another and connected to a control unit connected to position sensors of the rotors of the motors and designed to control the motors so as to produce an axial displacement at constant speed of the drive shaft and to superpose onto this axial displacement axial oscillations having an amplitude and a frequency capable of chip fragmentation, the control unit being designed to permit a modification in real time of the amplitude and the frequency of its oscillations.