Patent ID: 8388276

Claim:
A machine tool, of the type comprising: a casing; a toolholder spindle disposed along an axis and adapted to carry a tool bit; a drive mechanism for driving the toolholder spindle, comprising: a first drive member for rotating the spindle about its axis relative to the casing; and a second drive member for driving the spindle in translation along its axis relative to the casing, the second drive member being screwed on a threaded portion of the spindle, whereby the spindle advances or reverses along its axis as a function of the relative speed of rotation between the first drive member and the second drive member; a first motor coupled to the drive mechanism, for causing the first drive member to rotate; a second motor coupled to the drive mechanism, for causing the second drive member to rotate; and a control unit for controlling the first motor and second motor; wherein the control unit is adapted to control the first motor and second motor independently, so as to adjust, independently of each other, the speed of rotation of the first drive member and the speed of rotation of the second drive member; and wherein the first motor has a first output shaft arranged to rotate the first drive member, the second motor has a second output shaft arranged to rotate the second drive member, and the first shaft and second shaft are arranged one within the other.