Boring machine comprising a variable-geometry cutting device

A boring machine including:

• a frame bearing at least a first milling drum, the frame having a body extending along a longitudinal direction;
• at least a first motor to drive the milling drum in rotation about a first axis of rotation;
• at least a first arm having a lower end part, the first arm being movable with respect to the body;
• at least a first support bearing the first milling drum and the first motor, the first support being connected to the lower end part of the first arm while being movable with respect to the body of the frame,
• an actuating device connected to the body to displace at least the first arm with respect to the body;
• said boring machine being characterized in that the body further includes:
• a translational guiding device extending along the longitudinal direction,
• the boring machine further comprising a movable member disposed in the body above the first support and interacting with the translational guiding device such that the movable member is displaceable with respect to the body along the longitudinal direction while being guided by the translational guiding device, wherein the movable member is housed in the translational guiding device such as to form together a sliding coupling, and the first arm is mounted pivotably on the movable member.