Machine tool with a device for acting against the weight of a machining head

A machine tool comprising:

• a support structure having a longitudinal axis, and the support structure being one of a cross-member and a vertical upright;
• a machining head, supported by the support structure, comprising a carriage that interfaces with the support structure and a mandrel having a working axis;
• at least one action device mounted to a first exterior surface of the support structure, each of the at least one action device comprising:
• an action member, which acts as a tie-rod or as a pull rod, and is formed as an elongated tubular member that extends along the longitudinal axis of the support structure, the action member having opposing first and second ends,
• a block fixed to the first exterior surface of the support structure, said block receiving therein the first end of the action member,
• an actuator that receives therein the second end of the action member, the actuator being adapted to generate pushing or pulling actions on the action member, the at least one action device adapted to act against deformation of the support structure due to a weight of the machining head acting on the support structure localized in different positions along the longitudinal axis, according to the positioning of said machining head along the longitudinal axis during machining;
• and
• a control system of the at least one action device, the control system comprising an electronic control device and at least one sensor on board the machine tool, the at least one sensor configured to detect deformation at predefined points of the support structure and generating a sensor signal for the electronic control device, the control system operatively connected to act on the at least one action device depending on a value of the sensor signal.