A machine tool for machining, comprising: - a plurality of machining stations configured to machine a plurality of workpieces; - a workpiece-supporting unit having a plurality of gripping regions adapted to be sequentially associated to the machining stations ; - a plurality of gripping members , each gripping member being placed in a respective gripping region of the workpiece-support unit and comprising: - a plurality of jaws adapted to be rotated about a jaw rotation axis (P-P) and configured to grip a workpiece; - first engaging members rotating and kinematically rotatably connected to the plurality of jaws ; - a plurality of actuator members for actuating the rotation of the jaws about respective jaws rotation axes (P-P) by acting on the first engaging members , each actuator member comprising second engaging members , rotatable and movable from\toward their respective first engaging members of the gripping members to act on said first engaging members ; characterised in that: - the machine tool comprises a guide for the first engaging members , extending between the machining stations , the first engaging members being configured to slide on the guide upon actuation of the workpiece-supporting unit , the guide having a plurality of gaps adapted to be positioned at the gripping regions ; - each second engaging member is at least partially arranged in a respective gap of the guide , the second engaging member being engaged with its respective first engaging member when the gripping regions are associated with the machining stations . - a plurality of machining stations configured to machine a plurality of workpieces; - a workpiece-supporting unit having a plurality of gripping regions adapted to be sequentially associated to the machining stations ; - a plurality of gripping members , each gripping member being placed in a respective gripping region of the workpiece-support unit and comprising: - a plurality of jaws adapted to be rotated about a jaw rotation axis (P-P) and configured to grip a workpiece; - first engaging members rotating and kinematically rotatably connected to the plurality of jaws ; - a plurality of jaws adapted to be rotated about a jaw rotation axis (P-P) and configured to grip a workpiece; - first engaging members rotating and kinematically rotatably connected to the plurality of jaws ; - a plurality of actuator members for actuating the rotation of the jaws about respective jaws rotation axes (P-P) by acting on the first engaging members , each actuator member comprising second engaging members , rotatable and movable from\toward their respective first engaging members of the gripping members to act on said first engaging members ; - the machine tool comprises a guide for the first engaging members , extending between the machining stations , the first engaging members being configured to slide on the guide upon actuation of the workpiece-supporting unit , the guide having a plurality of gaps adapted to be positioned at the gripping regions ; - each second engaging member is at least partially arranged in a respective gap of the guide , the second engaging member being engaged with its respective first engaging member when the gripping regions are associated with the machining stations . <EOS>