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.