An autonomous pallet for positioning and clamping a part to be machined on a machine tool, including fastening members for the positioning and clamping of said part to be machined, the autonomous pallet comprising at least: - embedded equipment for moving said fastening members in a programmable manner, and - a plurality of hydraulic outlets allowing to convey a pressurised fluid towards or from the fastening members, said equipment including at least: - a device for pressurising the fluid, - an electrical energy source , - a plurality of solenoid-valves for dispensing said pressurised fluid composed, for one half, by clamping solenoid-valves and, for one half, by unclamping solenoid-valves , so that each hydraulic outlet is associated to a clamping solenoid-valve , an unclamping solenoid-valve and a hydraulic pressure sensor , and - means for controlling and managing the movement of said fastening members, said autonomous pallet being characterised in that said equipment further include at least a vibration sensor and/or a device for monitoring the positioning of the part on the autonomous pallet comprising at least one compressed air inlet at a predetermined pressure p, a pipe arranged in the autonomous pallet and connecting said compressed air inlet to a plane PP for setting the part P on the autonomous pallet , and a pressure sensor associated to said pipe , and in that each unclamping solenoid-valve includes a coil , a core , a pusher , a connecting rod and a ball associated to said pusher , and is configured so that by transmitting a low modulated current to its coil , it transmits to its core a vibration that it will, in turn, communicate to the pusher through the connecting rod , said vibration causing a slight shift of the ball off its seat and generating a fluid micro-leakage. - embedded equipment for moving said fastening members in a programmable manner, and - a plurality of hydraulic outlets allowing to convey a pressurised fluid towards or from the fastening members, said equipment including at least: - a device for pressurising the fluid, - an electrical energy source , - a plurality of solenoid-valves for dispensing said pressurised fluid composed, for one half, by clamping solenoid-valves and, for one half, by unclamping solenoid-valves , so that each hydraulic outlet is associated to a clamping solenoid-valve , an unclamping solenoid-valve and a hydraulic pressure sensor , and - means for controlling and managing the movement of said fastening members, - a device for pressurising the fluid, - an electrical energy source , - a plurality of solenoid-valves for dispensing said pressurised fluid composed, for one half, by clamping solenoid-valves and, for one half, by unclamping solenoid-valves , so that each hydraulic outlet is associated to a clamping solenoid-valve , an unclamping solenoid-valve and a hydraulic pressure sensor , and - means for controlling and managing the movement of said fastening members, said autonomous pallet being characterised in that said equipment further include at least a vibration sensor and/or a device for monitoring the positioning of the part on the autonomous pallet comprising at least one compressed air inlet at a predetermined pressure p, a pipe arranged in the autonomous pallet and connecting said compressed air inlet to a plane PP for setting the part P on the autonomous pallet , and a pressure sensor associated to said pipe , and in that each unclamping solenoid-valve includes a coil , a core , a pusher , a connecting rod and a ball associated to said pusher , and is configured so that by transmitting a low modulated current to its coil , it transmits to its core a vibration that it will, in turn, communicate to the pusher through the connecting rod , said vibration causing a slight shift of the ball off its seat and generating a fluid micro-leakage. <EOS>