Minimum lubrication system with an air-oil mixture supplied to the cutting zone. It replaces traditional, uneconomical cooling systems for the treatment zone based on emulsion solutions. In front of the outlet nozzle, air is mixed in under pressure with oil dispensed in a few drops per minute. The lubrication of the cutting zone with such a mixture is very effective, in addition to increasing the machining efficiency and increasing the tool life, it ensures the maintenance of cleanliness in the manufacturing environment. The cooling activation and deactivation is controlled automatically.