The lubrication units belonging to ZG.A series are complete systems to produce the oil+air mixture, obtained dosing small amonut of oil in a continuous flow of air. The Oil+air mixer is not provided with electronic monitoring.. The unit is controlled by a PLC which adjust the quantity of lubricant delivered; the controlling elements communicate with PLC programmable unit, which is linked to the central unit of the machine the unit is mounted on. The unit has got filters both on the air line. The management software also contains a specific option to use also GMN spindles (prelubrication).