Based on small-type high precisiong gang tool type lathe 20G,20GT is equipped with pneumatic tailstock and pneumatic turret,which could realize the machining of long length high precision parts,The high rigiding pneumatic tailstock and sophisticated small-type high precision hexagonal turret make it easier to ensure the machining accuracy of long length parts.The small type turret can be equipped with excircle tool holder and drilling tool holder,CS function can be set to realize the precision machining of curve or curve or curved surface.