For the bed of this series, its double finning plate and inner finning plate on sidewall in width aredesigned for a composite structure between box type and diagonal bar, and thus the integralrigidity is increased by one third in comparison with that in single-wall and door shaped finningstructure; the slide carriage is equipped with a quick travel mechanism, which can be operatedvisually with a monolever; to transform the main shaft direction of rotation or to brake is underhydraulic control, and the function of hand brake or foot brake can be operated easily andflexibly on the safe side; both structural rigidity and driving rigidity of the lathes are higherwith steady precise and heavy cutting; the tailstock is equipped with a scale dial and scalemark and can be used visually; the lathes are of handsome appearance and easy cleaning andmaintenance on the whole; the headstock are forcedly lubricated with pressure oil; and thecooling fits are handsome on the safe side with hydroelectric separation.