OKUMA CNC lathe LB4000 EX II M * 2000 Long shaft with thread

OKUMA CNC lathe LB4000 EX II M * 1500 machining a long shaft with thread without steady rest. Perfect thread and surface quality without vibration in long shaft machining with Variable Speed Control- Variable Speed Threading function. Material is C45 dimenions dia 150mm * 1500mm. Cutting ap=6mm , f=0.5mm/rev V=75mm/min , ap=0.1mm , pitch =6mm