求翻译：1）铣A面(大面) 工件以D面朝下，并在虎钳的导轨面上垫上平行垫铁。活动钳口处放置一螺母以夹紧工件。开启机床，均匀摇动升降手柄至工件与刀具轻轻相擦后移动纵向工作台退出工件。升降手柄刻度盘调零，摇需要的切深后扳纵向进给手柄加工平面。是什么意思？

1) a surface milling (large) workpiece d face down, and Vice on the track surface on a cushion of parallel clamp. Active jaw space for you to place a nut clamping the workpiece. Turn on machine tool, even shake the lifting handle to move vertical bench after gently rubbing the workpiece and tool exi