Patent ID: 6024001
Filing Date: 2000-02-15
Classification: B23B,B23Q,Y10T

Abstract:
A method of turning workpieces, comprising the steps of:(a) holding a workpiece on a first spindle;(b) rotating said first spindle and turning one end of said workpiece by a first tool in a first turning mode;(c) feeding said workpiece toward a second spindle along an axis of said first spindle, said first spindle opposing the second spindle along the axis;(d) holding said workpiece on both said first and said second spindles and cutting off said workpiece at a predetermined position between said first and said second spindles, so that a remaining part of said workpiece is held on said first spindle as a first workpiece and that a cut part of said workpiece is held on said second spindle as a second workpiece that has one end turned in the first turning mode;(e) rotating said first spindle and moving a tool rest for turning a first end of said first workpiece by a first tool in a second turning mode;(f) rotating said second spindle and moving said second spindle in synchronism with the movement of said tool rest for turning a second end of said second workpiece by a second tool in said second turning mode at the same time that said first end of the first workpiece is turned in said second turning mode so that said second workpiece has the first and the second end turned in said first turning mode and in said second turning mode, respectively, said first tool and said second tool being disposed on the tool rest;(g) removing said second workpiece from said second spindle;(h) repeating the steps (c) to (g) with said second turning mode in the steps (e) and (f) replaced by said first turning mode.