| 摘要 |
PROBLEM TO BE SOLVED: To variably form a pattern having regularity between work lines. SOLUTION: Many rows of work lines A, B feeding a rotating ball end mill 2 abutting to a worked surface 3 are formed through a fixed pick feed e. Work start points P1, P5 and work end points P2, P6 of each work lines A, B are arranged on a straight line in parallel to each other respectively on the same side, by adjusting a work initial position of a blade of the ball end mill 2 in the work start point P5 of the latter work line B relating to a work initial position of a blade of the ball end mill 2 in the work start point P1 of the former work line A, a phase of irregularity in the feed direction between the work lines A, B is shifted.
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