WORKING METHOD, NC DEVICE COMMANDING SAME, NC WORKING MACHINE, NC PROGRAM COMPOSING DEVICE, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To avoid damage to tools and improve their working efficiency. SOLUTION: For forming a reentrant 61 in a workpiece, an end mill EM is first moved along the inside of the contour line (a) of the reentrant to finish an annular groove 62 of a width generally equal to the diameter of the end mill EM inside the contour line (a). The end mill EM is then used to cut or rough a land part 63 within the annular groove 62 until the reentrant 61 has a depth D.