| 摘要 |
PROBLEM TO BE SOLVED: To avoid accidents including tool breakage due to mis-instructions by a worker by allowing a machine tool stopped during machining an inclined hole or an inclined plane to be easily and accurately reset to a before-stopped coordinate system when restarted. SOLUTION: The NC machine tool comprises a tool rest whose position on a two-dimensional coordinate is NC-controlled and a rotary tool shaft mounted on the tool rest, whose turning angle around the shaft perpendicular to the two-dimensional coordinate plane is NC-controlled. A NC control device has coordinate transforming means (aligned coordinate transforming means) for transforming the two-dimensional coordinate to such a coordinate that the tool is fed at a detected angle of the rotary tool shaft and manual calling means for the aligned coordinate transforming means. The NC machine tool can be reset to the before-stopped coordinate system only by operator's operation of calling the aligned coordinate transforming means (a macroprogram) after restarting the tool. COPYRIGHT: (C)2003,JPO
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