| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce processing time of an NC lathe.SOLUTION: An NC lathe 1 comprises: a motor control part 5a that rotates a main shaft motor 5b for rotationally driving a work at command rotational speed; an X-axis control part 6a and a Z-axis control part 7a that move a cutter holder cutting the work to a command position; a storage part 41 that stores an NC program 411; and a processing program execution part 42 that, when the NC program 411 is read and the current step includes a rotational speed command to the main shaft motor 5b and a move command to the cutter holder, executes the current step and sends a control instruction to the motor control part 5a, and the X-axis control part 6a and the Z-axis control part 7a, and then when movement of the cutter holder is finished before the command rotational speed is reached, that finishes the current step and reads a next step when a deemed target rotational speed between the current rotational speed and the command rotational speed is reached.</p> |
