| 摘要 |
A CNC machine tool includes a worktable disposed movably on a machine bed and having a fixed first engaging element, a working disk mounted rotatably on the worktable for holding a workpiece to be cut, and a rotating unit with a rotating shaft journalled on the worktable. A second engaging element is fixed to the working disk. The working disk is rotated mechanically by a preset angle by the rotating unit per one-revolution rotation of the rotating shaft on the worktable. When the rotating unit does not rotate the working disk during rotation of the rotating unit, it activates the first and second engaging elements to engage each other so as to fix the working disk relative to the worktable.
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