| 摘要 |
A machine tool which provides rotative movement to the work piece, including a source of power driving a spindle which spindle includes a collet receiving draw bar with an air driven and controlled piston attached to the piston for automatically shifting the draw bar inwardly into the spindle whereby the collet is closed about the work piece. The entire spindle unit including the draw bar shifting piston is rotatably mounted for rotation within a mounting base.
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