| 摘要 |
A metal working machine employing expandible and collapsible cutting tools has a motor driven spindle rotating in only one direction. The spindle has axial movement relative to its driving gear. The axial movement is controlled forwardly, first by a fast advance hydraulic system which also adjusts the expandible and/or collapsible cutting tool to its cutting position, and second by a lead screw and solid feed nut which advances the cutting tool as a required rate for at desired purpose. At the end of the cutting movement the hydraulic system expands or collapses the cutting tool, as the case may be, and starts to rapidly withdraw the tool from the workpiece. During this rapid withdrawal, another motor rapidly rotates the lead screw in a direction to unscrew it back to its starting position.
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