| 摘要 |
A drilling and turning power head with an externally threaded spindle adapted to support and feed a tool. The spindle is supported in a cylindrical sleeve by means of bearings and is driven by pulleys and belts from a power axle coupled to a motor. An internally threaded feed hub is mounted on the spindle along with a releasably connected drive hub and both are rotated at different speeds by V-belts from the power axle. Axial feed of the spindle is brought about by the difference in the speed of rotation of the two hubs. Retraction of the spindle is brought about simply by disconnecting the drive hub from the spindle.
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