| 摘要 |
This disclosure relates to a tapping spindle including an automatic depth control. The spindle includes coaxial, telescoping driving and driven cylinders, and axial slot-like openings are formed in the cylinders. A slidable roller fits in the openings and normally engages the cylinders. The openings are shaped so that the roller disengages the cylinders upon sufficient relative axial movement thereof, and means is provided to adjust the depth at which the disengagement occurs. A spring is also provided to absorb shock when the tap begins to bite into the workpiece.
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