| 摘要 |
An improved threading attachment for turning machines incorporates a carrier for holding a tool such as a tap, a stationary supporting arbor and a sliding spindle extending between the arbor and carrier in coaxial relationship with the tap. The spindle shifts axially relative to the carrier and arbor and automatically disengages the carrier from the arbor to terminate a thread cutting operation when the tap has advanced through a hole by a predetermined amount or has bottomed in a blind hole.
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