| 摘要 |
la1 Title: External thread Machining Device Abstract The invention relates to a structure improvement for an external thread machining device mounted on a lathe, comprising a tap shank connected with a tailstock of the lathe and a threading die sleeve capable of being sleeved on a workpiece. The threading die sleeve and the tap shank are arranged coaxially. The threading die sleeve and the tap shank are in axial sliding connection, an axial bar chute is provided on the tap shank, and a guide positioning pillar which is able to resist against the interior of the bar chute is arranged on the threading die sleeve. a ---------- i |
