| 摘要 |
A thread milling attachment for engine lathes, particularly for milling a wide variety of special threads on workpieces, is described. The attachment device is readily attachable to an ordinary lathe by mounting to its cross-slide in substitution for the usual compound-rest, and includes a self-powered drive spindle mechanism operative to screw-turn a workpiece forewardly or rearwardly, selectively, with respect to a milling cutter turned by the associated lathe for milling threads on the workpiece the shape of which is controlled by the shape of the milling cutter and the pitch of which is adjustably controlled by an interchangeable lead-screw portion of the drive spindle mechanism.
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