车床附件
A Thread Cutting Attachment for the Taig Lathe

Introduction
This is an adaptation to the Taig of a Unimat 3 threading attachment described by J. H. Frost in the March/April 1994 issue of the Model Engineers' Workshop.The approach resembles a woodworking lathe duplicating attachment in that it simply copies any thread pitch for which you already have a sample. Because this eliminates the need for change gears and a leadscrew, it makes threading pretty simple and inexpensive.
To anyone doubting its effectiveness, just have a look at the work of John Bentley who used a similar technique for years in craftsmanship of the highest quality.
Design
A three-jaw chuck mounted outboard on the headstock spindle carries a threaded leader with the pitch to be copied. Riding on the leader is a follower nut which is connected to a drive rod. The drive rod runs through a guide block to a connection on the lathe carriage. As the lathe spindle turns, the lead of the follower nut on the leader is duplicated in the movement of the lathe carriage and its cutter.
Parts Assembly Drawing

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