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Screw-thread′ing ma-chine′.

A machine for cutting or chasing threads on bolts or rods. See also screw-machine; screw-lathe; turret-lathe, etc.

Screw-threading-machine.

In Fig. 4756, the screw is received in the holder i of the feed-head k, and clamped by a gage m′. The feed-head is advanced by the bent lever P engaging the ratchet-bar R to meet the dies which are held by die-holders g secured in the cutter-head R′. When the thread has been cut to the determined length, the end of the screw strikes the end o of the rod n within the hollow shaft f which rotates the cutterhead, forcing the rod back and permitting the dies to open and release the screw.

Screw-threading machine.

In Fig. 4757, the screw blank or bolt is clasped [2075] between two jaws held in the stationary head G by set-screws, and rotation is imparted by bevels, gears, and a winch. The dies are held between the pivoted jaw K and movable head H, which slides on the rod a and advances as the thread is cut.

Screw-tools.

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