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.
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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.
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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.
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Screw-tools. |