Handbook of Birmingham: Prepared for the Members of the British Association, 1886British Association for the Advancement of Science
History
Handbook of Birmingham: Prepared for the Members of the British Association, 1886
British Association for the Advancement of Science
Birmingham (England); Natural history -- England -- Birmingham
SHAPING.--Thin metal is shaped by pressure applied by means of a
screw press, the metal being placed between a die or mould and its
counterpart.
AUTOMATIC MACHINERY.--A number of articles produced from wire, such
as pins, nails, hooks and eyes, hair pins, etc., are made completely
by automatic machinery, the wire being wound off a reel at one end of
the machine and transformed into the various articles as it passes
along until it comes out at the other end of the machine, a finished or
nearly finished article.
AUTOMATIC TURNING AND SHAPING.--Gun stocks, boot lasts, tool handles
and other similar articles are automatically turned. With a gun stock
for example, the rough form cut from a plank is put in a lathe, above
is placed a steel model or dummy of the form required to be turned,
the model and the wooden blank are made to revolve at precisely the
same speed, and a rotating cutter travels slowly along from one end of
the blank to the other, the movement of the cutter inwards or outwards
being regulated by the dummy. The wooden blank having been put in the
lathes, the cutting is started, and it then goes on until finished,
when the lathe stops automatically. The shaping of gun locks and many
other parts of the gun is effected by causing a revolving cutter to be
moved over a fixed steel model or dummy, the cutter thus shapes the
blank to a fac-simile of the pattern or dummy.[50]
SPINNING.--Tea pot bodies and a variety of articles in Britannia metal
are “spun.” A piece of wood 4 or 5 inches in diameter is attached to
the lathe head, and in this a hollow corresponding to the bottom of the
tea pot is turned. A sheet of metal of a foot or so diameter is now put
against the wood and pressed into the hollow by a wooden cylindrical
mould with a round base which corresponds to the concavity. The disc is
rotated very rapidly and the workman presses the soft metal over the
mould so as to form a vessel in shape somewhat resembling a coffee cup
with upright sides, the cylindrical mould is taken out and replaced
by a disc of wood in two halves, held in place by a spindle from the
back centre of the lathe. The metal cylinder is now gradually closed
in until the opening is reduced to the required size, when the body is
complete. The spindle is withdrawn and the divided disc of wood easily
shakes out.
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