The Logan County banner. [volume] (Logan, W. Va.) 1889-1903, 1889-12-19
HOW BIC Guns ARE BORED.


HOW BIG GUNS ARE BORED.
Interesting Processes IN the MahafActure
OF Brcech Leading Cannon.
At last the cannon is turned down.
and is ready to DO bored inside. In
this operation II must be bored so
straight and true that the boring tool.
entering ut the exact center Of tho
small end OF the cannon, win come out
precisely at the center OF the large end,
seventeen feet away. Those Of you
who have tried TO bore straight hole
lengthwise through even short bit Of
wood will know that this work requires
not little skill and care.
F. When any Of you boys have job-o OF
boring to do at your workbench. you
make fast The article to be bored and
turn the boring tool. 1t is just the 9TH
or way in boring cannon The bor-
ing tool, or ".bit.n is held firm and mo-
tionless. while tho great mass Of steel
TO be bored turns. around. This plan.
is found TO insure steadiness OF the
'.bit !" Il would be almost impossible
to make. this bit firm and solid enough
10 do its difficult work. and yet FREQ 70
turn around in the cannon. SO II you
had been at the side OF this gun lathe
when the work was begun you would
have seen that the bit was motionless
except for slow advance into the
gun.
The bit attends strictly to business,
and steadily bores Its way through the
steel. Most Of you have been to the.
country and have seen a pig roofing"
in the ground. Imagine, then, the pig
to be standing still and the ground TO
be slowly passing under the pig
snout and being rooted, and You will
have case much like that Of the bit
and the cannon. In fact, the boring
tool is called .,hog-nosed' bit, and 1t
roots up that cannon as II it enjoyed
the operation. No long, graceful curls
come from this boring, but srnaft, crisp
-shuvings that are removed as fast as
they accumulate in or.ler that the bor-
ing tools work shall not be interfered
with. The bit is going into the steel at
the rate of=three-eigh thszof an inch for
every turn OF tho cannon. and it Is
making round hole almost large
enough for boy to put his head in--
five and three-quarler inchesin diameter.
As the round hole grows deeper, the
heavy bar. on which the bit is fastened.
advances into the cannon steadily.
moved by number Of wheels and screws
chat form part OF the lathe.
must not lose sight Of the shavings,
the little ones that come from the iis-
side, and the long, spiraily twisted ones
that are turned from the outside Of the
cannon. A military-looking man.
standing near the lathe. does not lose
sight OF these shavings or trimmings,
either This mans business is to care
fully inspect the behring's and trim
mings. That is what he is paid to do.
Uncle Sam pays him, and he expects
him to earn his salary. The cannon is
being made for Uucie Sam. and he In
tends to find out all It's qualities.
whether good or bad. So the man eyes
the borings carefully. Now, II with q
plane, or your knife-blade, you will cut.
a thin shaving from a bit Of wood II
will show any little flaw existing in the
wood from which 1t was sliced The
tiniest knot-hole or crack will show In
the shaving much more plainly than in
the wood itself So it is with cannon's
shaving. Il is dreadful tell-tale, and
the fault-finding man beside the gun
knows this perfectly well. He exam
ines the spiral turning, or the little
piece Of boring, and finds no evidence
of flaw or crack. Tho long spiral
strip is as smooth MS glass and as
glossy. rs your sisters curls.
Into the solid steel the hog-nosed bit
roots its way until it is in SO far tina,
a little electric light must bear 1t COM
pany. TO show the workmen how mat
ters are progressing in the heart Of the
cannon. After eighteen days ofsteady
boring. the bit let's daylight into the
bore Of the cannon by emerging at the
other Tor larger) end, seventeen feet
away &c. F. Miller, in st. Nicholas