Blacksmith - Practice.pdf - Kucie stali - Kowalstwo - Noże etc - rudyrpg

BLACKSMITH

PRACTICE

EM 862

War Department Education Manual

CHAPTER XVIII

BLACKSMITHING EQUIPMENT; FORGE FIRES

Whether a farmer can afford a forge and anvil will depend upon the distance to a

blacksmith shop, the amount of machinery repair work he needs to do or have done, and

his ability as a mechanic. Although not every farmer can profitably own blacksmithing

equipment, many farmers can. If a farmer cannot, he should remember that a great deal of

repair work can be done with cold metal, if he has a few simple tools like a vise, a hack

saw, files, cold chisels, and drills.

Although blacksmithing under many conditions should occupy a minor place in a farm

shop course, no such course can be considered complete without at least some instruction

in this work. Blacksmithing is generally more difficult than woodwork. Almost any high

school boy with average mechanical ability, however, can soon learn to do simple

blacksmithing and feel well repaid for his efforts, if he will set himself diligently to the

task. In all mechanical work, much more rapid and satisfactory progress can be made if

the student will carefully study the theory and principles along with his practice. This is

particularly true of blacksmithing.

276. The Forge.- The forge for the farm shop should have a gear driven blower operated

by a crank, and it should have a hearth at least 18 in. wide, preferably somewhat larger.

Probably the cheapest way of providing a good forge is to buy a good blower and tuyere

(that part in the bottom of the hearth through which the blast comes) and make a hearth

and stand of concrete, brick, or other masonry. The forge should be provided with a hood

and pipe connection for taking away the smoke.

277. The Anvil.- Anvils are of two general grades: cast iron and steel. Steel anvils are

much better and should be used if they can be afforded, The two kinds can be

distinguished by striking with a hammer. A cast anvil has a dead sound while a steel one

has a clear ring.

Anvils are commonly available in sizes ranging from 50 to 200 lb. An anvil weighing 100

or 125 lb. would be quite satisfactory for the average farm shop. A piece of railroad iron

20 to 30 in. long, mounted on a suitable block or stand, will serve fairly well for light

hammering and riveting, although a much greater variety of work can be done on a

regular anvil.

Use of Different Parts of Anvil. -- The horn of the anvil is used for making bends and

shaping curved pieces; and the flat face is used for general hammering. The flat

depressed surface near the horn is the chipping block, and here all cutting with cold

chisels and similar tools should be done, rather than on the face of the anvil. The chipping

block is soft and will not damage the chisel if it cuts through. The face is hardened and

cutting into it with a chisel would damage both the chisel and the face, which should be

kept smooth for good blacksmithing.

The better anvils have a comer of the face next to the horn slightly rounded, so that sharp

bends may be made in rods and bars without unduly marring or galling the iron. The

round hole in the face of the anvil is used for punching holes. It is called the pritchel

hole , taking its name from the sharp punch used by smiths in punching nail holes in

horseshoes. The square hole in the face is called the hardy hole and is used for holding

the hardy and other tools, such as swages and fullers.

Fig. 244.--The anvil should be mounted on a solid block and at such a height that the face

of the anvil can just be reached with the knuckles of the clenched fist when standing erect.

Mounting the Anvil. -- The anvil should be mounted on a solid block, preferably of

wood. It should be so located in front of the forge that the workman can take the irons

from the fire and place them on the anvil by making a short turn and without the

necessity of taking even a full step. The horn should be to the workman's left (unless he is

left-handed, in which case it should be to his right). The face of the anvil should be at

such a height that it can be touched with the knuckles of the clenched fist when standing

erect and swinging the arm straight down.

278. Tongs.- At least one or two pairs of tongs will be needed. Various types are available,

but the hollow-bit, curved-lip bolt tongs are probably the most useful. Flat bars as well as

round rods and bolts can be held in them, and the curved part back of the tip makes it

possible to reshape them easily to fit different sizes of stock. By grinding, filing, or

sawing a groove crosswise in each of the lips, the tongs can be made to hold links

practically as well as regular link tongs (see Fig. 245). Tongs 18 to 20 in. long are a good

size for average work.

Fig. 245.-Types of tongs. (A). Flat-jawed hollow-bit tongs. (B). Hollow-bit curved-lip

tongs. This style is very good for the farm shop. Flat bars as well as round rods and bolts

can be held in them.

279. Hammers. -A blacksmith's hand hammer weighing 1 1/2 or 2 lb. and another

weighing 3 or 3 1/2 lb. will handle all ordinary work very satisfactorily.

280. Hardy, Chisels, Punches. -There should be a hardy to fit the hole in the anvil, and

there should be a fair assortment of hand cold chisels and punches. The chisels and

punches may be made in the shop. If considerable blacksmithing is to be done, it would

be well to have a hot cutter and a cold cutter (simply large chisels with handles on them)

for heavy cutting with a sledge hammer. It would be well, also to have one or two large

punches with handles on them for punching holes in hot metal. Punches for making holes

3/8 in. and 1/2 in. in diameter are probably most useful.

281. Vise. -One vise can well serve for all metal work in the farm shop, including

blacksmithing if it is heavy and strong enough. A heavy blacksmith's steel-leg vise with

jaws 4 to 5 in. wide is generally preferred as an all-purpose vise in the farm shop. A leg

vise is one that has one leg extending down to be anchored or fastened into the floor.

Such a vise can be used for heavy hammering and bending better than other types. If

there is a strong steel machinist's box vise in the shop, it can be used for blacksmithing

work if care is used not to do too heavy hammering or bending with it.

Fig. 246.-A heavy blacksmith's steel-leg vise is a good type of vise for the farm shop.

282. Fire Tools. -A small shovel and poker or rake will be needed for use on the forge

fire. These can easily be made in the shop. A flat piece of heavy sheet iron about 3 or 4 in.

wide by 4 or 5 in. long, riveted to a bar or rod for a handle, makes a good shovel. A 1/2-

in. round rod,with an oblong eye in one end to serve as a handle and the other end

flattened and curved, makes a good combination poker and rake.

Fig. 247.-Homemade forge fire tools. A, shovel; B, poker.

283. Measuring Tools. -Some kind of metal rule will be needed for measuring and

checking pieces being forged. A small steel square is very good for both measuring

lengths and checking angles and bends. A wooden rule should not be used to measure hot

iron. A caliper, or a caliper rule, for measuring diameter of rods and thickness of parts,

although not a necessity, will be found very convenient.

Blacksmith - Practice.pdf

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: