I should have thought of that, but when I first found the single outcropping of machined metal, I figured it was very small.
The exposed half was a shining thing of ebony, whose planes and angles were machined with mathematical exactness.
Phyfe reprimanded every archeologist on the expedition for not notifying him immediately whenever anything from the smallestmachined fragment of metal to the greatest stone monuments were found.
The lower surface of the flywheel had been machined so as to form a friction disc, with a one-quarter inch depression 3 inches in diameter turned in the center.
To the connecting rod was attached a rather ordinary ringed piston, over which was fitted a free, ringless piston, machined to fit closely the cylinder bore.
These cages were then dropped into the ends of the valve boxes until they came up against machined shoulders and were held in place by internal ring nuts screwed into the valve box.
The cylinder was machined all over; two flanges, one at the bottom and the other about two-thirds of the way down provided the surfaces against which the water jacket was shrunk.
The rods were for the first time made of I-section forgings, a major departure, machined on the sides and hand finished at the ends, with a babbit lining in the big end, the piston pin bearing remaining steel on steel.
The integrally cast cylinder water jackets were abandoned and the top of the crankcase was machined flat to provide a mounting deck for individual cylinders.
The cams were machined as separate parts and then sweated onto the shaft.
The exhaust gas, after flowing through the passages in the valve cage, was discharged directly to the atmosphere through a series of holes machined in one side of the valve box.
I had a few thousand of each of the thirty-four different sizes of fasteners machined from steel, and magnetized a fly-tier's tweezers.
I took the chair beside the desk and watched him go through the business of unloading his pipe, taking the carefully air-tight top off the humidor we had machined for him down in the lab, and loading up with the cheapest Burley you can buy.
It rides in the extractor groove, which is machined in the head of the cartridge case.
They are in turn machined and will have a pattern of marks or scratches on their surfaces which will mark cartridge cases in the same manner each time.
Mouldings are machined by the length, then cut into cornices, mitred round panels, or affixed to the edge of a plain slab of wood, giving it the effect of carving.
The dovetail grooves are machinedin the feet or ends of the arms and in these slots the laminations forming the armature coil engage.
Close fitting guides moving in an accurately machined slot on the base preserve a correct alignment of the motor when adjustment of the latter is required.
The brushes are equipped with riveted pigtails, and held in brass brush boxes machined to gauge.
In the smallest sizes the punchings are mounted directly on the shaft, which is properly machined to hold them firmly.
Modifications of the blast method are used in finishing molded plastics, metal die-castings, and machined parts.
I have not yet built the picker but a number of the parts have already been machined and before long it will be a reality.
The science of jig making is exhaustively discussed, and particular attention is paid to drill jigs, boring, profiling and milling fixtures and other devices in which the parts to be machined are located and fastened within the contrivances.
The nine steel connecting rods are machined all over and are fitted at each end with bronze bushings, the distance between the bearing centers being about 3.
The cylinders are machined upon the sides so that when assembled on the crank-case with grooved hold-down washers tightened, they form a solid block, greatly assisting the rigidity of crank-case.
Pistons are made cast iron, accurately machined and ground to exact dimensions, which are carefully balanced.
This consists of two accurately machined forgings held together by bolts as clearly indicated.
The cylinders are made of high-grade castings and are machined and ground accurately to size.
In place of the barrel of the gun one has a smoothly machined cylinder in which a small cylindrical or barrel-shaped element fitting the bore closely may be likened to a bullet or cannon ball.
The lower portion of the skirt is machined inside and has a wall thickness of 1 mm.
Valve stem guides and valve stems must be machined very accurately to insure correct action.
The steel cylinders are machined from solid forgings and provided with webs for air-cooling as shown.
The cylinders were machined out of solid nickel chrome-steel ingots, and the machining was carried out so that the cylinder walls were under 1/6 of an inch in thickness.
The cylinders are made from steel forgings, as are the valve chamber elbows, which are machined all over and welded together.
The complete engine has fourteen cylinders, of forged steelmachined all over, and so secured to the crank case that any one can be removed without parting the crank case.
Connecting rods and crankshaft are of steel, the latter being machined from a solid steel forging and carried in five roller bearings and one plain bearing at the forward end.
The crankshaft was a nickel chrome steel forging, machined hollow, with four crank pins set at 180 degrees to each other, and carried in three bearings lined with anti-friction metal.
But this fortune drops in half casually at the last by a series of stage accidents, not ill-machined by any means, but not very particularly interesting.
The Government discovered that 3-inch shell rejected for various reasons could be re-machined and used to make these airplane fragmentation bombs.
Boston, for the manufacture of rough machined gun forgings of the larger mobile calibers.
The contracts for the finished machined and assembled shell were placed with the General Motors Corporation at its Saginaw (Mich.
The first machined barrels reached the Lupton plant in June and found bases ready for them.
Cleveland, made the die-cast alloy pistons and machined them up to grinding.
In order to have recuperators available for use for the units shipped from the United States minus these mechanisms, 110 rough-machined recuperator forgings were shipped to France, where the work of machining and completing was done.
This must be bored and machined out until it weighs, with the accessory parts of the complete recuperator placed on the scales with it, only 870 pounds.
A satisfactory physical condition having been determined by pulling and breaking the test pieces described, the whole forging is sent to the finishing shop where it is machined to a mirror polish on all its surfaces.
Rock Island Arsenal, 10 machined barrels per day; and the Crane Co.
This factory was entirely built and equipped on Government land with Government money and is splendidly able to produce rough machined gun forgings of the highest quality at the rate of two sets a day for the 155-millimeter G.
It was only one times ten to the minus five of a gravity that the four by four by half inch piece of carefully machined plastic presented to the sixty-four million pound mass of Space Lab One.
Machined or forged steel parts are packed with case-hardening material in metal boxes and subjected to a red heat.
The pins are then allowed to cool slowly from the carbonizing heat, after which the hole is finish-machined and the pin cut to length.
The connecting rods for the first few Liberty engines were machined with sharp corners at the point where the connecting-rod bolt-head fits on assembly.
During this time, however, the condition of the blanks as they come to the machine shop to be machined has not received its share of attention.
To produce rods in this manner in any quantity, it is necessary for the final heat treatment to be made on the semi-machined rod.
Tools machined from such stock, and hardened with the utmost care, will have the best chance to survive without warping, growth or cracking.
If the die is for a forging which is machined all over and does not have to be especially close to size, where a variation of 1/16 in.
This practice would make it necessary for a larger percentage of the semi-machined rods to be cold-straightened after the finish heat treatment.
After having chosen a suitable steel it is best to have the sample analyzed by reliable chemists and also to have test pieces machined and pulled.
Whether to cast the impressions in the die-blocks, or to machine them out in toto, and if machined out how to do so, are further knotty propositions.
When setting a part in a chuck, care should be taken to so locate it that every surface to be turned will be true when machined to the finished size.
Parts which are to be machined in large quantities are often held in special fixtures.
B) Turning a Cylindrical Surface] Most of the parts machined in a vertical boring mill are made of cast iron and, ordinarily, at least one roughing and one finishing cut is taken.
A flywheel should preferably be machined on a double-head mill so that one side and the periphery of the rim can be turned at the same time.
This casting is now machined approximately to size.
The work being machined is held stationary in the multiple chuck turret A which holds each part in line with one of the spindles and automatically indexes, so that the work passes from one spindle to another until it is finished.
Work that is to be turned or bored should first be set so that the part to be machined is about central with the table.
The clips are set in this way after the first part has been machined to the required size and before disturbing the final position of the tools.
This may be desirable because of the shape and size of the work, or because it is necessary to hold a previously machined surface directly against the table in order to secure greater accuracy.
Brass or bronze is usually machined dry, although lard oil is sometimes used for automatic screw machine work.
When the machine is in operation, the cutter or tool revolves with the spindle sleeve or spindle and either the cutter or the part being machined is given a feeding movement, depending on the character of the work.
The part to be turned is a hub casting for an automobile and it is machinedin two series of operations.
By turning the fixture and not changing the position of the casting after it is bolted into place, the various surfaces aremachined in the correct relation to one another without difficulty.
The large part of the rod and central collar are then turned to size, this half being machined while the small part is in the rough and as stiff as possible.
Much of the work done by a vertical mill could also bemachined in a lathe, but the former is much more efficient for work within its range.
The aluminum-bronze castings were obtained and properly machined to fit the tubes, but when it was attempted to “tin” the interior walls of the thimbles it was found that the solder could not be made to stick to the bronze.
Entering the side of the cylinder near the top, was the combustion chamber, machined out of a solid steel forging, which also formed the port which entered the cylinder and was fastened to it by brazing.
This is the process which relieves all internal strains and distortion in the metal and softens it so that it may more easily be cut, machinedor bent to the required form.
Hardened steel may be softened and annealed so that it can be machined by connecting the dies of the welder to each side of the point to be softened.
These rods have a high silicon content, the silicon reacting with the carbon in the iron to produce a softer and more easily machined weld than would otherwise be the case.
Wrought iron is used for making bars to be machined into various parts.
The process of heat-treating steel forgings before they are machined is one of the most scientific and accurate features in the manufacture of this car.
These show signs of contained moisture when the bulk of the sheet is perfectly dry, and as undue delay would otherwise result these moist strips are trimmed and either returned to the smoke-house, or machined to form crepe.
The pieces are then machined into crepe form, but as no sodium bisulphite may have been used, the resulting rubber cannot be classed as No.
It may be taken to show that the machined rubber has been allowed to remain, either hanging or in piles, far too long before entering the smoke-house.
The trouble with it is that the swelling on the top and inside of the rails must be machined down to present a smooth running surface to the wheels.
At the end the weld is very rough but when it is machineddown it may be so perfect that it is difficult to tell where it was made, and the strength is equal to that of any other part of the piece.
Of course the sleeves, which are made of Swedish iron, a very fine material for cylinder construction, are machined down inside and out so that they are perfectly smooth to run upon each other.
The sliding door to my cell opened on noiseless machined slides.
Embroidery with scalloped or pointed edging should be machined strongly all round the extreme edges, the machine needle patiently following the circuitous course of the pattern.
Illustration: A Patchwork Cloth made with “pieces” machined together and finished with some narrow insertion.
Illustration: An effective design for silk patchwork: black and white squares, machinedor quilted diagonally in green.
These are joined together to make a long strip, and the whole is finished with a 1¾ inch hem of blue print, which is machined on.
A Modern Spinning Lathe] The central hub A should be machined first; then the assembled outside shell should be machined to fit the hub A, both on the taper part and at the point D.
This outer shell should also be machined all over the inside so that it will be in balance.
As will be seen, the larger ones are machined out in the back to lighten them, and also to give them an even balance.
This alloy is so hard that it cannot be machined or drilled by ordinary means; it must be treated by emery or carborundum wheels.
