TWO:In planing and turning, the tools require no exact form; they can be roughly made, except the edge, and even this, in most cases, is shaped by the eye. Such tools are maintained at a trifling expense, and the destruction of an edge is a matter of no consequence. The form, temper, and strength can be continually adapted to the varying conditions of the work and the hardness of material. The line of division between planing and milling is fixed by two circumstancesthe hardness and uniformity of the material to be cut, and the importance of duplication. Brass, clean iron, soft steel, or any homogeneous metal not hard enough to cause risk to the tools, can be milled at less expense than planed, provided there is enough work of a uniform character to justify the expense of milling tools. Cutting the teeth of wheels is an example where milling is profitable, but not to the extent generally supposed. In the manufacture of small arms, sewing machines, clocks, and especially watches, where there is a constant and exact duplication of parts, milling is indispensable. Such manufactures are in some cases founded on milling operations, as will be pointed out in another chapter.
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TWO:(1.) What peculiarity belongs to the operation of forging to distinguish it from most others?(2.) Describe in a general way what forging operations consist in.(3.) Name some machines having percussive action.(4.) What may this principle of operating have to do with the framing of a machine?(5.) If a steam-hammer were employed as a punching-machine, what changes would be required in its framing?(6.) Explain the functions performed by a hand-hammer.
FORE:Just as she was, with her lace and silks and long flowing train, Leona Lalage raced down the garden. With a bitter little smile she wondered what her Society friends would say if they could see her at this moment. The thorns of a rose bush caught a drooping mass of frippery and tore it away, but the woman paid no heed. Her dressmaker's bill need never be paid.
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FORE:
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FORE:And leaves us with Plotinus and pure souls.
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FORE:"Oh, mother," she cried. "What is the matter? What have they been doing to you?""Good night, my darling," he said, as he kissed her fondly. "You'll be compelled to leave here tomorrow, and I only hope the child will be better. Thank goodness, Gilbert Lawrence will be only too glad to have you."
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FORE:"I shall not slip through your fingers in the same way as before," said Leona. "I flatter myself I did you very neatly when you called upon me in Lytton Avenue. But all the same I am going to escape you."
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FORE:Next in order are strains. As the cutting action is the source of strains, and as the resistance offered by the cutting tools is as the length or width of the edges, it will be found in the present case that while other conditions thus far have pointed to small proportions, there is now a new one which calls for large proportions. In displacing the metal between teeth of three-quarters of an inch pitch, the cutting edge or the amount of surface acted upon is equal to a width of one inch and a half. It is true, the displacement may be small at each cut, but the strain is rather to be based upon the breadth of the acting edge than the actual displacement of metal, and we find here strains equal to the average duty of a large planing machine. This strain radiates from the cutting point as from a centre, falling on the supports of the work with a tendency to force it from the framing. Between the rack and the crank-shaft bearing, through the medium of the tool, cutter bar, connection, and crank pin, and in various directions and degrees, this strain may be followed by means of a simple diagram. Besides this cutting strain, there are none of importance; the tension of the belt, the side thrust in bearings, the strain from the angular thrust of the crank, and the end thrust of the tool, although not to be lost sight of, need not have much to do with problems of strength, proportion, and arrangement.
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FORE:"In Cherath she saved the life of a good many. As it was alleged that there had been shooting, the priest, the chaplain, a retired priest, eighty years old, the mayor, and several leading citizens were condemned to be shot. None, not even the priest, was able to defend himself, as they knew not a word of German, and could not make themselves understood. Mrs. de Villers, who speaks German fluently, explained that the spot where the shooting was alleged to have taken place was not part of Cherath at all.
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FORE:The signal went forward.Gifford murmured something about the honour and pleasure. There was no vehicle to be seen in the dark street besides the gleaming mass of brass and steel that quietly simmered by the pavement.
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