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    Software name: 网络彩票名片
    Software type: Microsoft Framwork

    Software size : 546 MB

    soft time:2021-01-24 16:15:13

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      �ワぐdイ�づReciprocating tools are divided into those wherein the cutting movement is given to the tools, as in shaping and slotting machines, and machines wherein the cutting movement is given to the material to be planed, as in a common planing machine. Very strangely we find in general practice that machine tools for both the heaviest and the lightest class of work, such as shaping, and butting, operate upon the first principle, while pieces of a medium size are generally planed by being moved in contact with stationary tools.辘ぅ

      Symmetry, as an element in designs for machinery, is one of those unsettled matters which may be determined only in connection with particular cases; it may, however, be said that for all engineering implements and manufacturing machinery of every kind, there should be nothing added for ornament, or anything that has no connection with the functions of the machinery.イ僻ポ螗ぅ� 汨4. The cost of construction and durability.其イ椁垄ぇ睿

      网络彩票名片

      Suddenly I saw a boy about twelve years old in one of the burning streets. He waved his arms, rushed madly to and fro, calling for his father and mother, and his little brother and sisters. He was in danger of perishing in the fire, or being killed by the murderous bullet from a rifle. I ran after him, laid hold of him, and in spite of his resistance pulled him back. Fortunately I met a couple of kind, sober soldiers to whom I told the story, and who promised to send the boy away from the burning town.葸Δ荬盲イCHAPTER XL. INVENTION.いゥ款ォIn respect to lathe manipulation, which is perhaps the most difficult to learn of all shop operations, the following hints are given, which may prove of service to a learner: At the beginning the form of tools should be carefully studied; this is one of the great points in lathe work; the greatest distinction between a thorough and indifferent latheman is that one knows the proper form and temper of tools and the other does not. The adjustment and presenting of tools is soon learned by experience, but the proper form of tools is a matter of greater difficulty. One of the first things to study is the shape of cutting edges, both as to clearance below the edge of the tool, and the angle of the edge, with reference to both turning and boring, because the latter is different from turning. The angle of lathe tools is clearly suggested by diagrams, and there is no better first lesson in drawing than to construct diagrams of cutting angles for plane and cylindrical surfaces.ヲ暮ッケ

      On the same day I wrote as follows about Dr. Goffin:—悚ぅぅきAs darkness was coming on I asked him whether it was not dangerous to pass the night in the house of that little old man, whom I mentioned above. He saw nothing dangerous in it, as by far the greater part of the town was deserted, and no attack need be feared.ょ扦ゥMy stories are not exaggerated or touched up, but are true to reality. That is the reason why the German authorities have driven me away from Belgium, and tried to get hold of me to punish me. On that side they are afraid that the truth be known.ヅ

      The wind seemed to play with the smoke, rolling dense volumes down the slopes which dispersed only when they reached the bank along the river. Whilst the flames soared high up from the roofs, the walls of the houses stood still erect, and everywhere in the windows one saw those miserable little white flags, symbols of submission, mute prayers75 that submission should be rewarded by sparing the life and possession of the inhabitants....ゥノ顶c�ノAs remarked in the case of other machines treated of, there is no use of describing the mechanism of trip-hammers; it is presumed that every engineer apprentice has seen trip-hammers, or can do so; and the plan here is to deal especially with what he cannot see, and would not be likely to learn by casual observation.

      网络彩票名片

      �礵イ菠互�ゥゥThe most perfect castings for gear wheels and pulleys and other pieces which can be so moulded, are made by drawing the patterns through templates without rapping. These templates are simply plates of metal perforated so that the pattern can be forced through them by screws or levers, leaving the sand intact. Such templates are expensive to begin with, because of the accurate fitting that is required, especially around the teeth of wheels, and the mechanism that is required in drawing the patterns, but when a large number of pieces are to be made from one pattern, such as gear wheels and pulleys, the saving of labour will soon pay for the templates and machinery required, to say nothing of the saving of metal, which often amounts to ten per cent., and the increased value of the castings because of their accuracy.洹げ遑

      �讦ゥゥテイIn respect to lathe manipulation, which is perhaps the most difficult to learn of all shop operations, the following hints are given, which may prove of service to a learner: At the beginning the form of tools should be carefully studied; this is one of the great points in lathe work; the greatest distinction between a thorough and indifferent latheman is that one knows the proper form and temper of tools and the other does not. The adjustment and presenting of tools is soon learned by experience, but the proper form of tools is a matter of greater difficulty. One of the first things to study is the shape of cutting edges, both as to clearance below the edge of the tool, and the angle of the edge, with reference to both turning and boring, because the latter is different from turning. The angle of lathe tools is clearly suggested by diagrams, and there is no better first lesson in drawing than to construct diagrams of cutting angles for plane and cylindrical surfaces.ち徇蓼�リ垧

      Machines with direct action, such as punches, shears, or rolls, require first a train of mechanism of some kind to reduce the motion from the driving power so as to attain force; and secondly, [105] this force must be balanced or resisted by strong framing, shafts, and bearings. A punching-machine, for example, must have framing strong enough to resist a thrust equal to the force applied to the work; hence the frames of such machines are always a huge mass, disposed in the most advantageous way to meet and resist this reactive force, while the main details of a drop-machine capable of exerting an equal force consist only of a block and a pair of guides to direct its course.いゥ嵋(1.) Name the different departments of an engineering establishment.—(2.) What does the engineering establishment include?—(3.) What does the commercial department include?—(4.) The foundry department?—(5.) The forging department?—(6.) The fitting department?—(7.) What does the term shop system mean as generally employed?るぅ舭幛イゴ�啷胎い倒

      网络彩票名片

      "Well, sir, I wanted to follow, as far as the German Authorities desire to allow it, the movements of the German armies, in order to give reliable information to the Netherland public, who take a great interest in your progress."フ┊抡戛�攒О绀ギThe men stopped their horses, dismounted, and returned the fire from behind their animals. This went on for about a quarter of an hour. Every one was alarmed by this shooting; other soldiers came racing in from the station, and others ran to and fro near that building crying, "A surprise attack!" Some, thinking that the attack came from the advancing Belgians, rushed to the place where the fighting took place, others misunderstood the cry, believed that the citizens assaulted them, and began to shoot at these, and at the houses.1浃い氍趣エ

      Between my tours through the Liège district I made a trip in the direction of Tongres, because I wanted to know what had become of all those Germans who had crossed the Meuse near Lixhe. It was remarkable to notice how friendly the Flemings of that district behaved with regard to the Germans. Although they criticised the violation of the country's neutrality sharply, and every family was proud of the sons who had taken up arms in defence of their Fatherland, yet they judged quite kindly the German soldiers who passed through their district. I often heard expressions full of pity toward those men, who could not help themselves, but were compelled to do whatever their superiors commanded them.缒い互48テ�昆ぅぅ堀


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        2021-01-24 16:15:13