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Doraemon hindi hd episodes free download. OTHERS Download Rukmani ALP Basic Science and Engineering Drawing Pdf Download Rukmani ALP Technician ITI Trade Theory Mechanical Pdf Download Download Other • • • • • • Share it as much as you can! सरकारी परीक्षा या प्रतियोगी परीक्षा की तैयारी करने हेतु और नवीनत्तम करंट अफेयर्स Important GK in Hindi/English OR Free PDF को सबसे पहले पाने के लिए हमें Page पर अवश्य Like करें प्रिय पाठकों अगर आपको किसी भी प्रकार का सवाल या किसी अन्य E-BOOK की आवश्यकता है तो आप नीचे दिए गये comment box में अपना सुझाव दे सकते हैं. अगर आपको हमारी पोस्ट पसंद आ रही है तो आप इसे अपने दोस्तों के साथ SHARE जरूर करें. Detail of a double-cut flat file showing cutting surfaces milled on both wide and narrow faces A file is a used to remove fine amounts of material from a workpiece. It is common in,, and other similar trade and hobby tasks. Most are, made of a bar of rectangular, square, triangular, or round cross-section, with one or more surfaces cut with sharp, generally parallel teeth. A narrow, pointed is common at one end, to which a handle may be fitted. A is a form of file with distinct, individually cut teeth used for coarsely removing large amounts of material. Files have also been developed with abrasive surfaces, such as natural or synthetic or, allowing removal of material that would dull or resist metal, such as. Contents • • • • • • • • • • • • History [ ] Early filing or (the distinction is, not etic) has prehistoric roots and grew naturally out of the blending of the twin inspirations of cutting with stone cutting tools (such as ) and using natural abrasives, such as well-suited types of stone (for example, ). Relatedly, is also quite ancient, with and beach offering a natural pair of lap and lapping compound. The Disston authors state, 'To abrade, or file, ancient man used sand, grit, coral, bone, fish skin, and gritty woods,—also stone of varying hardness in connection with sand and water.' The and the had various kinds of files and rasps. Archaeologists have discovered rasps made from bronze in Egypt, dating back to the years 1200–1000 BC. Archaeologists have also discovered rasps made of iron used by the Assyrians, dating back to the 7th Century BC. During the files were already quite advanced, thanks to the extensive talents of. By the 11th century, there already existed files that would seem quite modern even to today's eyes. But although they existed, and could even have spread widely, in a geographical sense, via, they were not widespread in the cultural sense of the word—that is, most people, and even many, did not have them. For example, in the 13th century, ornamental iron work at was done skillfully with the aid of files, but known only to a master craftsman. The Disston authors state, 'It was not until the fourteenth century, however, that those who practiced art in ironwork began to use other tools, besides heat and the hammer, regularly.' This statement could mislead in the sense that stoning (with sandstone) and lapping (with wood, sand, and water) have never been rare activities among humans, or especially smiths. But the point is that modern iron or steel files, with teeth and hardening, and the of intricate filing that would lead to and, for example, are what took time to become common. But by the, however, the transition was extensive. The Disston authors mention,, and (they use the Reimscheid spelling) as leading centers of production for files as well as tools in general. The activity in Remscheid reflects the metalworking spirit of the region in general (including,, and ) rather than representing a single village of geniuses in isolation. (Considering the Disston authors' mention of the blacksmith guilds of 13th-century and 15th-century England, coupled with their mention of,, and, the region that sweeps from Florence through Nuremberg, the Rhine-Ruhr, the Netherlands, and up to Sheffield, can be compared to the modern economics notation of the.) Most files of the period were smithed by hand in a sequence in which the iron was (heated and hammered), then the teeth were cut with a (some of this action was just as much / as it was cutting), and then the piece was (by heating and then ), followed sometimes. Among the drawings of is a sketch of a for the cutting of files (the chisel would make one strike, a tooth, then automatically advance into position for the next tooth, and strike again). Prior to the industrialization of and the development of during the 19th century, filing was much more important in the construction of. Component parts were roughly shaped by,, and by primitive operations. These components were then individually hand-fit for assembly by careful and deliberate filing. The potential precision of such is much higher than generally assumed, but the components of such hand-fit assemblies are decidedly not interchangeable with those from another assembly.,, and (flintlocks and earlier) were manufactured in this way for centuries before the. In the mid-19th century was heavily dependent on filing, because practice was slowly evolving out of its infancy. Iti Fitter Trade Theory Pdf Free Download In Hindi FullAs late as the early 20th century, often involved filing parts to precise shape and size. In today's manufacturing environment, milling and grinding have generally replaced this type of work, and filing (when it occurs at all) usually tends to be for only. Skillful filing to shape and size is still a part of, but even in those fields, the goal is usually to avoid handwork when possible. Relative tooth sizes for smooth, 2nd cut and bastard files Files come in a wide variety of materials, sizes, shapes, cuts, and tooth configurations. The cross-section of a file can be flat, round, half-round, triangular, square, knife edge or of a more specialized shape. Steel files are made from (1.0 to 1.25% carbon) and may be through hardened. There is no unitary international standard for file nomenclature; however, there are many generally accepted names for certain kinds of files. A file is 'blunt' if its sides and width are both parallel throughout its length. It is 'tapered' if there is a reduction in its dimensions from its heel toward its point. A file may taper in width, in thickness, or both. A ' is a protrusion at the heel, tapered, parallel sided, or conical, for gripping, inserting in a handle, or mounting in a chuck. The cut of the file refers to how fine its teeth are. They are defined as (from roughest to smoothest): rough, middle, bastard, second cut, smooth, and dead smooth. A single-cut file has one set of parallel teeth while a cross-cut or double-cut file has a second set of cuts forming diamond shaped cutting surfaces. In Swiss-pattern files the teeth are cut at a shallower angle, and are graded by number, with a number 1 file being coarser than a number 2, etc. Most files have teeth on all faces, but some specialty flat files have teeth on only one face or one edge, so that the user can come right up to another edge without damaging the finish on it.
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