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42-556: A rasp is a coarse form of file used for coarsely shaping wood or other material. Typically a hand tool , it consists of a generally tapered rectangular, round, or half-round sectioned bar of case hardened steel with distinct, individually cut teeth. A narrow, pointed tang is common at one end, to which a handle may be fitted. Rasps come in a variety of shapes—rectangular, round, and half-round—and vary in coarseness from finest, "cabinet", to most aggressive, "wood". Farriers , for example, commonly use rasps to remove excess wall from

84-422: 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

126-495: A geographical sense, via trade , they were not widespread in the cultural sense of the word—that is, most people, and even many smiths , did not have them. For example, in the 13th century, ornamental iron work at Paris was done skillfully with the aid of files, but the process was a secret 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

168-439: A horse's hoof. They are also used in woodworking for rapidly removing material and are easier to control than a drawknife . The rough surfaces they leave may be smoothed with finer tools, such as single- or double-cut files. Rasps are used in shaping alabaster . Saws and chisels are used to rough out alabaster work. This tool article is a stub . You can help Misplaced Pages by expanding it . File (tool) A rasp

210-664: A single village of geniuses in isolation. (Considering the Disston authors' mention of the blacksmith guilds of 13th-century Florence and 15th-century England, coupled with their mention of Nuremberg , Sheffield , and Remscheid , 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 Blue Banana .) Most files of

252-518: A standard steel file is ineffective. Diamond files are also the only type that may be used with a back-and-forth motion without damaging the file. These may also be called diamond laps , as the "teeth" are not regular projections, as in a file, but particles, usually shaped and located randomly and held in place by a softer (any other) material. The image to the left shows a selection of needle files in an assortment of cross sectional shapes. Needle files are small files that are used in applications where

294-695: A unified presentation. Cities and urban areas within it often pursue separate investment policies against each other. From within, Düsseldorf, Essen, and Cologne are by far the largest economic centers, with specialisation in financial/high tech and insurance/multi media services respectively. Other major economic centers are Bonn and Dortmund. The region is home to twelve Fortune Global 500 companies, among them E.ON AG (Essen), Deutsche Post AG (Bonn), Metro AG (Düsseldorf), Deutsche Telekom AG (Bonn), ThyssenKrupp AG (Essen), RWE AG (Essen), Bayer AG (Leverkusen), Franz Haniel & Cie. GmbH (Duisburg), Evonik Industries (Essen), Hochtief AG , (Essen), and

336-580: 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 " tang " 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

378-414: 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 diamond grains or silicon carbide , allowing removal of material that would dull or resist steel files, such as ceramic . Early filing or rasping has prehistoric roots and grew naturally out of the blending of

420-581: Is home to nine universities and over 30 partly postgraduate colleges , with a total of over 300.000 students. The largest and oldest university is the University of Cologne (Universität zu Köln) , founded in 1388 AD. Other universities include: The following register lists all municipalities that officially belong to Rhine-Ruhr area. Demographically, these municipalities include 20 cities (German: Kreisfreie Städte ) each with more than 100,000 inhabitants , and 11 districts (German: Kreis ), each with

462-513: Is much higher than generally assumed, but the components of such hand-fit assemblies are decidedly not interchangeable with those from another assembly. Locks , clocks , and firearms (flintlocks and earlier) were manufactured in this way for centuries before the Industrial Revolution . Machining in the mid-19th century was heavily dependent on filing, because milling practice was slowly evolving out of its infancy. As late as

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504-511: Is the largest metropolitan region in Germany , with over ten million inhabitants. A polycentric conurbation with several major urban concentrations, the region covers an area of 7,110 square kilometres (2,750 sq mi), entirely within the federal state of North Rhine-Westphalia . The Rhine-Ruhr metropolitan region spreads from the Ruhr area ( Dortmund - Bochum - Essen - Duisburg ) in

546-537: Is the most dense in all of Germany. The rail, S-Bahn, U-Bahn and bus companies are administered through a consortium of local and regional transport lines, the Verkehrsverbund Rhein-Ruhr . It offers a rapid transit system which interconnects all cities and their respective local buses, trams, U- and S-Bahn systems, partly under the umbrella of Deutsche Bahn. Their systems are highly integrated where even some subway lines continue from one city to

588-531: Is usually to avoid handwork when possible. 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 high carbon steel (1.0 to 1.25% carbon) and may be through hardened or case hardened . There is no unitary international standard for file nomenclature; however, there are many generally accepted names for certain kinds of files. A file

630-743: The Cologne and Düsseldorf carnivals (carnival is however a public event in almost all cities and towns of the area), the Cologne Comedy Festival , Ruhrfestspiele Recklinghausen, and the RuhrTriennale , as well as Gamescom and other trade fairs at Koelnmesse— Cologne Trade Fair and Messe Düsseldorf ; and Essen Motor Show in Essen. With a capacity of up to 20,000 people, the Lanxess Arena and Westfalenhallen are amongst

672-476: The European Route of Industrial Heritage . NRW Forum , Kunstsammlung Nordrhein-Westfalen , Kunsthalle Düsseldorf , Museum Koenig , Museum Ludwig , Romano-Germanic Museum , Wallraf-Richartz Museum , Neanderthal Museum , Museum Folkwang , Museum Ostwall , Lehmbruck Museum , German Mining Museum and Deutsches Museum Bonn are some of the most famous examples. The Rhine-Ruhr metropolitan region

714-553: The Frankfurt Rhine Main Region . The metropolitan area is named after the Rhine and Ruhr rivers, which are the region's defining geographical features and historically its economic backbone. The largest cities in the Rhine-Ruhr area are Cologne , with over one million inhabitants, followed by Düsseldorf , Dortmund and Essen , each of which has slightly more than 580,000. Many unofficial compositions of

756-671: The Henkel Group , (Düsseldorf). The Rhine-Ruhr area's climate is characterized by having the warmest winters in Germany, especially its western part at the Lower Rhine area. Classified by Köppen-Geiger climate classification to be oceanic (Cfb). The area has four international commercial airports, and several smaller aerodromes for general aviation . The network of Autobahns in North Rhine-Westphalia

798-781: The Iron Age 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 Middle Ages files were already quite advanced, thanks to the extensive talents of blacksmiths . By the 11th century, there already existed hardened files that would seem quite modern even to today's eyes. But although they existed, and could even have spread widely, in

840-576: The late Middle Ages , the transition was extensive. The Disston authors mention Nuremberg , Sheffield , and Remscheid (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 Rhine-Ruhr region in general (including Essen , Düsseldorf , and Cologne ) rather than representing

882-602: The 19th century the city of Düsseldorf grew to become the administrative center of the region and since 1945, its political capital. Today, the Rhine-Ruhr metropolitan region accounts for roughly 15% of the GDP of the German economy , which would place it as the 2nd largest metropolitan area GDP in the European Union . Despite this size, the Rhine-Ruhr region as a whole often lacks international competitiveness because it lacks

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924-570: The Rhine-Ruhr area differ from one another, while the officially defined border of the metropolitan area itself comprises Hamm in the east, Mönchengladbach in the west, Bonn in the south, with the small city of Wesel as its northernmost point. The northern border is similar to that of the Ruhr Area . This first unofficial table here characterizes the Rhine-Ruhr area as comprising three regions, which together constitute an area much larger than officially defined. Eurostat's Urban Audit splits

966-518: The Rhine-Ruhr region into six Larger Urban Zones (LUZ). None of these six Urban Zones includes the cities of Remscheid and Solingen or the district of Rhein-Kreis Neuss . Historically, most of the Ruhr area was for the most part characterized by heavy industry since the age of industrialisation in the late 19th and early 20th century. Since the Middle Ages, Cologne, Dortmund, and other cities were important regional trading cities, but during

1008-478: The clogging of the file teeth with pins , which are material shavings. These pins cause the file to lose its cutting ability and can scratch the workpiece. A file card , which is a brush with metal bristles, is used to clean the file. (The name, "card", is the same as used for the " raising cards " (spiked brushes) used in woolmaking.) Chalk can help prevent pinning. Rhine-Ruhr The Rhine-Ruhr metropolitan region ( German : Metropolregion Rhein-Ruhr )

1050-584: The cutting of files (the chisel would make one strike, swaging a tooth, then automatically advance into position for the next tooth, and strike again). Prior to the industrialization of machining and the development of interchangeable parts during the 19th century, filing was much more important in the construction of mechanisms . Component parts were roughly shaped by forging , casting , and by primitive machining operations. These components were then individually hand-fitted for assembly by careful and deliberate filing. The potential precision of such fitting

1092-404: The early 20th century, manufacturing 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 deburring only. Skillful filing to shape and size is still a part of diemaking, moldmaking, toolmaking, etc. , but even in those fields, the goal

1134-429: The file sideways instead of head on, and an extremely fine shaving action is produced. There are also varying strokes that produce a combination of the straight ahead stroke and the drawfiling stroke, and very fine work can be attained in this fashion. Using a combination of strokes, and progressively finer files, a skilled operator can attain a surface that is perfectly flat and near flawless finish. Pinning refers to

1176-488: The finish on it. Some of the common shapes and their uses: Instead of having teeth cut into the file's working surface, diamond files have small particles of industrial diamond embedded in their surface (or into a softer material that is bonded to the underlying surface of the file). The use of diamonds in this manner allows the file to be used effectively against extremely hard materials, such as stone, glass or very hard metals such as hardened steel or carbide against which

1218-438: 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 material culture of intricate filing that would lead to locksmithing and gunsmithing , for example, are what took time to become common. But by

1260-494: The largest indoor arenas in Germany. The region is home to a total of 13 Bundesliga football clubs, of which five are active in the season of 2017–18. The most successful among them are Borussia Dortmund , Borussia Mönchengladbach , 1. FC Köln , FC Schalke 04 and Bayer 04 Leverkusen . The Revierderby is the rivalry between Borussia Dortmund and Schalke 04, one of the most significant in German football. Westfalenstadion ,

1302-545: The major cities). Some excursions, theatre and opera tickets as well as museums offer free transportation from any point in the Rhine Ruhr area to the venue and return. Duisburg Inner Harbour (Duisport) and Dortmund Port are large industrial inland ports and serve as hubs along the Rhine and the German inland water transport system. The region is host to numerous large events, comprising fun fairs and cultural events like

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1344-441: The narrow canals of the interior of the tooth and thus facilitate disinfection of the internal surface. Typically the files are made of stainless steel or nickel titanium (NiTi) and come in a variety of styles. Mechanized files, known as rotary files, are also commonly used. These files attach to the head of a specific oscillating or rotating drill. Files have forward-facing cutting teeth, and cut most effectively when pushed over

1386-418: The next (for example between Düsseldorf and Duisburg or Bochum and Herne, which is unique in Germany, as the city border is crossed underground). The region is divided into several urban zones and fares are paid according to the amount of urban areas (or zones) passed through. Tickets include door to door transportation with all forms covered in one ticket with the exception of high speed rail (which only stops in

1428-611: The north to the urban areas of the cities of Mönchengladbach , Düsseldorf (the state capital), Wuppertal , Leverkusen , Cologne (the region's largest and Germany's fourth largest city), and Bonn in the south. The location of the Rhine-Ruhr at the heart of the European Blue Banana makes it well connected to other major European cities and metropolitan areas such as the Randstad , the Flemish Diamond and

1470-467: The order of approximately 100–140 mm (4–5 1 ⁄ 2 in.) in length and 3–5 mm ( 1 ⁄ 8 – 3 ⁄ 16 in.) in width. Best used for fine, delicate work on small pieces or mechanisms (such as escapements ), escapement files are commonly used by clock and watchmakers , as well as in crafting jewelry. During root canal therapy , round files ranging from .06-to-0.8-millimetre (0.0024 to 0.0315 in) diameter files are used to smooth

1512-401: The period were smithed by hand in a sequence in which the iron was forged (heated and hammered), then the teeth were cut with a chisel (some of this action was just as much upsetting / swaging as it was cutting), and then the piece was hardened (by heating and then quenching ), followed sometimes by tempering . Among the drawings of Leonardo da Vinci is a sketch of a machine tool for

1554-718: The stadium of Borussia Dortmund, is the biggest stadium in Germany. The area had plans to bid for the 2032 Summer Olympics, before the IOC declared Brisbane to be the host. Several tourist destinations within the region attract over 12 million tourists per year. Cologne Cathedral , Augustusburg and Falkenlust Palaces at Brühl and the Zollverein Coal Mine Industrial Complex at Essen are UNESCO World Heritage Sites . Other sights include Schloss Benrath in Düsseldorf and several anchor points of

1596-403: The surface finish of a cavity die may need to be improved, e.g. in plastic injection moulding or die casting . Files are produced specifically for use in a filing machine , which is similar in appearance to a scroll saw with a vertically reciprocating file mounted in the middle of a table. A workpiece is manipulated around the file's face as the shape requires. A cone point (as pictured in

1638-434: The surface finish takes priority over metal removal rates but they are most suited for smaller work pieces. They are often sold in sets, including different shapes. Riffler files are small to medium-sized files in an assortment of cross sectional shapes and profiles. The varying profiles and shapes enable them to be used in hard to reach, or unusually shaped areas. They are often used as an intermediate step in die making where

1680-577: The top and bottom files at left) allows a file to center itself in its mount. Files with flat mounting surfaces must be secured with set screws . Filing machines are rarely seen in modern production environments, but may be found in older toolrooms or diemaking shops as an aid in the manufacture of specialist tooling. Escapement files, also known as watchmaker's files, are a classification of short, (very) thin files with bastard-cut (medium coarseness) or embedded diamond surfaces, similar to needle files in form and function but smaller. Typical dimensions are on

1722-519: The twin inspirations of cutting with stone cutting tools (such as hand axes ) and abrading using natural abrasives, such as well-suited types of stone (for example, sandstone ). Relatedly, lapping is also quite ancient, with wood and beach sand 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 Bronze Age and

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1764-408: The workpiece. A variety of strokes are employed to stabilize the cutting action and produce a varied result. Draw filing is an operation in which the file is grasped at each end, and with an even pressure alternately pulled and pushed perpendicularly over the work. A variation involves laying the file sideways on the work, and carefully pushing or pulling it across the work. This catches the teeth of

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