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Reducing Machine
A Reducing Machine was a type of pantograph lathe used until the 21st century to manufacture coin dies. Prior to the machine's introduction, designs were cut by hand into metal dies by a specialist engraver. The reducing machine changed this by allowing artists to create designs on a larger surface area and then have them scaled down and cut into a die automatically. The most successful version of the machine, created by Victor Janvier, was used by mints all around the world including the US Mint who operated one as late as 2008 when it was replaced by CNC milling machines. History Contamin Pantograph From 1836 to 1867 the US Mint operated the first die-engraving pantograph invented by a now forgotten French inventor whom the machine is named after. It used a rotating cutter to copy a design. Hill Pantograph During the mid 1800s Englishman C. J. Hill developed a variation of the Contamin whereby the electrotype was traced horizontally using a treadle. Hill sold his idea to Wil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thinktank Birmingham - Object 1960S01284(1) - Janvier Reducing Lathe
A think tank, or policy institute, is a research institute that performs research and advocacy concerning topics such as social policy, political strategy, economics, military, technology, and culture. Most think tanks are non-governmental organizations, but some are semi-autonomous agencies within government or are associated with particular political parties, businesses or the military. Think-tank funding often includes a combination of donations from very wealthy people and those not so wealthy, with many also accepting government grants. Think tanks publish articles and studies, and even draft legislation on particular matters of policy or society. This information is then used by governments, businesses, media organizations, social movements or other interest groups. Think tanks range from those associated with highly academic or scholarly activities to those that are overtly ideological and pushing for particular policies, with a wide range among them in terms of the qual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pantograph
A pantograph (, from their original use for copying writing) is a mechanical linkage connected in a manner based on parallelograms so that the movement of one pen, in tracing an image, produces identical movements in a second pen. If a line drawing is traced by the first point, an identical, enlarged, or miniaturized copy will be drawn by a pen fixed to the other. Using the same principle, different kinds of pantographs are used for other forms of duplication in areas such as sculpting, minting, engraving, and milling. Because of the shape of the original device, a pantograph also refers to a kind of structure that can compress or extend like an accordion, forming a characteristic rhomboidal pattern. This can be found in extension arms for wall-mounted mirrors, temporary fences, pantographic knives, scissor lifts, and other scissor mechanisms such as the pantograph used on electric locomotives and trams. History The ancient Greek engineer Hero of Alexandria described pant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lathe
A lathe () is a machine tool that rotates a workpiece about an axis of rotation to perform various operations such as cutting, sanding, knurling, drilling, deformation, facing, and turning, with tools that are applied to the workpiece to create an object with symmetry about that axis. Lathes are used in woodturning, metalworking, metal spinning, thermal spraying, parts reclamation, and glass-working. Lathes can be used to shape pottery, the best-known design being the Potter's wheel. Most suitably equipped metalworking lathes can also be used to produce most solids of revolution, plane surfaces and screw threads or helices. Ornamental lathes can produce three-dimensional solids of incredible complexity. The workpiece is usually held in place by either one or two ''centers'', at least one of which can typically be moved horizontally to accommodate varying workpiece lengths. Other work-holding methods include clamping the work about the axis of rotation using a chuck or col ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Die (manufacturing)
A die is a specialized machine tool used in manufacturing industries to cut and/or form material to a desired shape or profile. Stamping dies are used with a press, as opposed to drawing dies (used in the manufacture of wire) and casting dies (used in molding) which are not. Like molds, dies are generally customized to the item they are used to create. Products made with dies range from simple paper clips to complex pieces used in advanced technology. Continuous-feed laser cutting may displace the analogous die-based process in the automotive industry, among others. Die stamping Blanking and piercing are two die cutting operations, and bending is an example of a die forming operation. Die forming Forming operations work by deforming materials like sheet metal or plastic using force (compression, tension, or both) and rely on the material's mechanical properties. Forming dies are typically made by tool and die makers and put into production after mounting into a press. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victor Janvier
Victor Janvier (1851–1911) was a French sculptor and engraver notable for inventing the Janvier Reducing Machine, a type of lathe which improved the die making process within mints A mint or breath mint is a food item often consumed as an after-meal refreshment or before business and social engagements to improve breath odor. Mints are commonly believed to soothe the stomach given their association with natural byproducts .... References 19th-century French sculptors 19th-century French inventors 1851 births 1911 deaths {{France-sculptor-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
US Mint
The United States Mint is a bureau of the Department of the Treasury responsible for producing coinage for the United States to conduct its trade and commerce, as well as controlling the movement of bullion. It does not produce paper money; that responsibility belongs to the Bureau of Engraving and Printing. The first United States Mint was created in Philadelphia in 1792, and soon joined by other centers, whose coins were identified by their own mint marks. There are currently four active coin-producing mints: Philadelphia, Denver, San Francisco, and West Point. History The Massachusetts Bay Colony established a mint in Boston in 1652. John Hull was Treasurer and mintmaster; Hull's partner at the "Hull Mint" was Robert Sanderson. The historical marker reads: The first authorization for the establishment of a mint in the United States was in a resolution of the Congress of the Confederation of February 21, 1782, and the first general-circulation coin of the United State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milling (machining)
Milling is the process of machining using rotary Milling cutter, cutters to remove material by advancing a cutter into a workpiece. This may be done by varying direction on one or several axes, cutter head speed, and pressure. Milling covers a wide variety of different operations and machines, on scales from small individual parts to large, heavy-duty gang milling operations. It is one of the most commonly used processes for machining custom parts to precise tolerances. Milling can be done with a wide range of machine tools. The original class of machine tools for milling was the milling machine (often called a mill). After the advent of computer numerical control (CNC) in the 1960s, milling machines evolved into ''machining centers'': milling machines augmented by automatic tool changers, tool magazines or carousels, CNC capability, coolant systems, and enclosures. Milling centers are generally classified as vertical machining centers (VMCs) or horizontal machining centers (HMCs) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Treadle
A treadle (from oe, tredan, "to tread") is a mechanism operated with a pedal for converting reciprocating motion into rotating motion. Along with cranks, treadmills, and treadwheels, treadles allow human and animal machine power in the absence of electricity. Before the widespread availability of electric power, treadles were widely used to power a range of machines. They may still be used as a matter of preference or in environments where electric power is not available. Operation and uses A treadle is operated by pressing down on its pedal with one or both feet, causing a rocking motion. This movement can then be stored as rotational motion via a crankshaft driving a flywheel. Alternatively, energy can be stored in a spring as in the pole lathe. Treadles were once used extensively to power most machines including lathes, rotating or reciprocating saws, spinning wheels, looms, and sewing machines. The last use was popularized by Elias Howe and Isaac Singer in the eponym ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Wyon
William Wyon (Birmingham 1795 – 29 October 1851), was official chief engraver at the Royal Mint from 1828 until his death. Biography Wyon was born in Birmingham and, in 1809, was apprenticed to his father, Peter Wyon who was an engraver and die sinker. In 1816, he went to London. He studied the works of John Flaxman, attended the schools of the Royal Academy, and gained a gold medal from the Society of Arts for a copy of the head of Ceres, and a second for an original group. In 1816 he was appointed assistant engraver to the mint, and in 1828 chief engraver. In 1831 he was elected associate and in 1838 full member of the Royal Academy. He died in Brighton, United Kingdom. Wyon is buried under a simple rectangular York stone slab at West Norwood Cemetery. He was the father of engraver Leonard Charles Wyon. Designs Under the influence of Flaxman, a master of relief sculpture, Wyon was a highly visible proponent of the Neoclassicist vogue. In 1834 he modelled the head of Pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Mint
The Royal Mint is the United Kingdom's oldest company and the official maker of British coins. Operating under the legal name The Royal Mint Limited, it is a limited company that is wholly owned by His Majesty's Treasury and is under an exclusive contract to supply the nation's coinage. As well as minting circulating coins for the UK and international markets, The Royal Mint is a leading provider of precious metal products. The Royal Mint was historically part of a series of mints that became centralised to produce coins for the Kingdom of England, all of Great Britain, the United Kingdom, and nations across the Commonwealth. The Royal Mint operated within the Tower of London for several hundred years before moving to what is now called Royal Mint Court, where it remained until the 1960s. As Britain followed the rest of the world in decimalising its currency, the Mint moved from London to a new 38-acre (15 ha) plant in Llantrisant, Glamorgan, Wales, where it has remained sin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Mint Museum
The Royal Mint Museum is a numismatics museum located in Llantrisant, Wales, which houses coins, medals, artwork and minting equipment previous owned by the Royal Mint. Although the museum is located on the same site as the Royal Mint, the mint and the museum are separate companies. In partnership with the mint, a new £9 million visitor centre was built to allow members of the public to view part of the museum's collection. History Following the privatisation of the Royal Mint in 2009, whereby it became a limited company, much of the mint's numismatic collection was separated into a separate entity now called the Royal Mint Museum. In November 2010 the museum gained charitable status. Collection *Battle of Waterloo Medal Roll *Unreleased Edward VIII pattern coins *A pre-decimal 1933 penny *Maria Theresa thaler *Elizabeth I gold sovereign ''Sovereign'' is a title which can be applied to the highest leader in various categories. The word is borrowed from Old French , which i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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