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Modern bezel settings typically use a band of metal containing a groove and a flange (i.e. projecting lip) to hold a watch crystal or gemstone in its setting. This was the earliest method of setting gemstones into jewelry. In historic examples, such rings were often made by leaving a hole or slot in the ring with a thin lip which was bent over ...
The first chevron beads were made towards the end of the 15th century, consisting of 7 layers of alternating colours. They usually have 6 facets. Unlike their later counterparts, they were not always made with the standard 12-point star mould. By the beginning of the 20th century, 4 and 6-layer chevron beads appear on various sample cards.
A 'triblet' is a type of mandrel found in jewelry manufacturing [1] that is not inserted into or held by a machine. Such mandrels vary in sizes and shapes, from small tapered metal rods (ring mandrels) to freestanding metal conic sections (used for making bracelets). Unlike with mechanical mandrels, the process is performed by hand.
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The lifting rod system ran vertically up the mineshaft, either to transfer power to the individual sets of shaft pumps (when they were known as pump rods) or, in the case of man engines, to operate the man engine rods. In some cases the lifting rod system performed both duties. It consisted of roughly 19 to 20 centimetre thick squared spruce ...
The ends of a digging bar are shaped for various purposes. [3] Typically, each end has a different shape so as to provide two different tool functions in one tool. Common end shapes include: Blunt — a broad, blunt surface for tamping. Point — for breaking hard materials and prying. Wedge — an unsharpened blade for digging, breaking and ...
In metalworking and jewelry making, casting is a process in which a liquid metal is delivered into a mold (usually by a crucible) that contains a negative impression (i.e., a three-dimensional negative image) of the intended shape. The metal is poured into the mold through a hollow channel called a sprue.
Bar stock, also (colloquially) known as blank, slug or billet, [1] is a common form of raw purified metal, used by industry to manufacture metal parts and products. Bar stock is available in a variety of extrusion shapes and lengths. The most common shapes are round (circular cross-section), rectangular, square and hexagonal.
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