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The hole pattern is a square with holes along the sides only, holes are every 100 mm along the edges, and there are no holes in the square. The bracket is two strips that fit either the left and right or the top and bottom row of holes, and the holes along the two other edges of the square are not used at the same time.
As most of these early round coins had round holes, the first "true" cash coins were the Yi Hua (一化) produced by the State of Yan. [ 4 ] [ 5 ] Apart from two small and presumably late coins from the State of Qin, coins from the spade money area have a round hole and refer to the jin and liang units.
Many squares are made of two parts, a stock and a straight blade or tongue. [2] The stock is usually thicker than the blade, with the blade being fixed into or onto the stock. The blade typically has parallel edges. The stock is usually held against the edge of a workpiece or drawing board and the tongue is then used as a straight edge for ...
Fillet (mechanics) In mechanical engineering, a fillet (pronounced / ˈfɪlɪt /, like "fill it") is a rounding of an interior or exterior corner of a part. An interior or exterior corner, with an angle or type of bevel, is called a "chamfer". Fillet geometry, when on an interior corner is a line of concave function, whereas a fillet on an ...
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.
The flat faces are used to dress the ends of the frets, removing the sharp edges left after the frets are trimmed to length. Half round ring files taper in width and thickness, coming to a point, and are narrower than a standard half round. Used for filing inside of rings. Joint round edge files are parallel in width and thickness, with rounded ...
Film perforations. Film perforations, also known as perfs and sprocket holes, are the holes placed in the film stock during manufacturing and used for transporting (by sprockets and claws) and steadying (by pin registration) the film. Films may have different types of perforations depending on film gauge, film format, and intended usage.
A spotface or spot face is a machined feature in which a certain region of the workpiece (a spot) is faced, providing a smooth, flat, accurately located surface. This is especially relevant on workpieces cast or forged, where the spotface's smooth, flat, accurately located surface stands in distinction to the surrounding surface whose roughness ...