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When sheet metal is bent, it stretches in length. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend. The bend radius refers to the inside radius. The formed bend radius is dependent upon the dies used, the material properties, and the material thickness.
Roll bending may be done to both sheet metal and bars of metal. If a bar is used, it is assumed to have a uniform cross-section, but not necessarily rectangular, as long as there are no overhanging contours, i.e. positive draft. Such bars are often formed by extrusion. The material to be shaped is suspended between the rollers.
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In the absence of a qualifier, the term bending is ambiguous because bending can occur locally in all objects. Therefore, to make the usage of the term more precise, engineers refer to a specific object such as; the bending of rods , [ 2 ] the bending of beams , [ 1 ] the bending of plates , [ 3 ] the bending of shells [ 2 ] and so on.
A bar folder is a simplified brake, usually much smaller than a cornice or box-and-pan brake. Typically, a single handle both clamps the workpiece and makes the bend, in a single motion. There is a gauge that can be set up to a depth up to one inch for consistent bends.
Fanny Brate's 1901 A Day of Celebration shows two girls decorating a table; the background is a painting of an undecorated medieval table surround by waiting diners.. Early dining tables were purely functional; the term "setting the table" originated in the middle ages to describe setting a board on two trestles to provide a temporary surface on which to set food. [4]
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The metal chandeliers may have a central support with curved or S-shaped arms attached, and at the end of each arm is a drip-pan and nozzle for holding a candle; by the 15th century, candle nozzles were used instead of prickets to hold the candles since candle production techniques allowed for the production of identically sized candles. [34]