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A list, usually tabular and often on the drawing (if not accompanying the drawing on a separate sheet), listing the parts needed in an assembly, including subparts, standard parts, and hardware. There is no consistently enforced distinction between an L/M, a BoM, or a P/L. PLM: product lifecycle management; plant lifecycle management: See also ...
A bead is a small, decorative object that is formed in a variety of shapes and sizes of a material such as stone, bone, shell, glass, plastic, wood, or pearl and with a small hole for threading or stringing. Beads range in size from under 1 millimeter (0.039 in) to over 1 centimeter (0.39 in) in diameter.
Two principal techniques are used to produce seed beads: the wound method and the drawn method. The wound method is the more-traditional technique, is more time-consuming, and is no longer used in modern bead production: in this technique, a chunk of glass known in glassmaking as a gather and composed mainly of silica is heated on an iron bar until molten.
After the bead is slowly cooled, it is removed from the rod, resulting in a hole for eventual stringing as jewelry. Wedding cake beads known as Fiorato (decorated with glass overlays featuring roses, swirls and dots) and Venetian foil beads (with fusion of color, gold and silver foil) are two of the kinds of beads made using the lamp-work method.
The bead with its design than has to be fired at the proper temperature, not too hot lest the beads fractures, but hot enough so as to permit the chemical etching of the carnelian stone. [10] The result design comes out beautifully white, usually with some surface calcinated residues which can be easily brushed away.
Wampum beads are typically tubular in shape, often a quarter of an inch long and an eighth of an inch wide. One 17th-century Seneca wampum belt featured beads almost 2.5 inches (65 mm) long. [1] Women artisans traditionally made wampum beads by rounding small pieces of whelk shells, then piercing them with a hole before stringing them.