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Patterns used in sand casting may be made of wood, metal, plastics or other materials. Patterns are made to exacting standards of construction, so that they can last for a reasonable length of time, according to the quality grade of the pattern being built, and so that they will repeatably provide a dimensionally acceptable casting. [3]
It can leave an inset panel free to expand or contract with temperature and humidity. Cable moulding or ropework: Convex moulding carved in imitation of a twisted rope or cord, and used for decorative mouldings of the Romanesque style in England, France and Spain and adapted for 18th-century silver and furniture design (Thomas Sheraton) [4] [5]
Art Nouveau frieze with festoons, bordered at the top by a bead and reel strip, in Calea Dorobanților no. 50A, Bucharest, Romania, unknown architect or sculptor, c.1900 Art Deco bead and reel on Piața Mihail Kogălniceanu no. 1, Bucharest, unknown architect or sculptor, c. 1930
If the volume is large, then the pattern can be mass-produced by a process similar to injection molding. Pre-expanded beads of polystyrene are injected into a preheated aluminum mold at low pressure. Steam is then applied to the polystyrene which causes it to expand more to fill the die. The final pattern is approximately 97.5% air and 2.5% ...
The sand is allowed to sit on the pattern for a few minutes to allow the sand to partially cure. The pattern and sand are then inverted so the excess sand drops free of the pattern, leaving just the "shell". Depending on the time and temperature of the pattern the thickness of the shell is 10 to 20 mm (0.4 to 0.8 in).
Egg-and-dart molding at the top of an Ionic capital at the Jefferson Memorial. Egg-and-dart, also known as egg-and-tongue, egg-and-anchor, or egg-and-star, [1] is an ornamental device adorning the fundamental quarter-round, convex ovolo profile of moulding, consisting of alternating details on the face of the ovolo—typically an egg-shaped object alternating with a V-shaped element [1] (e.g ...