< MASTER PATTERN SUMMARY
PATTERN KEYWORDS
ARMATURE: An underlying support structure inside a pattern or model. Also used as a means of internally strengthening metal casts which are not sufficiently self supporting.
CAD/CAM: (abbr.) Computer Aided Design/ Manufacture.
CONTRACTION: Shrinkage of materials, usually upon cooling/setting, a feature of modelling wax, moulding rubbers and cast metals for example.
EPS: (abbr.) Expanded Polystyrene (Foam)
LOST PATTERN: A ‘disposable’ design, used directly in a foundry investment or sand mould to produce a ‘one off’ cast.
MAQUETTE: A scale model of a proposed artwork. Useful for presentation, evaluation and enlargement. A maquette is normally constructed to an scale relative to the full version artwork.
PATTERN: Also, master pattern, model, sculpture, template etc. The basis of any cast, a master pattern is usually supplied by the artist or designer to the foundry. A general term that applies to all patterns be they of the permanent or lost type.
MDF: (abbr.) Medium Density Fibreboard.
PATTERNMAKER: Craftsperson specialising in the construction of patterns (usually for commercial foundry work).
PERMANENT PATTERN: A model or master pattern used as a template for multiple reproduction. Permanent patterns are not directly used in the refractory mould and remain intact. To produce a wax copy for casting, the founder must first create a ‘negative impression’ reproduction mould, this is usually formed in a rubber compound.
POINTING: Means of scaling three dimensional works by transfering plotted points. Usualy done with the aid of a pantographic device which has adjustable ratio settings.
ROMAN JOINT: Traditional sculpting joint for locating and mating pattern parts with a high degree of accuracy. Effectively a male to female interlocking spigot.
SECTIONING: The process of identifying and making cut lines for dividing up a master pattern for moulding and casting.
JUTE SCRIM: A strong, open woven hessian type fabric supplied in rolls or sheets and used for reinforcing plaster layers.
SEASONING: Treatment of wood to reduce it’s moisture content, and therefore minimise warpage, shrinkage and other distortion in use.
SHIM: A fine metal strip (usually >1mm brass), used for dividing the sections of a plaster waste mould.
SLUSH CAST: Creating a reproduction (usually in wax. or plaster), by pouring a filler material into a waste or rubber mould. The mould is rotated to distribute the filler material, and any excess is pored off. The technique is primarily used to create hollow intermediate copies (waste moulded patterns, or reproduction waxes).
SURMOULAGE: The practice of copying an sculpture by ‘lifting’ a reproduction mould from an existing cast. Often associated with lost pattern casting, or unauthorised copying of sculptures.
TEMPLATE: May be used as an alternative name for a master pattern, but usually refers to a marking out or positioning reference on paper or board for the accurate location of items such as holes, fixings and cut profiles etc.
WARNING LAYER: A colour coded surface indicating the proximity of a hidden object, usually a feature of waste moulds.
WASTEMOULD: A temporary mould, usually made of plaster, and used for forming a hard copy (usually in plaster) of a soft clay model.
REPRODUCTION MOULDING >
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