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Rotational molding offers design advantages over other molding processes. With proper design, parts assembled from several pieces can be molded as one part, eliminating high fabrication costs. The process also has inherent design strengths, such as consistent wall thickness and strong outside corners that are virtually stress-free.
Keel moulding : Sharp-edged moulding resembling a cross-section of a ship's keel, common in the Early English and Decorated styles. [8] Lamb's tongue : Lambs Tongue is a moulding having a deep, symmetrical profile ending in a narrow edge. [9] Muntin: Narrow strip of wood or metal separating and holding panes of glass in a window. Ogee: see "Cyma"
Coping is only ever used for internal corners. External corners are always mitred. The main reason that scribed joints are used is that timber shrinks in width far more than it does in length. By using a scribed joint rather than an internal mitre joint, the effect of shrinkage is minimised. Also it is possible to arrange the scribed joints ...
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 exterior corner is a line of convex function (in these cases, fillets are typically referred to as rounds).
The flow of metal into the moulds can be controlled via three methods: By stopper rods that descend through the tundish, By slide gates at the top of the mould shrouds, If the metal is open-poured, then the metal flow into the moulds is controlled solely by the internal diameter of the metering nozzles. These nozzles are usually interchangeable.
Molding material: The material that is packed around the pattern and then the pattern is removed to leave the cavity where the casting material will be poured. Flask: The rigid wood or metal frame that holds the molding material. Cope: The top half of the pattern, flask, mold, or core. Drag: The bottom half of the pattern, flask, mold, or core.