By John Bolan
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Extra info for Casting and Moulding. Foundry Techniques for Schools
7). Repeat the moulding process described in Chapter 3, items 1 to 8. 2 Invert the box, and place the other half of the pattern on top of the first. The dowels will ensure that it is accurately located (Fig. 8). Fig. 7 Place half the finished pattern inside a moulding box 3 Carefully position the downgate and riser pegs (Fig. 8). 4 Repeat the moulding procedure shown in Chapter 3, items 11 to 22. The finished casting is shown in Fig. 1. Method of turning split patterns 1 Dowel t w o pieces of timber, larger than the required size, using the technique described earlier (items 1 to 7).
6 After cooling, the finishing process can begin. Sometimes it is desirable to retain the runner bar either temporarily, in which case it could be used to hold the work in a vice, or alternatively it could become a part of the finished project (Fig. 7). Fig. 4 pattern Press the sand around the Fig. 5 Exposed surface of runner 36 y Fig. 6 Finished casting Fig. 7 Abstract design which incorporates the runner as part of the project In times of financial stringency, it would be difficult to find a cheaper craft activity than making castings from polystyrene patterns.
General points about t h e use of plaster The plaster must be thoroughly dry before the metal is poured, because dampness will cause gases to be evolved which can leave holes in the castings. It is suggested that the plaster be dried in an oven since better aluminium castings will be produced if the plaster is warm when the metal is being poured. If a combination of plaster and sand is used, as described in this chapter, it is important that there should be no delay between the drying of the plaster and the casting of the metal, because the plaster could absorb moisture from the sand and from the atmosphere.
Casting and Moulding. Foundry Techniques for Schools by John Bolan