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Extra info for Casting and Moulding. Foundry Techniques for Schools
Equipment core box (Fig. 3) casting plaster moulding sand aluminium furnace moulding boxes parting powder moulding tools safety wear Fig. 3 core Core box, core, and shaped 28 Method 1 Make a wooden core box (Fig. 3) which is large enough to produce the desired shape and size of casting. 2 From the box, produce a core (Fig. 3) that can be made either in sand or in casting plaster (which can be poured in a similar manner to plaster of Paris). If plaster is used to make the cores, it must be thoroughly dried and free from moisture before casting.
Further suggestions From the creative design aspect of craftwork, the number of the projects which can be made using this method of casting is limited only by the school's resources and the pupil's imagination. Several examples are shown on the following pages which could, if required, be used as a base for further development. The method of producing flat plate castings is very similar to items 1 to 6, except that it is sometimes advisable to cast the plate on an angle (Fig. 8). runner vent polystyrene pattern Fig.
8). 13 Add the top-part box (cope) and add a large downgate peg (Fig. 8). 14 Sprinkle parting powder over the mould joint. 15 Add facing sand, then backing sand, and ram up the top-part box (see Chapter 3, moulding procedure, items 11 to 1 5). 16 Remove the completed top-part box and stand on its edge. Fig. 7 Moulding box in position 17 Take out the downgate peg. 18 Remove the flat pattern from the mould (Fig. 9). 19 Have the mould checked, replace the top-part box, and take the finished mould to the casting area.