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Rapid Prototyping & Manufacturing TechnologiesTwo-pieces mould approachFirstly, master pattern is prepared and laid horizontally inside a mould box withthe parting line built up by hand with model clay. Prepared silicone rubber ispoured inside the mould box to form one half of the mould. After solidification,clay is removed, the other half of the mould is produced by repeating the abovesteps with the master pattern turned upside down. Figure 4.2 shows the differentparting line surface of one-piece mould and two-pieces mould.Fig. 4.2 Left; one-piece mould Right; two-pieces mouldTwo-pieces mould is typically required when the parting line is difficult to bedetermined. Two-pieces mould approach requires less skill compared with onepiecemould. However, it requires double time to make the mould and thedimension accuracy of part is poor than one piece mould.Page 26IC Professional Training