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Different types of patterns: the types of pattern used depends upon the design of casting, complexity of shape, the number of casting required moulding process, surface finish and accuracy. The common types of patterns are: 1) Single piece pattern 2) Split piece pattern 3) Loose piece pattern 4) Gated pattern 5) Match pattern 6) Sweep pattern 7) Cope and drag pattern 8) Skeleton pattern 9) Shell pattern 10) Follow board pattern Figure 1: Single piece, Split, Match-plate, Cope and Drag Pattern Single piece pattern: This is the simplest type of pattern, exactly like the desired casting. For making a mould, the pattern is accommodated either in cope or drag. Used for producing a few large castings, for example, stuffing box of steam engine. Split pattern: These patterns are split along the parting plane (which may be flat or irregular surface) to facilitate the extraction of the patternout of the mould before the pouring operation.
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