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Types of patterns : These depends upon many factors like the bulk of casting, type of moulding processes, number of castings required and the anticipated difficulty of moulding, on account of the typical shape or design of casting.
The following kinds of patterns are generally used :
1. Solid or single piece pattern
2. Two-piece or split pattern
3. Multi-piece pattern
4. Match plate pattern
5. Gated pattern
6. Skeleton pattern
7. Sweep pattern
8. Pattern with loose piece
9. Cope and drag pattern
10. Follow board pattern
11. Segmental pattern
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A riser or a feeder head is a passage of sand made in the cope to permit the molten metal to rise above the highest point in the casting after the mould cavity is filled up. Risers
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