To design and manufacture a wooden pattern for a given casting

Why is a rough sketch made before starting the pattern-making process? (LO2)
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What is the significance of marking the circle on the wooden piece before cutting? (LO2)
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Why are cylindrical pieces of different diameters and heights cut separately? (LO2)
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Why is adhesive used to join the wooden pieces together? (LO2)
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Why is the wooden pattern used in the casting process? (LO1)
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