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CNC sand casting is a two-step process. First, a mold is created using sand, which is typically mixed with a binding agent to ensure its stability. The mold is shaped in accordance with the design specifications of the desired part, often using CNC machines to ensure precision. Once the mold is prepared, molten metal is poured into it, allowing it to solidify and take the shape of the mold. After cooling, the mold is broken away to reveal the cast part.