Why gravity die-casting?
For low volume, very large or very complicated castings, sand casting is the usual route, where a pattern is (relatively) cheap, but the casting is expensive. For very high volumes pressure die-casting is the answer, as high tooling costs are offset by much lower unit costs. Gravity die-casting falls in the middle ground where tooling is not prohibitively expensive, but savings on casting costs can bring the break-even point down to as low as 200 units.
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