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Investment casting
From WikiPedalia
Sheldon Brown's Bicycle Glossary · letter I-L
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Investment casting or "lost wax" casting permits casting of complicated shapes by using single-use plaster moulds that can be broken apart to free the cast part from the mould. This is an expensive process used mainly for high quality lugs and fork crowns.
This process is explained in detail at: https://juxtamorph.com/the-lost-wax-casting-process/
