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https://www.gemsociety.org/article/lost-wax-casting/
A centrifugal casting machine uses the weight of the metal and centrifugal force (even if only an apparent force) to fill the mold. A vacuum casting machine uses a vacuum to suck the molten metal into the mold. A force is needed to overcome the surface tension of the molten metal. Otherwise, the metal would form into a blob and just sit there.
https://jewelrydesigns.com/jewelry/jewelry-making/jewelry-casting/
Centrifugal jewelry casting uses the force of a centrifuge to create the inertia necessary to throw gold into the hollow cavity left behind. After burn out, the flask is placed in a cradle on a swing arm in direct alignment with a crucible in which gold or platinum will be melted.
https://www.aajewelry.com/centrifugal-casting-machine.html
Heavy duty spring in base spins the arm so that molten metal in the crucible is forced into the flask. Takes flasks up to 5" long and 31/2" in diameter.
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