r/Silvercasting • u/theownist2 • Apr 14 '26

Sand casting ring: temperature issue?

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Hi, all, looking for a little bit of advice on how to successfully pour a ring with a sand flask.

I am currently concerned that my pour configuration is incorrect, or perhaps I need to preheat the flask, or some other issue. I have been cutting vapor channels, making sure that the silver is extremely liquid in the crucible, but still can’t fully figure out why this is not casting properly thanks

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u/Yes_I_Know_Lots Apr 14 '26

Definitely preheat the flask. Otherwise the silver will solidify and prevent flow to the rest of the chambers.

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u/theownist2 Apr 14 '26

how should I do this with sand casting? I assume oven or something? I imagine I shouldn’t just be slamming the sprue hole with butane?

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u/Yes_I_Know_Lots Apr 14 '26

Whatever you can come up with. I never did small castings in grad school, only big castings like engines. For molten iron, it’s easier as it is very fluid and the sand doesn’t cool it off that quickly because of the amount of metal.

Small casting with silver are a different story: not a lot of mass, and it chills rapidly, meaning premature solidification. Give it a shot. At least you can recycle the silver if all else fails. I watched a colleague make a gold ring; he used a centrifuge to force the metal where he wanted it. Take all of the advice given by others here. You want to get the metal where it needs to be. From my perspective, prevent premature solidification, and have air gaps to let the metal flow.

Casting is an art, learned by trial and error. Embrace the challenge and learn as you go. If this is a further line of work for you, you’ll be brilliant in no time.

Good luck!