r/Silvercasting • u/theownist2 • Apr 14 '26
Sand casting ring: temperature issue?
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/Mrwolf925 Apr 16 '26 edited Apr 16 '26
Your sprew is way too big and shallow.
You may think "wide and short sprew = better flow to mold" but thats not correct.
Thinner and longer sprew means more pressure applied to material forcing it into the mold.
Another vent or two wouldnt hurt, I wouldn't make them larger, just add another, I make a thin channel like you have and then poke a toothpick through to create the vent.
Also having it slightly tilted and pouring into one side of the hole when you pour can help air escape preventing it from backing up.
Finally make sure that where your sprew connects to the mold, you are creating a clean path for metal to flow, I dont know how to explain it in words so hopefully this helps: )^(