NIce work! That is a tempting rabbit hole. So many neat opportunities,
Acrylic has a pretty large coefficient of thermal expansion (meaning it grows a fair amount when it heats up), I wonder if it would noticeably affect larger pours. I think staying thin and small like a coin got you out of a lot of these problems.
I cast pewter and would like to offer a suggestion. It looks like you have your mold on a plate while pouring the metal. After my first mold failure (decades ago), I now put my mold in a meatloaf / bread pan (metal, not glass) if it will fit, or something larger with high sides if necessary.
I only had a failure with my mold, my friend lost quite a few layers of flesh to metal escaping the mold.
This is such a great idea and I would never have thought of it since acrylic melts before pewter, but silicone…
ah, the rabbit holes I find here …
THAT is the voice of experience
Great job. Thanks for sharing and inspiring.
I haven’t cast metal before, but I have cast many other things (ie, chocolate and resin). If the back of your pour is flat, what is the benefit of pouring from the top in a channel rather than just leaving the back open and pouring it flat?
We tried that as well - it works ok, but the open side winds up with of a “pillowed” appearance instead of being flat. It’s a different effect, and looks fine if that’s what you are going for, but we were trying for something flatter.
Very cool! Exploration knows no bounds!
In my limited experience in casting with an open cavity, you can’t get a really smooth, flat backing. It may come out pitted and if you slightly over-fill, it will be domed. (Or outright overflow the mold.) It’s easy to sand the back and fix it, but it’s obviously more time-consuming.
Hey there… I was at burning man and a camp did this as a craft and it was really cool. They gave me a couple of forms so I could learn from it… these sources a details are excellent, thanks
Seems like a Make did a version of this recently, nice write up.
That’s a great article, thanks!