Do you love MATHS?
Casting includes a heaping amount of math & science. Converting imperial and metric weights, calculating volumes, gravities and densities, and knowing the physics behind different molten metals when poured. When liquid metal flows into the flask the temperature immediately starts cooling, so the design should include smooth paths upside down to not hinder the velocity of the flowing metal being poured before the metal starts cooling.
It sounds confusing but it's FUN!
Preparing these maths in advance makes for a successful casting.
Here's a pic of wax converting to metal: in order to calculate how much metal I need for a piece, I weigh the wax (in grams) and multiple the weight by the gravity of the metal I plan to use. The gravity of Ancient Bronze is 10.8g:
41g wax x 10.8 gravity = 442.8g Bronze needed.
I top it off to 500g to account for the negative space in the base of the sprue and voila!
Here's the gravity of more metals I use:
Aluminum - 2.7
Sterling Silver - 10.32
14k gold - 12.65
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