As the bronze cools, it shrinks. This cracks the shell a little, but we then take a hammer and pretty much whack the base of the sprue. Most of the shell breaks off during this part mostly because of the vibrations through the metal. The rest I chisel off.
1 comment:
thanks for the detailed description! sounds really cool. i can't wait to see the finished product! good luck with finals-
love kat, sarah and mom
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