I've already done extensive googling, but cannot find images or a method to support my hypothesis of how the mould fits together.
What makes you think they are cast?
Thanks sungod. Yes that is the basic method for casting solid objects.
But if you are casting hollow items, you have cores that are inserted into the moulds and then removed. I am interested in how the cores for the bb shells are removed, and i assume to make the interconnecting hollow passages, that you have a mould of the internal shape of the bb shell, that is then dunked in the wax, and then that is dunked in ceramic slurry, blah blah.
Im just looking for info on the core..? Any ideas?