I don't fully understand the process, but this paper has an explanation and diag...

		akamaka on Sept 11, 2016 \| parent \| context \| favorite \| on: Rolls-Royce’s single-crystal turbine blade casting... I don't fully understand the process, but this paper has an explanation and diagrams: http://www.journalamme.org/papers_vol32_1/32110.pdf