Vintage work crew photos

[Unkle Fuzzy]

No patterns used. Like ship's propellers the mould is built out of bricks of moulding sand and then hand shaped by carving away anything that doesn't look like a turbine housing. For really big low count or one of a kind castings this is basically the only way to do it. The pour gets really interesting. Multiple ladles of metal poured one behind the other before the previous pour cools to much for a good bond. For real high strength sand moulds clay binders may be too weak and Portland cement or sodium silicate as a binder, with the result that the mould has to be jackhammered away from the casting.