After Jeshua tried lost wax aluminum casting but with 3d printed PLA I was sceptical if this was within the possibilities of a DIY project.
The equipment he used looked like it was only feasable if you worked at a steel melting plant or something.
Now David Knaack posted some photos of James Harr and Brandon Norris of the Omaha Maker Group doing the same thing but a way more low-tec way. I'm quite impressed. (Photos below)
And yet another such casting. This time by David Knaack casting a RepRap filament drive gear from aluminum.
The process is:
- make a positive master model (here a 3d print)
- carefully cast plaster around it. Avoid trapped air.
- place in a furnace to get all remaining water out of the plaster and burn off the PLA.
- slowly pour molten aluminum
- wait for it to cool. Expect the aluminum to shrink
- first posting that started it all
- second such posting
- Omaha Maker Group
- third one.
- Wikipedia "lost wax casting"