A bowl can be a very simple form to design, but a very difficult endeavor to manufacture given the circumstances of different manufacturing techniques.
To do so, a small backyard forge, fired with propane was built. powered weed burner. As Resources, I collected scrap aluminum, zinc and copper out of the metal trash of the workshop. First I purified the scrap metal and cast little ingots, then models for casting were prepared. To make sure the casting process works trouble-free, there are many things to be taken care of. High temperatures are necessary for the liquefaction of metal. These can be generated by various methods. By electrical short circuit, as it is known from welding technology. Through electrical resistance in a coil. Or by combustion heat from gas or other fossil fuels. In the project, gas was the most affordable and cleanest resource, so the decision was made to use a gas-fired furnace. Initial experiments with charcoal showed that ash tends to fall into the Crucible. Lithium wool is poured into the furnace body to provide the necessary insulation. On the side of the furnace is an opening which provides space for the weed burner. Commercial propane gas provides the necessary heat of about 700°C. In order to remove the Crucible from the oven, special tools are needed, which are individually made for this purpose from steel.
Resulting from a form study, several bowls are created as models for the Cast. The PLA models are treated with primer and sandpaper to ensure a smooth surface when the mold is created. The two wooden cast forms are filled with oilsand and the model is inserted. By pressing down the sand, the model is embedded with the material. Inserting openings for the liquid metal and air vents, to prevent air enclosure in the cast.
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