Casting Metal Parts by H. Hoffman

By H. Hoffman

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Extra resources for Casting Metal Parts

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Once all the wax is úlost,ý the oven is partiality opened and the molds are allowed to cool to an above room temperature so that they may be handled with gloves. They are then removed from the kiln and brought to the pouring room near the melting furnace. Here they are placed upright that is, with the interior of the furnace contains a crucible with a pouring spout. It is used repeatedly for the same metal till replacement is necessary. In pouring a large piece, several melting furnaces can be used to make the required amount of metal, which is all poured into one crucible.

When these are quite dry, carefully rub them smooth with a pumice stone. The lower half of the mold is now complete. Its surface and the four holes are brushed with graphite or wiped with Vaseline to separate them from the plaster of the upper half. For the latter, we use much thinner plaster that should be poured on gently from the side and allowed to cover the grip slowly and gradually. Be careful to prevent the smallest air bubble from forming in the plaster. Once the grip is covered with a thin layer of plaster, stop pouring for a moment and then fill the frame to the top.

It is mounted on a piece of glass that has first been rubbed with liquid soap or Vaseline; it is then filled slightly less than half-full with a thick paste of plaster of Paris. To make the plaster harder, add a pinch of alum or some water glass. Use cold water for mixing, warm plaster hardens too quickly. After the paste has been thoroughly smoothed with a spatula, wait two minutes until the plaster has started to dry. Press the grip, sideways on, halfway into the plaster, having previously coated it thinly with Vaseline or salad oil.

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