By H. Hoffman
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Additional info for Casting Metal Parts
Though these can be removed, sometimes, they normally detract from the detail of the piece and make finishing difficult. ý These are essentially detergents that lower the surface tension of the mixture and allow air to escape more easily. Vibrators have also been used to úshakeý the bubbles loose. But, by far, the most satisfactory method of eliminating bubbles is by mixing the Investment in a vacuum. The problem is to obtain a vacuum in a suitable container while still being able to stir the mixture inside.
The whole assembly the pouring basin, spruces, runners, vents, and risers are called the gate assembly. MAKING THE MOLD There are several ways to make a mold. You can start by spreading a thick layer (four to six inches) of plaster on a board large enough to accommodate the model and a wall of plaster about four inches thick that will be built up around it. The luto plaster for this wall is made by mixing two parts of new plaster of Paris with one part of used plaster ground up coarsely from old molds.
Place the water into the mixing bowl. With a spatula, sprinkle the dry investment on the water. Sprinkle on only small amounts of the investment at a time. At first, the water will absorb the investment and it will sink to the bottom. Eventually, the dry investment will begin to build on top of the water. If the pattern is intricate and detailed, a thin mixture of investment will be needed. If the pattern is bulky, a thicker Investment will be required. Although a thinner Investment will more readily conform to an intricate pattern, it is inherently weaker.