By H. Hoffman
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Extra resources for Casting Metal Parts
NOTE - Do not drop or shock the investment material. This would cause visible cracks in the finished casting and perhaps destroy it. Burnout should not begin too early, for the too rapid evaporation of moisture at elevated temperatures might cause the investment material to expand too fast, crack, or be destroyed completely. Cracks in the investment appear in the casting as úfinsý or as finlike metal projections on the surface. These can be removed, but they might appear in an unexpected location and blemish a design or surface, Splintering of the inner mold surface that is called úspalling,ý is another danger in too rapid a burnout at the beginning stages.
Remove the fulcrum pin and select the correct hole so that the lever arm of the casting machine will be as nearly parallel to the base as possible. Replace the pin. Press the lever arm down so that the pressure plate firmly contacts the flask. Release the pressure and repeat the pressure application to the flask a number of times. The pressure plate is attached to a swivel and may not completely seat with the first application of 44 CASTING METAL PARTS pressure. The casting machine is now adjusted to receive the first flask.
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.