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By H. Hoffman
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Additional info for Casting Metal Parts
The point at which the sprue attaches to the bottom plate will normally detach from the plate and be kept in the Investment. When the investment has set for at least one-half hour, it should be hard to the touch. With a sheet metal reamer about 1/8 inch in diameter smaller than the inside diameter of the flask. Ream a cavity Into the Investment. Use the wax sprue wire to guide the center the reamer. Clean off the buildup of investment on the reamer every so often. The reamed cavity will hold 41 CASTING METAL PARTS the casting metal after burnout.
The pieces should be centered about the height of the flask. The exposed areas, both top and bottom, with no asbestos covering, will act as locks to keep the investment within the flask when the flask is removed from the burnout oven and transported to the casting machine. Sufficient investment is applied to make a solid cover over the entire model and spruces, and about twenty minutes is allowed for drying. The model is placed into the flask with the sprue former in contact with a sheet of plate glass.
Metal should not be poured too hot as an undesirable surface will result, and neither to cold or it will not run properly and if the mold, resulting in an imperfect casting which is then a total loss. There is a leeway of about 1 50ÿ Fin which a pouring can be successfully completed. The metal is allowed to cool sufficiently for the mold to be handled. The one-piece plaster mold can be used only once. In the shaking out operation, the casting is removed and the mold is destroyed with a hammer and tools.