By H. Hoffman
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Additional info for Casting Metal Parts
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 the metal is ready, the furnace is opened and the metal is poured at specific temperatures (1950ÿF for bronze) into the crucible that will contain all the metal needed for filling the mold completely. The mold must be filled in one continuous pouring. MEASURING THE METAL During the burnout operation for the wax, the metal for casting can be prepared for small castings.
Sprinkle the sand uniformly with water, and thoroughly mix with a shovel or trowel. Test for the proper moisture content as follows: Make a lump of sand by squeezing a handful together in the hand. Break the lump into parts with the fingers, and if the edges at the breaks are firm and sharp, the sand is ready for use. The pattern is checked to see that the draft is pointing upward so, when the flask is turned, the pattern may be removed without breaking the mold. The drag half of the flask is placed on the molding board with the pins pointing downward.
Regular venting for large castings is accomplished as follows: Use a wire 1/16 inches inch diameter, and punch holes in the sand directly above the pattern. A knitting needle also serves well for this purpose. Space the vent holes about 1 inch apart, and make them reach to within about þ inches of the pattern. The bottom board is then placed on the sand and rubbed firm to the bed. Next, the mold is turned over so the cope may be placed in position. Throw a thin layer of fine, loose sand over the level sand surface of the drag.