By C. Ammen
Describes the sand foundry, the features of molding sand, the categories of mildew and trend making gear, and a few of the sand casting techniques for forming metals.
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Extra resources for complete book of sand casting
And this clean surface is going to be the face the metal lies against during casting, insurance that you will have a good inner mold face. See Fig. 7-7. Step 5 Now we fill the drag flask heapiig full of molding sand. Now don't do this like filling a wheelbarrow. The shovel full of molding sand is put into the flask by letting it gently slide from the edge in such a manner as to not disturb the pattern position. In other words, don't dump it but place it in where you want it heaping full. Step 6 Peen the drag.
COMPLETED Fig. 6-17. Ram up core. CORE PLATES Core plates as you have no doubt guessed by now are flat plates used to bake the ores on in the core oven. They can be made of cast aluminum which has been normalized and machined to a true flat surface. , these can be had in a range of sizes and thicknesses from any foundry supply house. VENT WAX These are tapers of various diameters made of a wax and rosin combination. The vent wax is rammed up in the proper position in a core, and when the core is baked, the wax melts leaving a vent channel.
Thus a 3/16 inch shrink rule 12 inches long will be actually 12 3/16 inches long, but for all appearances will look like a standard rule. But, when layed out against a standard ruler it win project 3/16 inch past the standard ruler. These rulers come in a large variety of shrinks. Generally the shrinkage allowance for brass is 3/16 inch per foot, % inch per foot for cast iron, % inch per foot for aluminum and % inch for steel. This would hold true for most small to medium work, for larger work the shrinkage allowance is less, in some cases 50 percent less.