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However, a carefully made mold can give some 20 castings before the edges begin to crumble, rendering the mold unusable. 57 CASTING METAL PARTS SAND CASTING This is the earliest, and still the most commonly used, of all casting processes. It can be used with brass, aluminum, bronze, copper, and magnesium. The pattern cost is low, wood and metal patterns are used. The piece cost is fairly low, and pieces of almost any size can be cast. Although, it is adapted primarily too small or medium quantity production sand casting.

In this case, it might be advisable to reverse the position of the flask after the first hour (during which it has been in the kiln with the sprue opening down), set the flask on a Nichrome wire trivet, and, an hour later, reverse It again. Metal tongs should be used to handle the hot flask, and asbestos gloves worn. The time for burnout varies with the size of the flask and the amount of pattern wax in the model. Small flasks with delicate models may take only two hours, while larger flasks require from three to six hours and sometimes more.

Remove both the air pressure and the lever arm pressure from the flask. Permit the flask to cool for about five to ten minutes. At this point the casting operation has been completed. Plunge the flask into a bucket of water at room temperature. As the water contacts the hot investment, steam will be generated and the investment will disintegrate into the water. Permit the flask to remain submerged until completely cooled. The casting should have dropped from the flask, but if it hasn't by the time the flask is removed from the water, carefully force the casting from the investment.

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