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complete book of sand casting by C. Ammen

By C. Ammen

Describes the sand foundry, the features of molding sand, the categories of mildew and development making gear, and some of the sand casting approaches for forming metals.

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Extra info for complete book of sand casting

Example text

Shrinkage Now back to our simple disc pattern. If we wish the casting to come out as cast to the dimensions we show of 12 inches in diameter 1inch thick, we must make the pattern larger and thicker than 12 inches x 1inch to compensate for the amount that the metal will shrink when going from a liquid to a solid. This is called pattern shrinkage. This varies with each type of metal and the shape of the casting. The added dimensions are incorporated into the pattern by the pattern maker by using what is called shrink rulers.

Closing the flask. 114 Fg. 7-23. Bevel gear blank pattern. 115 A PART > Fig. 7-24. Gear pattern in drag mold. line.

Cnn l7;e-v Vbb 1 1 6 . 4-93 I-YY. The lifting or buoyant force on the cope is the product of the horizontal area of the cavity in the cope, the height of the head of metal above this area and the density of the metal. This lifting force on the cope has to be reckoned with. If the force is greater than the weight of the cope the cope will be lifted by this force when the mold is poured, and run out at the joint resulting in a lost casting plus a mess. r . ,. ,... -otme cow. ot tne coDe we muuDlv .

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