. Foundry practice; a treatise on molding and casting in their various details. n Fig. 26. To ensure a firm, clean casting, it is advisable in thiscase to run some metal through the mold after it is filled. 26 FOUNDRY PRACTICE The mold is poured from the bottom, thus providing askim gate and allowing the metal to rise in the mold with-out flowing across the overhanging portion of the cheek. To form the mold, the pattern is placed on the follow-board with all the parts in place. Facing sand is put intothe pockets to a depth of about 2 in. Long rods areplaced in the pockets to securely anchor th
. Foundry practice; a treatise on molding and casting in their various details. n Fig. 26. To ensure a firm, clean casting, it is advisable in thiscase to run some metal through the mold after it is filled. 26 FOUNDRY PRACTICE The mold is poured from the bottom, thus providing askim gate and allowing the metal to rise in the mold with-out flowing across the overhanging portion of the cheek. To form the mold, the pattern is placed on the follow-board with all the parts in place. Facing sand is put intothe pockets to a depth of about 2 in. Long rods areplaced in the pockets to securely anchor them in the in about 2 in. more of facing and ram lightly with arod or stick, using care to avoid making the sand too remainder of the pocket is filled and rammed. Thepins may be removed from the bosses. The pocketsshould now be thoroughly vented, using a needle wiresmaller than TV in. in diameter. The cheek may be placed on the follow-board aboutthe pattern. The gate stick is placed in its position out-side of the pattern. The cheek is now rammed and thepar
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