. Foundry practice; a treatise on molding and casting in their various details. y anchored by bearing on thesand or by chaplets to prevent its floating when the ironsurrounds it in pouring. Some of the principles involved in setting cores areillustrated in making the casting shown in Fig. 21. Thisis the casing for a theadstock whose body part is hollowand having the bearings cored for babbit. The pattern used is shown in Fig. 22. This is a one-part pattern having loose pieces for the projecting this case the loose pieces are held in place by a dove-tail. Usually loose pieces are pinne
. Foundry practice; a treatise on molding and casting in their various details. y anchored by bearing on thesand or by chaplets to prevent its floating when the ironsurrounds it in pouring. Some of the principles involved in setting cores areillustrated in making the casting shown in Fig. 21. Thisis the casing for a theadstock whose body part is hollowand having the bearings cored for babbit. The pattern used is shown in Fig. 22. This is a one-part pattern having loose pieces for the projecting this case the loose pieces are held in place by a dove-tail. Usually loose pieces are pinned onto the cases where loose pieces are pinned on, the sand isrammed around the loose piece, then the pin is drawn,leaving it free from the pattern when it is withdrawn fromthe mold. The drag and cope are rammed in the usual manner ofa common mold. When the pattern is drawn from thedrag, the loose pieces remain in position in the sand, asat A, Fig. 23. The mold should be patched and finishedbefore drawing the loose pieces. The edge of the large 22 FOUNDRY PRACTICE.
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