. Foundry practice; a treatise on molding and casting in their various details. Fig. 9. against loose sand being washed into the mold. Themold may now be dusted with plumbago and slicked, atwhich time the flask is ready to close. The flask shouldbe clamped to provide against the cope being lifted by themetal and the metal flowing out at the joint when the moldis poured. In clamping a flask it must not be moved or 8 FOUNDRY PRACTICE jarred, as the sand hanging at the top is liable to should the cope and drag be drawn together with agreat pressure, as the flask is liable to give, causin
. Foundry practice; a treatise on molding and casting in their various details. Fig. 9. against loose sand being washed into the mold. Themold may now be dusted with plumbago and slicked, atwhich time the flask is ready to close. The flask shouldbe clamped to provide against the cope being lifted by themetal and the metal flowing out at the joint when the moldis poured. In clamping a flask it must not be moved or 8 FOUNDRY PRACTICE jarred, as the sand hanging at the top is liable to should the cope and drag be drawn together with agreat pressure, as the flask is liable to give, causing thesand to crush the mold at the joint. The best methodof putting on the clamps is to have them stand nearly ver-tical and resting on a wedge at the top. The clamp maybe tightened with a clamping iron by catching the pointunder the clamp and on the wedge, then moving the upperend toward the clamp, as indicated by the arrow in Fig mold is now ready to cast. The process of making a mold with a split, or dividedpattern is shown by the small pulley in Fig. 10. The. — <•—• . Fig. 10. half of the pattern without the dowel-pins is placed onthe turn-over board and the drag placed on it as in theprevious case. The facing sand is put on until the armsare covered, then heap sand is riddled through a No. 4riddle until the centre is filled to the top of the rim. Sincethe hub is deeper than the rim, there is liability of thesand crushing out when the mold is poured, as the hubfills to the height of the arms before the rim receives any GREEN SAND MOLDING 9 iron. To prevent the sand from breaking and to hold ittogether more firmly, wooden soldiers are put into thesand between the rim and the hub. The soldiers aremade of any small pieces of wood, only large enough tobe stiff and of a length to reach beyond the pattern aboutthe same distance as it is inserted into the pattern. Theyare wet with clay wash, or flour paste, to hold the sandto the soldier. They are placed to a dept
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