Modern Mechanical Engineering Vol-I

134

FOUNDRY WORK

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Fig. 36.—Cored Mould for Bevel Wheel

means of lifting it into the stove and mould (figs. 30, 31, 35, and 36).
When practicable, the core is rammed in the same position that it has

Fig. 37.—Core Box, with Vent Rods

Fig. 39.—Shows Vent Rods in Core

Fig. 38.—Core with Stiffening Rods

Fig. 40.—Vent Strings in Core

to occupy in the mould, turning it over being generally avoided. Eyes
therefore come in the upper part of the core. The outlines of the grids
must follow approximately those of the core, so that a suitable grid has to