By C. Ammen

Describes the sand foundry, the features of molding sand, the categories of mildew and development making gear, and a few of the sand casting techniques for forming metals.

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Set Gate Pattern If a pattern is made for a gate but not attached to a pattern but only placed against it while making the mold, this pattern is called a set gate pattern. SPLIT PATTERN This is a pattern that is made in two halves split along the parting line. The two halves are held in register by pins called pattern dowels. The pattern is split to facilitate molding. See Fig. 5-7. Fig. 5-6. Gated pattern. The dowels hold the two halves of the pattern together in close accurate register, but at the same time are free enough that the two halves can be separated easily for molding.

When the pattern is removed the resulting cavity is the exact shape of the object to be cast. The pattern must be designed to be easily removed without damage to the mold. It must be accurately dimensioned and durable enoughfor the use intended. Either one time use or production runs. PATTERN MAKING Each different item we wish to cast presents unique problems and requirements. In a large foundry there is a close relationship between the pattern maker and the molder. Each is aware of the capabilities and limitations of his own field.

The reason for this is that when the cope is rammed this lay out will show on the cope and locate where to cut the cope runner over to the sprue. See Fig. 7-14. Step 14 Apply dry parting to drag face. Step 15 Place cope on drag. Now repeat steps 4,5,6,7,8, and 9 to the cope half thereby completing steps 16, 17, 18, 19, 20 and 21 respectively. Steps 10, 11, 12, 13, and 14 apply to drag flask only. Step 22 Fig. 7-13. The rollover. 108 Cutting sprue. The sprue is the opening down channel in the cope sand which directs the poured metal into the runner thence into the gates which lead into the mold cavity.

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