Mechanical Contracting & Plumbing January-December 1909 . ttern — TheThird of a Series of Articles by Dillon Underbill, in TheFoundry. After the lead pattern has been fin-ished we follow the tub pattern, in itsregular course of manufacture, into thehand tub foundry The lead pattern is shown on theform and follow-board in Fig. 3, thecheek and cope are in place and thesand in these sections of the mold hasbeen rammed. In this view a 5-foot tubis shown in section and the wood barsare also located and properly this class of work it has beenfound that the bars hold the sand best Since th
Mechanical Contracting & Plumbing January-December 1909 . ttern — TheThird of a Series of Articles by Dillon Underbill, in TheFoundry. After the lead pattern has been fin-ished we follow the tub pattern, in itsregular course of manufacture, into thehand tub foundry The lead pattern is shown on theform and follow-board in Fig. 3, thecheek and cope are in place and thesand in these sections of the mold hasbeen rammed. In this view a 5-foot tubis shown in section and the wood barsare also located and properly this class of work it has beenfound that the bars hold the sand best Since there are only two or threecastings made from the lead patternat the most, the sand can be rammedas shown in Fig. 3, and after the copeand cheek have been rolled over, thecheek and follow-board rammed, thesand can be cut away by the molderdown to the parting necessary on therim of the tub. In other words, thesurface exposed will be dished alla,round the pattern. However, if de-sired, a beveled strip of wood may beset in entirely around the pattern so as. the regular cast iron pattern is the cast iron pattern is rammed,only a follow-board is required,, and theform is made of strips of wood tackedtogether to merely prevent the patternfrom shifting. On the other hand, theform shown in Fig. 3 supports all partsof the lead pattern while it is beingrammed. The parting line, when thecast iron pattern is used is made par-allel with the follow-board by cuttingdown into the follow-board, or is builtup so as to make the parting line par-allel with the follow-board itself. Finishing the Mold. After the flask has been rammed thecope and cheek are lifted off and thepattern is removed by a crane, as it istoo heavy to lift by hand and must beremoved from the sand very the hand tub foundry a jib craneworks very well, and may be used toserve a number of molders, the tubsbeing arranged around the crane as acentre. A sectional view of the moldready to pour is shown in Fig. 5
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