Pattern making and foundry practice; a plain statement of the methods of wood pattern making, as practiced in modern pattern shops, with complete instructions for sweep work and notes on foundry practice, together with numerous drawings taken from actual patterns .. . T^a7fC f oj tvrrnTto co-re hote for Tiq 30 discs glue the band h in sections, and to one discthe core print c. Next attach the prepared discsto the lathe and turn up, as shown in cross-sec-tion, Fig. 36. Turn up two core prints, d d,and dowel the two halves together, making thefinished pattern. AND FOUNDRY PRACTICE 71 Three core
Pattern making and foundry practice; a plain statement of the methods of wood pattern making, as practiced in modern pattern shops, with complete instructions for sweep work and notes on foundry practice, together with numerous drawings taken from actual patterns .. . T^a7fC f oj tvrrnTto co-re hote for Tiq 30 discs glue the band h in sections, and to one discthe core print c. Next attach the prepared discsto the lathe and turn up, as shown in cross-sec-tion, Fig. 36. Turn up two core prints, d d,and dowel the two halves together, making thefinished pattern. AND FOUNDRY PRACTICE 71 Three core boxes are required for this pattern:a plain half core for the center hole through thewheel, which has already been explained; a corebox representing all the cavity between the spokesof the wheel, Fig. 38, represented by the six. Qyte lidlf of cott lox for Tig 30 cores marked h 6, Fig. 35, B, and a circularcore box turned into the face of a plank (seeFig. 39, a and fe), which will mould half of thecore d shown in Fig. 35, B. A pattern for this wheel can be made withoutcoring out the flanges, by contriving the pattern 72 PATTERN MAKING to part near one side or at any place which willpermit the successful withdrawal of the half pat-tern. For a wheel cast after this pattern a three-part flask or a flask made of three boxes with aparting made between each box is employed.(See a a, Fig. 37.) It is possible to cast this
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicagofjdrakeco
