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 .. . jF\y 9 been left light. In moulding patterns of the classshown in Figs. 9 and 10, the process is much thesame as has already been described. The lugsa a, Fig. 10, are made removable, andwhen removed the pattern. Fig. 9, is laid flat onthe follow board. The drag is then placed inposition and rammed up; then it is turned overand th
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 .. . jF\y 9 been left light. In moulding patterns of the classshown in Figs. 9 and 10, the process is much thesame as has already been described. The lugsa a, Fig. 10, are made removable, andwhen removed the pattern. Fig. 9, is laid flat onthe follow board. The drag is then placed inposition and rammed up; then it is turned overand the lugs a and a inserted, the cope se-cured in its proper position, the parting made AND FOUNDRY PRACTICE 35 and the cope rammed up, as heretofore flask is then separated and the wood pat-tern. Fig. 9, is removed and in its place the coreis laid J making the complete mould, as shownin Fig. 10. Small patterns are often gated together, aspreviously mentioned, or a flask is leveled off anda quantity of tliem stuck around here and there,. /// £{gcftoytCT? vtgw o£ mould for /yys a flf ^ ^howin^ paiicrn itt_ sang while in other cases the pattern will be almosttoo large to be put in a flask at all. In suchcases it is customary to dig a pit in the floor ofthe foundry to answer for the drag, and in thecase of large castings, such as flywheels, enginebeds, etc., the pattern itself is so heavy that itcan be handled only by the use of a power hoistor crane. PATTERN SHOP PRACTICE It is customary in pattern shops to furnish thepattern maker with a mechanical drawing or blueprint of the part to be made. This is very im-portant, in fact almost an indispensable part ofthe work, and yet often this drawing falls farshort as a reliable guide to the pattern maker;for wliile it may indicate clearly enough the styleof casting desired, it may contain no directionsor suggestions which will govern or assist thepattern maker in the construction of the the office drawing ma
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicagofjdrakeco
