. American foundry practice . should be of a thicknessto crack open easily, and still have bearing enough to hold SPLITTING PULLEYS AND OTHER CASTINGS. 281 the Joints strong when bolted together to be turned andbored out. There are two styles of lugs, or ears, shown onthe rim for boltingthe halves round, separatelugs B^ By are madein a core box, andwhen ramming upthe pulley, set thedry sand lug coreagainst the pattern,and ram them opposite lug ismade with a pieceof pattern Avith coreprint on the bottom,to set in the long,flat core, as shownat D. This splittingcore D is some
. American foundry practice . should be of a thicknessto crack open easily, and still have bearing enough to hold SPLITTING PULLEYS AND OTHER CASTINGS. 281 the Joints strong when bolted together to be turned andbored out. There are two styles of lugs, or ears, shown onthe rim for boltingthe halves round, separatelugs B^ By are madein a core box, andwhen ramming upthe pulley, set thedry sand lug coreagainst the pattern,and ram them opposite lug ismade with a pieceof pattern Avith coreprint on the bottom,to set in the long,flat core, as shownat D. This splittingcore D is sometimesrun half-way intothe rim of the pul-ley, in tlie form ofa sharp V ; this will make the splitting of the rim latter form of lug is used for light and heavy sj^litting these pulleys the job is generally left to themacliinist, and I think the best plan is to split them openbefore boring or turning, as the chisel marks can then beall turned out, and a truer pulley made than by splittingafter 382 STRAIGHTENING CROOKED CASTINGS. STRAIGHTENING CROOKED CASTINGS. ** Which way will my Ccastiiig go ? is a question that isoften asked. To answer this question correctly eyery timewould be a very hard task. The moulder may be very wellversed in the cooling and contraction of castings, but some-times a complicated piece will come along that will puzzlehim. In some castings the sooner some of the parts arecooled the less liability there is of the casting being crooked,while again there are others that require to be cooled fromsome certain temperature. There are two reasons for castings warping. The first isill-proportioned thickness; the second, the allowing of someparts to cool before others. To these a third reason mightbe added, viz., the quality of the iron. Bad 2^1oportion is,perhaps, the chief cause for warped castings. The two sketches illustrate the straightening of a crookedcasting, and also how gates and runners often make castingscrooked. Casti
Size: 1349px × 1853px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublish, bookpublisheretcetc
