Canadian foundryman (1921) . DING CROOKED PIPE WITHGREEN SAND CORE In molding a quarter turn pipe coup-ling, commonly known as an elbow, onemethod is to have a solid pattern anda core box. The core is made anddried. After making the mold the drycore is put in place with chaplets onall sides to keep it in place. Anothermethod is to only dry the bottom halfof the core and make the top of greenmolding sand. By standing a piece ofinch stock core of proper length in thecore box when making the green half,it will bear on the dry half and up to thetop of the green half and will hold thetop chaplet an
Canadian foundryman (1921) . DING CROOKED PIPE WITHGREEN SAND CORE In molding a quarter turn pipe coup-ling, commonly known as an elbow, onemethod is to have a solid pattern anda core box. The core is made anddried. After making the mold the drycore is put in place with chaplets onall sides to keep it in place. Anothermethod is to only dry the bottom halfof the core and make the top of greenmolding sand. By standing a piece ofinch stock core of proper length in thecore box when making the green half,it will bear on the dry half and up to thetop of the green half and will hold thetop chaplet and not allow the chapletto crush the green sand. Another way,but a doubtful one, would be to have allthe core green sand and place it in themold in a similar manner to setting thedry core, but the way which I purposedescribing is to make it from a split,hollow pattern, making the core andoutside of the mold in one operationand not having any separate core madein a core box. This can be done inmore ways than one. One way would. SIDE VIEW OF CYLINDER MOLD WITH ONE END RAISED. AND POURED FROM LOWER END. ApiiJ, 1921 CANADIAN FOUNDRYMAN 25 be to have both halves of the flask bar-rel and use each one in its turn as acope. Another, and the one which Iwill describe, is to make it in an ordin-ary mold and only roll it once. Thearbor will be shaped like the sketch,Fig. 1. If the reader will follow close-ly it will be possible to understand theprocess without any further smooth board is used to begin arbor is placed as shown and halfthe pattern is placed upon it. A littlesand is tucked in at each end to allowa parting to be made from the board tothe line of the pattern. No attempt ismade to tuck sand in with a view tomaking the core. The parting is madeto separate what will be the core fromthe main body of the mold. Aftermaking these partings the mold is pro-ceeded with by the usual process of ram-ming the drag and rolling it rolling over, sand is sifted on
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
