Canadian foundryman (1921) . he most convenient placefor the making of the false cores, ordrawbacks as they are commonly instance, if we are molding thetrunk of the body of a man, it may hap-pen that the disposition of the draperiesor of the arms will make it more ad- of the model, and, when the work allowsit, to start from the surface of the flaskaround and up the pattern, like a brick-layer or mason building an arch over anirregular shaped vault. The False Cores or Drawbacks This covering up of the pattern by agreater or less number of false cores issometimes very difficult when th
Canadian foundryman (1921) . he most convenient placefor the making of the false cores, ordrawbacks as they are commonly instance, if we are molding thetrunk of the body of a man, it may hap-pen that the disposition of the draperiesor of the arms will make it more ad- of the model, and, when the work allowsit, to start from the surface of the flaskaround and up the pattern, like a brick-layer or mason building an arch over anirregular shaped vault. The False Cores or Drawbacks This covering up of the pattern by agreater or less number of false cores issometimes very difficult when the re-cesses are deep and do not deliver. Forinstance, let us suppose that the fold ofa drapery resembles about one-half ofthe figure 8. The sand rammed into itcannot be removed from the contractedpart. If the curve enlarges sufficientlyabove or below, it may be possible toslide the false core out. The best planis to lay a piece of paper against onehalf of the curve, and ram a false coreagainst it, thin enough to pass through. CORE BEING PUT IN PLACE. FALSE CORES OR DRAW BACKS WILL BE PLACEDAROUND THIS TO FORM THE OUTSIDE. AFTER WHICH THE COPE IS CLOSED UPON THEM. vantageous to dispose the model slant-ingly or sideways instead of on its supporting body of sand need notterminate in a plane surface, flush withthe top of the flask; on the contrary, itis raised or lowered to follow the con-figuration of the model in the directionmost suitable to the work. The onlycondition required of this unequal sur-face is, that there should be no undercutportions to prevent the smooth union orseparation of two joints When we have finished the operationof burying the model, or making thebed, to use the more common expres-sion, the sand is then all smoothed,pressed, and plenty of parting rubbedinto it. The Real Molding Now begins the real work. The ruleis to begin by the hollows on the surface the opening. After making the joint ofthe core sufficiently hard to ram anotheragainst it, place
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
