If theblocks were properly placed, each will have a semicircularhole in it, representing one-half the frustrum of a cone,whose dimensions correspond exactly with those of thecore print on the pattern. These are now to be takenfrom the chuck and nailed and glued, one on each end ofthe body of the… … Fig. 42. longer than the pattern, so that the cope of the mold willbe sure to fit tightly around the core; then no metal canflow up alongside of it and over the end of the core,thus covering up the vent and causing the casting toblow. For the above reason all Vertical cylindrical coresshould be…
Patternmaking
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