. Foundry practice; a treatise on molding and casting in their various details. ring on the core andthe pressure it is to resist must act directly against itslength. When so placed that the pressure tends to moveit sidewise, the resisting power is only that of the sandaround the chaplet. The chaplet set in the drag must come to a bearingwhere it is to remain. Those in the cope extend throughand are held against the core by wedges or weights fromabove. Where the flask has a bottom board, the chapletsset in the drag may be pointed and driven into the bot-tom board, as shown at a and d, Fig. 57.
. Foundry practice; a treatise on molding and casting in their various details. ring on the core andthe pressure it is to resist must act directly against itslength. When so placed that the pressure tends to moveit sidewise, the resisting power is only that of the sandaround the chaplet. The chaplet set in the drag must come to a bearingwhere it is to remain. Those in the cope extend throughand are held against the core by wedges or weights fromabove. Where the flask has a bottom board, the chapletsset in the drag may be pointed and driven into the bot-tom board, as shown at a and d, Fig. 57. The head of thechaplet should conform to the shape of the core. If thehead is not shaped the same as the core at the point of io4 FOUNDRY PRACTICE bearing, the chaplet may cut into the core, thus notholding it in the proper position, or the bearing may beon one side of the chaplet, which may tip it over. Wherethe sand is very deep below the point where the chaplet isto be placed, or there is no bottom board to drive thechaplet into, a block may be rammed into the sand, as at. the base of c. The chaplet must be set vertical, for, ifslanting, the effect will be that shown at c. This chaplethas bearing only at the edge and will hold but little, asthe sand will crush beside the chaplet, allowing the coreto move. Where many chaplets of the same length areto be set, as in duplicate work, much time may be savedby ramming in the mold the chaplet stand shown at b. TOOLS, MACHINES, AND EQUIPMENT 105 When the pattern is removed, the chaplet may be placedin the stand, thus saving the adjustment of heightand driving to a firm bearing, as required in previouscases. There are many other conditions to be considered insetting chaplets in the cope. It is best to pass a ventwire through the cope at the point where the chaplet isto be placed, then gradually increase the size of the roduntil nearly the size of the chaplet, when it may be pressedthrough the sand. By thus slowly increasing the sizeof
Size: 1710px × 1462px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublish, bookpublisheretcetc
