e warping will be reduced to the minimumbecause the alternate pieces are inclined to warp in oppo-site directions. A good way to support patterns of this general shapeduring the process of molding is illustrated by the lowerpart of Fig. 25. The additional pieces B and C are calledcounter ribs. The… … Fig. 25. molder that they are to be stopped off in the mold. When -ever possible these should be put on the pattern so theywill come in the nowel of the mold; these are also calledstop-off pieces. Another way of building patternsthat are round and flat and are supported by segmentsrunning around…
Patternmaking
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