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Wood pattern-making; the fundamental principles and elementary practice of the art (1906)

Purfield, Horace Traiton · Ypsilanti, Mich., The Scharf tag, label & box co. · leaf 52

An illustration from Wood pattern-making; the fundamental principles and elementary practice of the art, 1906, leaf 52 — CHAPTER VI. CORKS. When castings with holes through them, orwith internal cavities, are to be made, a pro-jecting body of sand must either be made in themold at the same time as the rest of the mold, or else beintroduced into the mold after the pattern is removed orpulled out. These projecting… … Fig. 8. Fig. 9. and leave a core, or cores, as a part of the mold, it is saidto leave its own core or cores. This is illustrated by Figs.8 and 9. Fig. 8 represents a pattern that has beenmolded and removed from the mold; (Fig. 9) leavingcore (a) projecting above the lower surface of the mold.When…

Patternmaking

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