Pattern making; a practical treatise for the pattern maker on wood-working and wood turning, tools and equipment, construction of simple and complicated patterns, modern molding machines and molding practice (1921)
Ritchey, James, Monroe, Walter W. (Walter William), b. 1869 · Chicago, American technical society · leaf 72
may give some trouble to the beginner.The pattern is shown in cross-section in Fig. 121, and is molded ina two-part flask. At firstit would seem impossibleto place the pattern in thesand so that either halfcould be removed when thecope and drag are separated on the parting line of the pat-tern.… … Fig. 122. Piilley Mold Coped-Out for Ring usual way. After the drag is turned over, the sand is cut awayand removed to the center of the rim edge, as shown in Fig. 122.The cut is carefully smoothed, and parting sand applied to the 58 PATTERN MAKING cut surface. The part a of the pattern is placed…
Patternmaking
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