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
ced in position, and the cope is returnedto its place on the drag. In this case the core prints should be in length at least twicethe thickness of the metal through which the hole is to be cast,and the length of the cores will be equal to the thickness of the metalplus the length of the prints.… … Fig. 120. Sheave TwWey .removable from the sand, 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…
Patternmaking
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