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Metals Used in Pattern Construction
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boss brads built butt joint casting Cincinnati Milling clamps cope cope and drag core-box construction core-box equipment core-prints cylindrical detail diameter dovetail joint dowel dowel-pins draft drag dry sand core eastern white pine employed engine fillets finished flange flask foundry glued green sand core hand plane holes horizontal I.—Design inch per foot—approx indicated in Fig layout located loose pieces lumber machining allowance mahogany master-pattern match-plate material metal patterns method of constructing miter joints molding sand molten metal Mortise and tenon mounted one-piece pattern parting-line parting-surface pattern and core-box pattern construction pattern department pattern design pattern equipment pattern storage patternmaker pins pipe placed plane plate portion position possible pouring Problem production rammed redesigned removed sample screws shape shellac shown in Fig shrinkage skeleton pattern steel straightedge sugar pine surface surface plate sweep tern tion tool turbine two-piece pattern vertical warping wood wooden pattern