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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 31

An illustration from Wood pattern-making; the fundamental principles and elementary practice of the art, 1906, leaf 31 — of the mold. The amountof allowance usually made in common practice is 1-8 inchper foot, measured in all directions. But since thecoefficient of shrinkage is different for different metals,this is only approximate. The following allowances forthe different metals are made in the pattern when it… … Fig. 4. then, this allowance is 1/ i,< /lO inch ; for I/ For iron,brass, Wie inch; aluminum, }{ inch, and for steel, 74inch; the general amount, which is in the center of thegroup, is /8 inch. It must not be understood by thisthat these metals will always, and under all conditions. GENERAL…

Patternmaking

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