A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 88
Fig. 87 When the drawing of a machine problem is com-pleted, it is first sent to the patternmaker, who makesa model in wood from it. He must know from ex-perience the amount of material to allow for shrinkage gPiN Key … Fig. 88 of the casting in cooling, how much to allow for polish-ing or finishing, and how much taper for draft inwithdrawing the pattern from the mold. The patternis then sent to the foundry, where it is molded in sand.After the form has been made it is poured, that is. 86 A PRACTICAL COURSE IN…
Mechanical drawing
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