Fig. 36 (a). If it is made in this way, itmay be molded and leave its own core, but the hole can- SPECIAL TYPES OF PATTERNS 69 not be made parallel. It is usual to allow double theamount of draft on the inside for all small cores similarto this one. This would make considerable more workfor the… … Fig. 36 (a) Up a block of wood that is at least 3Mx3%x7 incheslong. The best way to do this is to use two pieces 1/4inches thick, and one piece three-fourths inch thick, glu-ing them all together, with the thinner one in the middle.In gluing up work of this kind, it is always best to havethe…
Patternmaking
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