l building should bedone as explained for the pulley rim, that is, with seg-mental pieces of wood of the required size and thickness.As the cross section is of somewhat different shape, thesegments will of course vary also. If the gear is to belarge enough so that both sides can be gotten at at… … Fig. 56a. size of the gear. For gears up to two feet in diameter,pieces seven-eighths inch thick by three inches wide,will be heavy enough. The length of the arm will beequal to the radius of the rim only. These arms are to PATTEJRNS FOR CAST GKARS 111 be mitered and fastened to a disk a little…
Patternmaking
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