le andtooth curves, and also on which the spacing of the teethmay be done. When the blocks have been glued on andallowed to dry, the whole of the work should be put in thelathe, the ends of the teeth blocks turned off even with theedge of the rim, and the face turned down to the patte:rns for cast… … A Pitch circle B Addendum circle C Base circle D Whole depth circle E Working ciepth circle f Radius = l-4th of pitch circle Q Radius = l-4th of pitch radius M Center of gear Fig. 60There are several ways of laying: out the tooth curveson the pattern. First, however, it must be decided whatmethod…
Patternmaking
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