Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . wheel. So also is the derived curve, which it is therefore unnecessary to construct. The appearanceof the combination is shown in Fig. 20S7, and it is open to the same objection as that mentioned inregard to the action of the faces of the wheel-teeth in Fig. 2080; that is, the whole wear is confinedto a single point on each pin, so that it makes no difference whether the pin be circular or not, asit will work equally well if made with flat sides perpendicular to the pitch line o
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . wheel. So also is the derived curve, which it is therefore unnecessary to construct. The appearanceof the combination is shown in Fig. 20S7, and it is open to the same objection as that mentioned inregard to the action of the faces of the wheel-teeth in Fig. 2080; that is, the whole wear is confinedto a single point on each pin, so that it makes no difference whether the pin be circular or not, asit will work equally well if made with flat sides perpendicular to the pitch line of the rack. Annular pin-gearing also furnishes two cases differing materially in appearance. If the innerwheel be the driver, the construction is as shown in Fig. 20S8, the elementary tooth P E being the in-ternal epicycloid generated by rolling the outer pitch-circle upon the inner, and the radius of the pinbeing determined as in Fig. 2085, the lettering corresponding throughout. If the annular wheeldrive, as in Fig. 2089, the face of its elementary tooth is the hypoeycloid generated by rolling thepitch-circle
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