Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . cting the diagram, Fig. 2075, thus: Let D be the driver, and P 0 its arc of approach, which is GEARING. equal to PL, that of the follower. Taking any point Z on D P as the centre of a describing circle,draw the epicycloid L R by rolling it on the outside of L P B, and the hypocycloid 0 R by roiling itwithin 0 P G. These curves are respectively the face of the followers tooth and the flank of thedrivers. Draw the radius P C, cutting the pitch-circle of the follower in S: if L iS be just
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . cting the diagram, Fig. 2075, thus: Let D be the driver, and P 0 its arc of approach, which is GEARING. equal to PL, that of the follower. Taking any point Z on D P as the centre of a describing circle,draw the epicycloid L R by rolling it on the outside of L P B, and the hypocycloid 0 R by roiling itwithin 0 P G. These curves are respectively the face of the followers tooth and the flank of thedrivers. Draw the radius P C, cutting the pitch-circle of the follower in S: if L iS be just half thethickness of the tooth, the construction is so far possible, but the followers teeth will be pointed;if L S be less than that, the teeth will be topped off, but if greater, the size of the describing circlemust be increased or the arc of approach diminished. The construction of the remainder is precise-ly like that of Fig. 2073, above explained. We have here assumed possible conditions, and theaction is readily traced. The arrows indicating the direction of the rotations, the drivers flank
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