Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . her thatthis combination has been called a modification of Ilookcs gearing. Erroneously, however; for notonly are the axes here in different planes, not only may the velocity ratio be varied without changingthe diameter of either pitch-circle, but the absolute forms of the teeth of the two wheels arc differ-ent, and must be, in order to transmit the rotation with a perfectly constant velocity ratio by theBcrew-like action, which in this case is the effective means. For instance, the wh
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . her thatthis combination has been called a modification of Ilookcs gearing. Erroneously, however; for notonly are the axes here in different planes, not only may the velocity ratio be varied without changingthe diameter of either pitch-circle, but the absolute forms of the teeth of the two wheels arc differ-ent, and must be, in order to transmit the rotation with a perfectly constant velocity ratio by theBcrew-like action, which in this case is the effective means. For instance, the wheel shown in and 2131 has teeth of the involute form, the meridian section of the screw being therefore arack with sloping teeth, and the screw- itself a true oblique helicoid; and such a helieoid it willalways be, whatever the diameter or number of threads: the outlines of these threads or teeth inall its transverse sections will conseqiu ntly be Archimedean spirals, and not involutes. While there-fore it may be that two wheels of Ilookcs form, both having involute teeth, will work together by. 2132
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