Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . , thus forming our rack-tooth ab, and determine the outline of the wheel-tooth. The positionof every point in the outline of the rack-tooth with respect to the axis of the screw being known,the helices described by these points may lie drawn and the meridian section of the screw the figure it will be observed that the sides of the rack-tooth are straight and sloping, the teethof the wheel being therefore involutes. But the two sides of the rack-tooth are not similarly si
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . , thus forming our rack-tooth ab, and determine the outline of the wheel-tooth. The positionof every point in the outline of the rack-tooth with respect to the axis of the screw being known,the helices described by these points may lie drawn and the meridian section of the screw the figure it will be observed that the sides of the rack-tooth are straight and sloping, the teethof the wheel being therefore involutes. But the two sides of the rack-tooth are not similarly situa-ted in relation to the axis, and in consequence the meridian outline of the screw-thread will not besymmetrical, nor will it be bounded by right lines. Nevertheless, since its acting sections possess theproperty, before mentioned, of admitting a change in the distance between the axes without affectingthe velocity ratio, it is necessary that the screw should lie formed as above explained if it is re-quired to cut its own wheel with absolute precision. The determination of its form involves some
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Keywords: ., bookauthorbenjaminpark18491922, bookcentury1800, bookdecade1880
