Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . labor; but a converse difficulty of equal if net greater magnitude is encountered if we reverse theprocess: for if the meridian section of the screw be assumed, we have to determine the form of awheel-tooth which shall work with an oblique section of the thread as a rack-tooth; and this alsowill result in a non-symmetrical outline, the fronts and backs of the tooth being different, if thescrew-thread lie symmetrical in the first place. The wheel, then, having all its transverse section
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . labor; but a converse difficulty of equal if net greater magnitude is encountered if we reverse theprocess: for if the meridian section of the screw be assumed, we have to determine the form of awheel-tooth which shall work with an oblique section of the thread as a rack-tooth; and this alsowill result in a non-symmetrical outline, the fronts and backs of the tooth being different, if thescrew-thread lie symmetrical in the first place. The wheel, then, having all its transverse sectionsalike, is similar to one of those used in Ilookes gearing, its teeth having a twist dependent on theobliquity of the screw. And in relation to this, it will be noted that the pitch of the screw is not,as in the case at first considered, either equal to or necessarily an exact multiple of that of the wheel-teeth. The elementary helices on the two pitch-cylinders must evidently coincide when developed on thecommon tangent plane; and the mode of determining the pitch of the screw, and also that of thewheel
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