Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . one willbe driven through an angle which is known, sincethe circumferential velocities of the circles whoseradii are F G, FH must be equal. Consequently,the relative positions of the axes of the cylindricalpin and of the required tooth may be determinedat any phase of the action, and their common per-pendicular found. Having repeated this process asufficient number of times, these common perpen-diculars will evidently be the radii of the transverse sections of the required tooth to wor
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . one willbe driven through an angle which is known, sincethe circumferential velocities of the circles whoseradii are F G, FH must be equal. Consequently,the relative positions of the axes of the cylindricalpin and of the required tooth may be determinedat any phase of the action, and their common per-pendicular found. Having repeated this process asufficient number of times, these common perpen-diculars will evidently be the radii of the transverse sections of the required tooth to work with apin of no sensible diameter, from which the meridian section may be constructed, and from it theoutline of a working tooth derived in the usual manner by assigning any diameter at pleasure to thecylindrical pin. This arrangement may also be modified as in Fig. 2148, the cylindrical pins being fixed in theperiphery of a cylinder, from which they project radially; the construction of the tooth of the otherwheel being made exactly as in the previous case. And it is hardly necessary to remark that in. 36 GEARING, FRICTIONAL. cither modification the cylindrical pins may be assigned to the conical wheel and teeth constructedfor the other. And finally, the same principles and methods may be applied to the construction of what may becalled bevel-face gearing, as shown in Fig. 2149. In this case the action is exactly the same as thatof two rolling cones, the axes of the teeth in one wheel being rectilinear elements of one, while thepins in the other project normally from the pitch-cone. C. W. MacC. GEARING, FRICTIONAL. As used in the lumbering regions in this country to transmit motionin wood-working machinery, frictional gearing usually consists of smooth-surfaced wheels in contact,one pulley being made of iron, the other of wood or iron covered with wood. Where it is practica-ble, the wooden pulley drives the iron, wear of the former being thus saved. For driving heavy ma-chin
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Keywords: ., bookauthorbenjaminpark18491922, bookcentury1800, bookdecade1880
