Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . h, F = 2P to 3P. For cut teeth, P = 3Pi to 4P. (66) (67) The usual method of handling these formula is as follows: The pitch circles of the proposed gears are known or can be assumed;hence W can readily be figured, also the speed of the teeth, whence S canbe read from the table. The desired relation of F to P can be arbitrarily liosen, when P and y become the only unknown quantit
Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . h, F = 2P to 3P. For cut teeth, P = 3Pi to 4P. (66) (67) The usual method of handling these formula is as follows: The pitch circles of the proposed gears are known or can be assumed;hence W can readily be figured, also the speed of the teeth, whence S canbe read from the table. The desired relation of F to P can be arbitrarily liosen, when P and y become the only unknown quantities in the shrewd guess can be^made for the number of teeth, and y calculated there-from. Then solve the equation for P which will undoubtedly be the nearest even pitch, or, if it is desired to keep an even diametralpitch, the fractional pitch that will bring an even diametral pitch. Now,from this final and corrected pitch, and the diameter of the pitch circle,calculate the number of teeth N in the gear. Check the assumed value of yby this positive value of N. Another good way of using this formula is to start with thepitch and face desired, and the diameter of the pitch circle. In. Fig. .37 this case W is the only unknown quantity, and when found can becompared M-ith the load required to be carried. If too small,make another and successive calculations until the result approxi-mates the required load. SPUR GEAR Rin, ARHS, AND HUB. ANALYSIS and THEORY. The rim of a gear has to transmitthe load on the teeth to the arms. It is thus in tension on one sideof the teeth in action, and in compression on the other. The sec-tion of the rim, however, is so dependent on other practical con-siderations which call for an excess of strength in this respect, that •ST 122 MACHINE DESIGN it is not considered worth while to attempt a calculation on tins- Gears seldom run fast enough to make necessary a calcnlationfor centrifugal force ; and in general it can be sai
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