As in Ex. 154, design a cylindrical worm-gear mesh to

Chapter 15, Problem 15.15

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As in Ex. 154, design a cylindrical worm-gear mesh to connect a squirrel-cage induction motor to a liquid agitator. The motor speed is 1125 rev/min, and the velocity ratio is to be 10:1. The output power requirement is 25 hp. The shaft axes are 90 to each other. An overload factor Ko (see Table 152) makes allowance for external dynamic excursions of load from the nominal or average load W t . For this service Ko 5 1.25 is appropriate. Additionally, a design factor nd of 1.1 is to be included to address other unquantifiable risks. For Probs. 1515 to 1517 use the AGMA method for (W t G)all whereas for Probs. 1518 to 1522, use the Buckingham method. See Table 1512.

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