1. A pair of bevel gears has 18 and 90 teeth and is used on shafts that intersect each other at an angle of 75°. Determine the velocity ratio and the pitch angles of both gears.
2. A worm gearset is needed to reduce the speed of an electric motor from 3600 to 60 rpm. Strength considerations require that 16-pitch gears be used, and it is desired that the set be self-locking. Specify a set that accomplishes the task.
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