Problem #4 (25 pts) A 10 kW, electric motor runs at 970 rpm is to drive a lift through a right-handed wormgear reducer, as shown in the figure below. The reducer has a double-threaded worm and a 60-tooth wormgear. The worm has an axial pitch of 25.12 mm, a pitch diameter of 64 mm, and 20° normal pressure angle. The worm-gear set is made from high quality material. Roller Wormgear Electric motor Z X For the described system, solve the following questions: 1. For the lift (G) to go up, determine the direction of rotation of the electrical motor with respect to the input drive. [2 Points] 2. Determine the lead angle of the worm. [2 Points] 3. Determine the friction coefficient between the worm and worm gear. [2+2+2. Points] 4. Calculate the forces acting on the worm gear; draw a free-body diagram of the worm gear using the given point of view. [11 Points] 5. Determine the output torque and power delivered to the lift. [2+2 Points]

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problem 4 25 pts a 10 kw electric motor runs at 970 rpm is to drive a

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Problem #4 (25 pts) A 10 kW, electric motor runs at 970 rpm is to drive a lift through a right-handed wormgear reducer, as shown in the figure below. The reducer has a double-threaded worm and a 60-tooth wormgear. The worm has an axial pitch of 25.12 mm, a pitch diameter of 64 mm, and 20° normal pressure angle. The wor