The shaft in Figure P12–2 rotates at 200 rpm. Pulley A  receives 10 hp from below. Gear C delivers 6 hp to the  mating gear below it. Chain sprocket D delivers 4 hp to a  shaft above. Use SAE 1117 cold-drawn steel.  Find:  (a) Determine the magnitude of the torque in the shaft  at all points. (b) Compute the forces acting on the shaft at all powertransmitting elements.   (c) Compute the reactions at the bearings.

Describe the failure of a hollow torque tube. Calculate the forces creating the failure

3. Design Challenge: The wind turbine is designed to generate 2.5 MW of power with the blades rotating at 20 RPM. The large gear has 360 teeth and the small gear has 12 teeth. Design the high speed shaft to minimize weight. That is, choose a material (from your textbook) and cross-section dimensions such that the shaft won't yield, with a safety factor of 2.5, while keeping the shaft's weight to a minimum. Calculate the weight per meter of the shaft you designed. 2 Gear reducer High speed shaft Low speed shaft Generator

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