A 1000mm cast iron pulley is fastened to a 112mm shaft by means a 28mm square key 160mm long. The key and shaft are SAE 1030 steel annealed with allowable shearing of key at 200MPa and compressive of 660MPa. a. What force in lbs acting at the pulley rim will shear the key? b. What force in the lbs acting at the pulley rim will crush the key?

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Design of Shafts and Shaft Components

The shaft is basically defined as the machine element that rotates, is in circular cross-section, it is majorly used to transfer the power from one part of the system to another, or from a power generating machine to a power absorbing machine. The shaft is supported on bearings and is rotated with the help of a set of gears or pulleys that are used for the power transmission. Bending moment, torsion, and an axial force act upon the shaft. Designing of shaft primarily involves determining stresses at a critical point in the shaft that is arising due to loading.