A 63.5 mm shaft having a yield point of 50 ksi with a ¾ inch width key. Compute the length of key in order to transmit the torque on the shaft. The shearing stress of key is 22 ksi and use factor of safety of 2. (Ans: 3.72 in)

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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.