PROBLEM An engine running at 200 rpm drives a line shaft by means of a belt. The engine pulley is 750 mm diameter and the pulley on the line shaft being 450 mm. A 900 mm diameter pulley on the line shaft drives a 150 mm diameter pulley keyed to a dynamo shaft. Considering a slip of 2% at each drive., determine the following: Required: Speed of Pulley # 2 on the Line Shaft (N₂) Speed of Pulley # 3 on the Line Shaft (N₁) Speed of Pulley # 4 on the Dynamo Shaft (N4) FIGURE 750 mm Engine shaft 900 mm 450 mm Line shaft With Slip % -150 mm 44 Dynamo shaft SOLUTION Without Slip%

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A:

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A:

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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.