mechanics of machines

May 20th, 2015
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TUTORIAL EMG 2413 MACHINE DESIGN(a) State four uses of shaft couplings (b) State four requirements of a good shaft coupling (c) Briefly describe the classification of shaft couplings(d) A 15 kW, 960 r.p.m. motor has a mild steel shaft of 40 mm diameter and the extension being 75 mm. The permissible shear and crushing stresses for the mild steel key are 56 MPa and 112 MPa. Design the keyway in the motor shaft extension. Check the shear strength of the key against the normal strength of the shaft.(e) A steel spindle transmits 4 kW at 800 r.p.m. The angular deflection should not exceed 0.25 per meter of the spindle. If the modulus of rigidity for the material of the spindle is 84GPa, find the diameter of the spindle and the shear stress induced in the spindle.(f)

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