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Design a suitable ordinary rigid flange coupling to connect an electric motor to a reduction gear of a machine. The motor has a rated output of 80 hp at 600 rpm. Working stresses in materials to be used for different parts are

Flange (C.I): shear 1700 N/cm2 compression 8400 N/cm2

Shaft (M.S) : Shear 4750 N/cm2

Bolt, Key (M.S): Shear 5800 N/cm2, compressions 9000 N/cm2.

These values take into account the service factor and w weakening effect of the keyway.

Square keys are recommended for fixing the flanges on the shafts. For your calculations you may assume

Number of bolts  = 4

Outside diameter of hub   = 2d

P.c.d. of bolts = 3d

Width and depth of key = d/5

where d is the diameter of the shaft.

Make a fully dimensioned sketch of the coupling (one view only)

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