Design a right angled bell crank lever. The horizontal arm is 500 mm long and a load of
4.5 kN acts vertically downward through a pin in the forked end of this arm. At the end of
the 150 mm long arm which is perpendicular to the 500 mm long arm, a force P act at
right angles to the axis of 150 mm arm through a pin into a forked end. The lever consists
of forged steel material and a pin at the fulcrum.
Take the following data for both the pins and lever material:
Safe stress in tension = 75 MPa Safe stress in shear = 60 MPa
Safe bearing pressure on pins = 10 N/mm2
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