3. A close coil helical spring is to have a mean coil diameter to wire diameter ratio of to. The stiffness of the spring is to be 20 N/mm. The spring will carry an axial load of 500 N and the maximum shearing stress is not to exceed 80 MPa. Calculate the diameter of wire and coil, number of coils and the deflection under the Load. (G = 84 GPa).

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3. A close coil helical spring is to have a mean coil diameter to wire diameter ratio of to. The stiffness of the spring is to be 20 N/mm. The spring will carry an axial load of 500 N and the maximum shearing stress is not to exceed 80 MPa. Calculate the diameter of wire and coil, number of coils and the deflection under the Load. (G = 84 GPa).

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