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A helical spring is to provide a minimum force of 600 N at installation and have...

A helical spring is to provide a minimum force of 600 N at installation and have a working deflection of 25 mm. The spring rate is 13 N/mm. The coil must fit in a 55 mm diameter hole with at least 2.5 mm clearance. Use a 6.5 mm diameter unpeened music wire with squared and ground ends. Using 15% clash allowance, find:-

i. spring constant

ii. free length of the spring.

iii. the ‘solid’ length of the spring

iv. Draw a Goodman diagram and determine the safety factor

Clearly state any assumptions made

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