Determine the Spring Design given Spring Stiffness of 400 N/m

AI Thread Summary
The discussion focuses on designing a spring with a stiffness of 400 N/m, an outer diameter of 0.25 inches, and a free length of 3 cm, while supporting a maximum load of 5 lbs. Key challenges include calculating the correct spring diameter to avoid over or under damping, ensuring the spring's stability to prevent buckling, and determining the necessary number of coils based on the specified stiffness. There is a clarification that the stiffness value of 400 N/m does not equate to 295 ft lbs, prompting a reevaluation of the units. The small size of the spring is intentional for the design requirements. Overall, the discussion highlights the complexities involved in spring design under specific constraints.
ftrflyr
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I am trying to design a spring given the following measurements:

Spring Stiffness is 400N/m or 295 ft lbs
Outer Diameter of spring is 0.25 in
Free Length is 3 cm or 1.18 in
Load is max: 5lbs

I am having trouble with:

Calculating the Spring Diamter so as the spring is not over damped or under damped
Ensuring the spring won't buckle
Determining the number of coils necessary knowing the spring stiffness

Any help would be great! Thanks!
 
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You've got bigger problems than that: k = 400 N/m is not equal to k = 295 lbs / ft.

Why such small springs?
 
Okay disregard the 295 ft lbs then. Small springs because the design is small. :)
 

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