Spring selection

[joeTTU]

For Intro to Design I am working a problem where I need to find the volume of a spring. The instructor hinted that you CANNOT use volume of a cylinder and subtract inner diameter. Please help. Thanks

[stewartcs]

For Intro to Design I am working a problem where I need to find the volume of a spring. The instructor hinted that you CANNOT use volume of a cylinder and subtract inner diameter. Please help. Thanks

What information is given in your problem statement?

CS

[joeTTU]

NVM got it the formula for vol is =(pi*d^2)/(4)*pi*D*Nt

Nt=# of turns

[stewartcs]

NVM got it the formula for vol is =(pi*d^2)/(4)*pi*D*Nt

Nt=# of turns

Correct!

CS

[joeTTU]

Let me ask you this though any insight in what you consider design goals for springs with static loading?

[stewartcs]

Let me ask you this though any insight in what you consider design goals for springs with static loading?

Well off of the top of my head I would say the spring constant, material (e.g. will it be used in a corrosive environment), and dimensions. Probably some more that I can't think of right now!

CS

[FredGarvin]

On top of what Stewartcs mentioned, free height vs. solid height vs. working height are very important. Also, in static springs, stress relaxation is always a concern.