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  1. Replies
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    Wind Force Calculation

    Hi, Im trying to find the wind force acting on a flat surface. I keep coming up with two equations.

    F = A x P x Cd. A = The projected area of the item. P , Wind pressure (Psf), = .00256 x V^2...
  2. Thread: Spring Design

    by wj556
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    zeke, thanks that's what I was wondering. ...

    zeke, thanks that's what I was wondering.

    That would imply that the Rockwell hardness will affect the yield strength allowing the spring to bend farther and still be within the elastic range, but...
  3. Thread: Spring Design

    by wj556
    Replies
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    5,554

    Yes, I contacted several spring manufacturers and...

    Yes, I contacted several spring manufacturers and none of them were very helpful with any information. One did mention that they use about 50 Rockwell for their springs when finished, however.

    I...
  4. Thread: Spring Design

    by wj556
    Replies
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    I believe my material properties are in error, as...

    I believe my material properties are in error, as Dave suggested.

    However, the only material property in the bending equation is the modulus of elasticity.

    To the best of my knowledge the...
  5. Hi Randy, Another approach might be to use...

    Hi Randy,

    Another approach might be to use P-Lam 2" x 8" beams, the plywood looking type beams. I believe they are rated at a far greater load carrying capacity than standard pine, or cedar 2" x...
  6. Thread: Spring Design

    by wj556
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    5,554

    PinkertonD, my point was that with the most...

    PinkertonD, my point was that with the most likely candidates for material on the paper clip, 1095 or 1075, my numbers were not close. Obviously it does work because I have one sitting right in front...
  7. Thread: Spring Design

    by wj556
    Replies
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    5,554

    http://www.engineersedge.com/beam_bending/beam_ben...

    http://www.engineersedge.com/beam_bending/beam_bending9.htm

    This link is more appropriate, however, my results didn't seem correct. It seems that with less than .11" deflection on a beam that is...
  8. Thread: Spring Design

    by wj556
    Replies
    13
    Views
    5,554

    Spring Design

    Greetings,

    I need some help on a leaf spring that will be 3/8 wide by whatever thickness I need. Im looking for 50 pound of force at approximately .110 deflection.

    I would like it to be...
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