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Recent content by jackpot

  1. jackpot

    Spring Design Software - packages help

    Just a heads up on the old GSDS5 software - there are many critical errors in this program - one for example is the E modulus for CrSi - for some reason it is just a little less than 30000000 ?? And the torsion spring program is baffling. This error and many others have been corrected in the...
  2. jackpot

    compression spring fatigue/life

    SMI's ASD 6.0 software performs fatigue calculations for valve quality wire, music wire and some SS. I'm assuming that the material is 302 SS. According to the ASD software the fatigue life for this spring is less than 100K cycles. You can download a free three day trial of the software at...
  3. jackpot

    a spring to work at 700 to 750 ¦C

    In addition to the previous post: The load requirement is 0.3 Kg for all length - This is confusing as the loads on compression springs typically increases with the amount of deflection (unless the spring is cracked). As the design sits the spring will go solid at about 5% of material minimum...
  4. jackpot

    coil spring material

    The amount of chrome was curiously left out of your material report. Ni Span 902 is the best fit but it has nominally 5.25% Cr. Have a lab recheck the material for Cr. Jack
  5. jackpot

    "Set" height calculation

    Also, as some springs are scragged or "set" the diameter may increase - if the dimensions are critical to the application this increase must also have to be considered. Jack
  6. jackpot

    Torsion springs used in the reverse direction

    Does anyone have any experience on using torsion springs in the reverse direction. I know that it is not adviseable to do so, but are there any rules / formulas that apply to this type of operation? Thanks, Jack
  7. jackpot

    What type of plating to use?

    This assembly is used in an aerospace application.
  8. jackpot

    What type of plating to use?

    If a steel spring (1080) comes in contact with 2024 aluminum will galvanic corrosion initiate (clean environment)? Would a zinc plating help minimize the risk. Thanks Jack
  9. jackpot

    Chromate Passivation

    Is it possible to perform Chromate Passivation by using Trivalent Cr process without depositing any Hex Chrome? If not, is the amount of Hex Cr typically acceptable for the limits imposed by the RoHS? And what are people in this country doing about this issue? Jack
  10. jackpot

    Coil Spring Design Basics

    I might recommend three books to consider: "Handbook of Spring Design" put out by SMI "Mechanical Springs" by A. M. Wahl or the "Spring Design Manual AE-11" by SAE Most springs that operate at temperatures below 250°F are made from a high carbon steel with a good surface finish called...
  11. jackpot

    I just can't pass this darn exam!!!

    I took and passed the metallurgy PE October 2003. Personally I thought that it was the hardest test that I ever took and I did not think that I passed. There was way too much transport theory stuff and thermodynamics which I have some sort of apptitude for (apparently). But I think that I passed...
  12. jackpot

    Baking on "hard" SS after pickling and passivation??

    All, I am confused, is it necessary to bake stainless steel parts that have been pickled and passivated? No one seems to be doing it. I'm specifically talking about sheet or wire that has been transformed by cold working into martensite, like full hard (40% red.) 302 SS or 17-7PH in the CH900...
  13. jackpot

    What is the "Ross Point"

    Does anyone have a good definition of the "Ross Point," it pertains to the stress on the eye of a leaf spring. Thanks, Jack
  14. jackpot

    Heat setting of compression springs?

    I am looking for information showing the advantages and disadvantages of heat setting compression springs for automotive application. Free length of 1.25" and Diameter of about 0.20" Chrome Silicon. Jackpot
  15. jackpot

    Spring material in 96% sulfuric

    The corrosion rate on sulfuric acid peaks at 12N or 31.4%. Adding inhibitors to the acid will help, but the main consideration, metallurgically speaking is, the amount of carbon in the steel that you select with lower being better. There are grades oof SS like 302L and 316L that have very low...
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