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  • Users: engtiuser
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  1. engtiuser

    Zinc Phospate in steel

    We have some carbon steel parts which need to be protected from corrosion. The part has internal threaded section about and inch in diameter. The parts are to be installed under the car and will be exposed to contaiminates. We are looking for the best and cost effective way to protect the part...
  2. engtiuser

    Control of Spring characteristics

    If there is no accelerated test available to verify what I need, just post it and so be it. My question is straight forward and the answer should reflect that. I don't think I ever asked for the reason why the spring relax or comment for the robustness of the design. There are propriety...
  3. engtiuser

    Control of Spring characteristics

    We specified the load verses displacement requirement in the drawing together with dimension and full material specification. Each spring we received, together with the CFC, must have a serial number together with force/displacement tested report (issue by third party independent lab). This...
  4. engtiuser

    Control of Spring characteristics

    You are hitting the nail right in the head. We have been using the spring for a couple of years and the springs are all well behaved, until recently the supplier changed and we started seeing problem. The spring needs to be manufactured correctly and that's the part I want to verified. There...
  5. engtiuser

    Control of Spring characteristics

    I am not prepare to pay anything as this is a pure information exchange forum and I am not sure if EngTips support soliciting activities. I was thinking there should be some sort of standard industrial accelerated test to verify the creep characteristic and I don't think the full spec of my...
  6. engtiuser

    Control of Spring characteristics

    Thanks for the reply to try to help me to determine if the 30% relaxation is reasonable or not. Whether the spring should relax 30% over the period is not my concern. However, my question was raised from the validation and verfication aspect. I am looking for the industrial standard test...
  7. engtiuser

    Control of Spring characteristics

    The spring supposed to be preset 2 times at solid height for 1 minute. Then, the spring will then be shot peened 100% fully saturated on surface follow by powder coating. The spring is made out of AISI 5160 H steel. The spring is pneumetic driven and the force applied should not be over as...
  8. engtiuser

    Control of Spring characteristics

    We have an application where a helical compression spring is used in clamping application for an industrial robot. We found that the clamping load was dropped in about 30% in just 6 months. The temperature around the spring should not be higher than 70C. We verified the spring provided by the...

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