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Recent content by amtrak17

  1. amtrak17

    Knurled Interference Fit Analytical Analysis

    Thanks to all for the comments and answers. This is resolved for me now. Looks like testing will be the only way to have a reliable estimate.
  2. amtrak17

    Torque Required to Strip Aluminum Thread

    I agree with MikeC88's calcs and comments above. I changed my friction coefficients to give the same 0.52 K value and got the same. This is a more conservative assumption on the resulting pre-load due to torque. Ultimately the hardest part is going to be obtaining an appropriate K value that you...
  3. amtrak17

    Torque Required to Strip Aluminum Thread

    Right, friction coefficient is based on material surface properties alone, nothing else. Also note that friction coefficient and K (torque coefficient) are not the same thing. You will have to calculate K from friction coefficient based on JIS B 1803 or similar formula. Also keep in mind that...
  4. amtrak17

    Knurled Interference Fit Analytical Analysis

    Those are good ideas, and I think your understanding of the mechanics of the fit are correct. The operational loading is purely torque. I am performing a Monte-Carlo type analysis to simulate the range of shaft/bore diameters and come up with a statistical range of interference at that press-fit...
  5. amtrak17

    Torque Required to Strip Aluminum Thread

    There are pretty good friction coefficient tables out there. If you actually have the 2 materials on hand you could simply measure the true friction coefficient by placing a block of one on top of a block of the other and seeing at what angle the top block slides. Static friction coefficient =...
  6. amtrak17

    Torque Required to Strip Aluminum Thread

    I would approach this by the method outlined in MIL-HDBK-60 (Also found in Machinery's Handbook). You can solve for your applied load based on torque of 16 N-m and an appropriate k value. Be sure to factor in error for load accuracy based upon which method you are using to torque. A torque...
  7. amtrak17

    Knurled Interference Fit Analytical Analysis

    thread404-213125 I am looking for a way to analytically determine stresses on a knurled interference fit. The referenced thread above was seeking the same, but unfortunately no one actually answered the original question. I am not interested in whether or not a knurled press fit is a good idea...

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