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  1. iceblink

    RBE3 problem or something else !?

    I wrote down the equations but at the end i'm still off by a factor of 2... http://files.engineering.com/getfile.aspx?folder=a26932b6-07b4-42f2-a2c3-ff6746e016c4&file=rbe3_eqs.pdf
  2. iceblink

    RBE3 problem or something else !?

    The site moved to a new domain past weekend. You can find the file here now. Why is the moment absorbed at point 1 two thirds of the total moment? I'm looking for the math behind that.
  3. iceblink

    RBE3 problem or something else !?

    It's not quite that simple... Using your numbers: Moment around x-axis in CG: -6 * 1 + 3 * -2 + 3 * 1 = -9 Moment around z-axis in CG: -6 * -1 + 3 * -1 + 3 * 2 = 9 But we should have found the Mcg which is -12 around x-axis and 12 around z-axis. The correct forces due to the moment are -8...
  4. iceblink

    RBE3 problem or something else !?

    Hmmm I don't see how Mcg is wrong... My example is almost 2D so it can be drawn on a sheet of paper. Load is applied in (3,3) and is 6 into the paper. CG is in (1,1). That means the moment around vertical is the force multiplied with the horizontal distance, so 6 * (3-1) = 12. Moment around...
  5. iceblink

    RBE3 problem or something else !?

    I've tried to reproduce loads in an RBE3 with hand calculations, and I can see that the results are wrong, but I fail to see why. Can someone have a look and tell me what i'm doing wrong? http://communities.ptc.com/servlet/JiveServlet/download/271683-78849/Mathcad%20-%20rbe3.pdf p1-p3 are the...
  6. iceblink

    ASME BTH-1 and bolts

    We are bolting a lifting eye to a machine for transport. After transport the lifting eye is re-used for the next machine. Force is transferred by friction only. Now we are looking at ASME BTH-1 (2008) to check the strength. (I saw there is a 2011 version and ordered it, but this is typically...
  7. iceblink

    asme bth-1

    Can anyone point me to a European counterpart of the ASME BTH-1 spec? Preferably British, but other EU will also do. I'm looking into a lifting eye that is bolted to a machine, where the bolts provide a friction transfer of the load.In ASME BTH-1 the maximum allowable load is n*0.26*A*Fu /...
  8. iceblink

    Bolt shear in overhead lifting application

    Can anyone point me to a European counterpart of the ASME BTH-1 spec? Preferably British, but other EU will also do. I'm looking into a lifting eye that is bolted to a machine, where the bolts provide a friction transfer of the load. In ASME BTH-1 the maximum allowable load is n*0.26*A*Fu /...

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