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Thread: A rigger looking for help!

  1. #1
    Associate Engineer
    Join Date
    Sep 2016
    Posts
    2

    Confused A rigger looking for help!

    Hi everyone,

    I am hoping you could help me with a formula to find what the lifted load would be when removing a boom and stick from an excavator in one piece? I have the COGs of both components and have calculated the combined COG, I have the measurements from the lift point to COG and fulcrum to COG.

    The formula I have been using is:

    X = X2 x Y2/Y1

    Where:

    X = lifted load
    Y1 = distance from fulcrum to lift point
    Y2 = distance from COG to lift point
    X2 = total weight of object.

    I might be way off here and any help is appreciated. Just trying to get better.

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,066
    Yes... that simple equation will help you to locate your lift point relative to the CG.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Associate Engineer
    Join Date
    Sep 2016
    Posts
    2
    Thanks Kelly....

  4. #4
    Associate Engineer
    Join Date
    Apr 2017
    Posts
    1
    Usually, the excavator boom already has welded lifting hooks in place so you can lift the load in a balanced state.

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