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Math Help - Boom Arm Math

  1. #1
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    Smile Boom Arm Math

    Hi
    I'm desgining a projector screen boom arm for a college project and need help with some math.

    http://i54.photobucket.com/albums/g1...oomarmhelp.jpg

    I need help in working out B and D from the image I have attached.

    The load is 30kg and the span in 12'

    Any help work be great!

    thanks
    Michael
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  2. #2
    Super Member
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    Nov 2007
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    Trumbull Ct
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    Hello Michael,
    A similar problem
    A 2000 lb weight is attached to a 20 ft boom which is supported to wall and by a cable attached 11.5 ft above the lower mount. A force diagram shows a 4000lb tension in the cable 2000 lb downward force at the beam attachment and 3464 lb compression in the beam . This is what you need to do for your problem.The distance between the supports must be determined by you .You might try 4 ft. Stresses at the hinges and wall supports have to be calculated
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  3. #3
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    bjhopper

    Thanks for the help.
    How did you come up with 4ft?
    Sorry but i'm really rusty with my maths!
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  4. #4
    Super Member
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    Hi Michael,
    As the designer you have to make the decision based on wall or structure attachment and secondly to minimize the costs of materials,4 looks a reasonable start


    bjh
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