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Thread: Pulleys : How to get to MA 14:1 with as few pulleys as possible .

  1. #1
    Associate Engineer
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    Pulleys : How to get to MA 14:1 with as few pulleys as possible .

    Hi all,

    Im a Noob , and I need the help of the community to help me solve some of the issues I've been having with this recreational project I've been putting together.

    As the title suggests, Im trying to construct a setup to attain a 14:1 Mechanical Advantage with as few pulleys as possible. Im trying to move my load 5 inches

    Ive seen some concepts of compound and complex pulleys, but I cant quite wrap my mind around the setup .

    This is my very first post on this forum ,so forgive me if I lack the etiquette the community expects.

    Thanks and hope to hear from you all soon ,


    Dylan

  2. #2
    Technical Fellow jboggs's Avatar
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    Your question may seem clear to you, but is way too nebulous for those not familiar with what you're trying to do. The "fewest possible pulleys" answer will depend entirely on things you haven't mentioned. Research how to post a sketch and show us what you have in mind so far. We need geometry, loads, supports, any restrictions (physical, cost, weight, etc.).

  3. #3
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    I certainly shall . Thank you very much for your response.

  4. #4
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by jehuty8888 View Post
    I certainly shall . Thank you very much for your response.
    See: http://www.engineersedge.com/mechani...hines_menu.htm

    mid-way down on the webpage there are some pulley calculators and equations..
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  5. #5
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    This is the way I want it to work . I dont know where to apply the pulley blocks so it maximizes the use of each pulley block as well as giving me the clearance between each block to ensure I can pull my load 5 inches.

    Again , I am noob , so if theres anything you can give me help on , please let me know .
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  6. #6
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    Will a 2 ton chain hoist work?

  7. #7
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by Hudson View Post
    Will a 2 ton chain hoist work?
    2 tons = 4,000lbs and you're lifting 2,000lbs - so yes.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  8. #8
    Senior Engineer
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    Cool Simplest solution

    You can compound 4 x 2:1 simple setups using only 4 pulleys to get 16:1 advantage.



    Timelord
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  9. #9
    Principle Engineer
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    A differential chain hoist has only three pulleys and can be made to have a 14:1 mechanical advantage. Although an off the shelf model, what ever the ratio, is a much easier solution than making one from scratch.

    (And yes, I know that 2 tons provides a F.S. of 2.)

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