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Math Help - how to calculate the length of this bar?

  1. #1
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    how to calculate the length of this bar?

    Hey guys,

    I am not sure if this question belongs to this forum but i am going to ask it anyways.

    Imagine that you have a 45 feet cylinder and inside you have 2 bars. from top to bottom the bars don;t go straight down instead the bars the bars get into the bottom by going around the whole cilinder (similar to a spiral shape).

    My question is, how do i compute the length of any of those 2 bars?, for sure it should be longer than the whole cylinder but i have no idea.

    In the attached file, there are the details. It says that every 16 ft it makes a complete revolution.

    Please let me know if anyone knows about this.

    Thanks
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  2. #2
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    Quote Originally Posted by lgarcia View Post
    Hey guys,

    I am not sure if this question belongs to this forum but i am going to ask it anyways.

    Imagine that you have a 45 feet cylinder and inside you have 2 bars. from top to bottom the bars don;t go straight down instead the bars the bars get into the bottom by going around the whole cilinder (similar to a spiral shape).

    My question is, how do i compute the length of any of those 2 bars?, for sure it should be longer than the whole cylinder but i have no idea.

    In the attached file, there are the details. It says that every 16 ft it makes a complete revolution.

    Please let me know if anyone knows about this.

    Thanks
    I've attached a sketch how to calculate the length of one bar.

    You have to know the radius of the cylinder (if I read your drawing correctly r_{eff} = 1'-6" = 18")

    With a length of 45' and 16' per revolution you have to roll out and lay flat \frac{45}{16} revolutions. Then the bar describes the diagonal of the rectangle.
    Attached Thumbnails Attached Thumbnails how  to calculate the length of this bar?-barincyl.png  
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  3. #3
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    Thanks a lot!. i really had no idea on how to solve this... thanks a lot again!
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