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  1. #1
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    Question Finding the correct angle

    Im trying to build a set of ramps for a heavy duty truck to drive on. Im using 4" X 4" X 1/4 square tubing. the length is 12' and the height is 2' 6" with a 4' deck on top for the rear axles. I need to find the formula to achieve the correct angle for the incline. thank you in advance for any help.


    4'
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    2' 6" █



    ████████████████████████████████████████████
    12'

  2. #2
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    Default

    Is this what you’re after?
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  3. #3
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    Default

    Delta=17 21'14"
    or the arctan of 2.5 / 8
    was my guess because it looked like the top was 4'
    otherwise it's the arctan of 2.5 / 12 = 11 46'06"
    Last edited by UH60LCHIEF; 01-22-2010 at 01:11 PM.
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  4. #4
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    Default

    With 4-foot height.
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  5. #5
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    Default

    I Concur with UH60LCHIEF on the Delta
    The hypotenuse for 8’ x 2’-6” would be 8’ - 3 13/16” Delta of 17 21’ 14”
    The formula is the Law of Sin

    Fab Tech
    Fab Tech

  6. #6
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    Default

    Quote Originally Posted by Sonora Iron View Post
    Is this what you’re after?
    You forgot to subtract his 4' deck from the 12' overall length.
    Blondie (Owner C & S Automotive)

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  7. #7
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    Default

    Or you could just snap a couple chalk lines on the shop floor & measure it.
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  8. #8
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    Quote Originally Posted by FabTech View Post
    I Concur with UH60LCHIEF on the Delta
    The hypotenuse for 8’ x 2’-6” would be 8’ - 3 13/16” Delta of 17 21’ 14”
    The formula is the Law of Sin

    Fab Tech
    There's a whole pile of different ways to solve a trig problem. I just used ARCTAN theta (or Tan ^-1) of the ratio of the sides Opposite / adjacent, but law of sines does the trick just the same. You could use Pythagorean theorem to solve the hypotenuse and use any number of other functions as well. There's always like a million ways to skin a cat with a trig problem. Or like MMW said you could just snap a few chalk lines and break out a protractor. My calculator just happened to be sitting right there when I read it. Either way I hope that helps
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  9. #9
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    Quote Originally Posted by Blondie_486 View Post
    You forgot to subtract his 4' deck from the 12' overall length.
    I was a little confused on exactly what he was trying to do! And the drawing wasn’t real clear, to me anyway.






    http://www.analyzemath.com/Geometry_...alculator.html
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  10. #10
    Join Date
    Jan 2010
    Location
    Houston Tx
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    6

    Default Ramps

    Thanks for all the replies. Im trying to save to got to welding school so I can eventually answer my own questions. The ramps have to have a 4' deck for the rear axles. Purpose being that the heavy duty truck is a industrial vacuum truck that has to offload into a 25 yard roll off container.
    Last edited by XLMFAB; 01-23-2010 at 08:43 AM.

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