Finding the correct angle

[XLMFAB]

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" █
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12'

[Sonora Iron]

Is this what you’re after?

[Blondie_486]

Is this what you’re after?

You forgot to subtract his 4' deck from the 12' overall length.

[Sonora Iron]

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

[XLMFAB]

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.

[Rick C]

I find this construction calculator to come in handy for thing like this.
Put in the rise and the run it calculates angle and the length of the unknown.
http://www.sears.com/shc/s/p_10153_1...ion+calculator

Rick C

[Sonora Iron]

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.

Is this what you’re trying to do? How are you going to brace that ramp? Then how are you going to move them, with the square tube weighing in at 12.21 pounds per foot?

[Bodybagger]

Thanks for all the replies. Im trying to save to got to welding school so I can eventually answer my own questions.

I think you'll be disappointed if you go into a welding program expecting to master geometry and trigonometry.

As for remembering mnemonics for solving certain triangles... forget about words. Just learn the simplest trigonometric figure. The unit circle.



The radius is 1, so the hypotenuse is always 1. Makes things easy. Note that the point on the circle has an X coordinate equal to the cosine of the angle. It has a Y coordinate equal to the sine of the angle. And the slope of the hypotenuse is analogous to the tangent of the angle... which is rise over run (everybody knows slope is rise over run - even roofers). And rise over run happens to be Y/X.

The more you learn about trigonometry and higher math, the more you realize this circle is the ultimate cheat sheet. It tells you the formulas to everything.

[m.k.swelding]

We made a set one time but we made it with 16''x 16'' hardwood saw logs.
Just an idea

[UH60LCHIEF]

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"