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Need help from someone good with math or whatever this is lol

Discussion in 'Garage / Workshop' started by TCprerunner, Jul 17, 2013.

  1. Jul 17, 2013 at 10:14 PM
    #1
    TCprerunner

    TCprerunner [OP] Well-Known Member

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    I know I'm not good at this kind of stuff and figures someone could help me get this right the first time I'm making a rack for my truck..

    Uprights are 16" the top span is 48" and the bottom needs to be 59" from end to end here is a bad picture to illustrate

    [​IMG]

    I want it bent and do not have a bender so going to drop it off at a friends and have to give him want angles how would I explain this to him and what angle would that be to get the measurements all where I need them? I could do this on my own if I was just welding it but I want bends and they are making me feel stupid cause I can't figure out how to explain this in a simple way..
     
  2. Jul 17, 2013 at 10:24 PM
    #2
    Btnewman

    Btnewman Benjamin Newman

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    Find a drafting program, it will do the hard stuff for you
     
  3. Jul 18, 2013 at 7:15 AM
    #3
    Btnewman

    Btnewman Benjamin Newman

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    If no one helps with this, I can see if I can whip something out for ya, also, are your measurement all from the inside of the tube? Which size tubing are you running? And any idea what radius his bender is?
     
  4. Jul 18, 2013 at 7:48 AM
    #4
    TCprerunner

    TCprerunner [OP] Well-Known Member

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    I don't have a computer to run any program on.. Could not find one I could work on my phone the 16 " vertical is from my cut on the bottom to the middle the top 48" is from the middle of the bends and bottom is from middle to middle .. So middle? Lol
    Going to be using 1-1/4 sch 40 and no I do not know the radius of his bender
     
  5. Jul 18, 2013 at 7:53 AM
    #5
    Glueman

    Glueman Yersinia pestis

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    So you want the inside angles of the trapazoid you drew???
     
  6. Jul 18, 2013 at 7:55 AM
    #6
    TCprerunner

    TCprerunner [OP] Well-Known Member

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    Yes? I think. I wish I paid attention in school now..
     
  7. Jul 18, 2013 at 8:08 AM
    #7
    guitarjamman

    guitarjamman Well-Known Member

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  8. Jul 18, 2013 at 8:16 AM
    #8
    TCprerunner

    TCprerunner [OP] Well-Known Member

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    Thank you!
     
  9. Jul 18, 2013 at 8:21 AM
    #9
    Newby

    Newby Well-Known Member

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    Very good.
     
  10. Jul 19, 2013 at 10:48 AM
    #10
    Lumpskie

    Lumpskie Independent Thinker

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    Hey Guitarman, does your program take into account bend radius? I just did a quick calculation on a napkin and the 110 degree inner angle is a smaller angle than my quick geometry calculation.

    Here's what I did: (correct me if I went wrong!)

    Split the trapezoid into a rectangle and two right angle triangles (on either side). The base leg of the triangle is 11" (59-48), the hypotenuse is 16.

    To calculate the interior angle of the bend I set the sin of that angle equal to the opposite leg (11) over your hypotenuse (16). 11/16=.6875 so sin^-1 of .6875 equals 43.4 degrees. Finally I added that to the 90 interior angle of the rectangle coming up with 133.4 degrees.

    Looking at your 110 vs my 133, it would make sense to me that yours accounts for bend radius. How did you pick the radius to use?
     
  11. Jul 19, 2013 at 10:57 AM
    #11
    guitarjamman

    guitarjamman Well-Known Member

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    All looks well except for your base dimension, there are two triangles (one on each end) so you have to divide by 2:

    59"-48" = 11"
    11"/2 = 5.5"

    X =Sin ^-1 (5.5/16) = 110°

    My program doesn't account in for bending radii, I just assumed a 2" radius. These numbers are a little more precise than one could get bending a piece of 1-1/4" tubing so there should be no issues.
     
  12. Jul 19, 2013 at 11:32 AM
    #12
    Lumpskie

    Lumpskie Independent Thinker

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    DOH! (I am officially an idiot) Man, I knew something just didn't seem right. Thanks for setting me straight!
     
  13. Jul 19, 2013 at 12:49 PM
    #13
    Btnewman

    Btnewman Benjamin Newman

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    Thank god for prograns like solid works for stuff like that!
     
  14. Jul 19, 2013 at 12:51 PM
    #14
    Btnewman

    Btnewman Benjamin Newman

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    And in real life, those degrees get you really close, then real life sets in...
     
  15. Jul 19, 2013 at 2:09 PM
    #15
    TCprerunner

    TCprerunner [OP] Well-Known Member

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    Yeah I just needed close the bender can't be exact anyways thanks everyone for all the great help with your fancy math lol
     
  16. Jul 19, 2013 at 2:29 PM
    #16
    davidjmay

    davidjmay Well-Known Member

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    Just when I did all the math and figured it out....
     
  17. Jul 22, 2013 at 10:19 AM
    #17
    bmka87

    bmka87 Well-Known Member

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    good thing I decided to scroll down....almost did the math out on this one.
     
  18. Jul 22, 2013 at 10:30 AM
    #18
    guitarjamman

    guitarjamman Well-Known Member

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    Luckily the math isn't too intensive! I used AutoCAD and drafted it out in under a minute - double checked it with hand calculations. Can never be too sure and I sure as hell will NEVER 100% trust any answer the computer spits out.
     
  19. Jul 22, 2013 at 10:36 AM
    #19
    TCprerunner

    TCprerunner [OP] Well-Known Member

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    You guys are awesome lol I will get pictures wed. When all 3 are bent... I can't wait to get this on my truck and add my Jerry cans hi-lift and spare tire mount... That will all be empty till I have money lol
     
  20. Jul 22, 2013 at 10:44 AM
    #20
    Caduceus

    Caduceus Well-Known Member

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    Sadly, I looked at this and was like :annoyed:

    Even though I had college level (intro) calculus, and stats, and trig and crap, I stopped understanding math about the time we introduced letters. You know, like 7th grade.

    I firmly believe all the math I need to know for life stopped in 4th grade.
     
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