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Thread: Squaring a trailer frame - having problems

  1. #26
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    Re: Squaring a trailer frame - having problems

    Mixing concrete, and setting gateposts. Time for a break says me

    On the subject of squares vs. diagonal measurements vs. other means.

    A square will give you a very false reading if the steel isn't absolutely straight......from end to end, and everywhere in between. Just think how much an 1/8" bow in the center of your main rail would throw the square off. You'd be squaring in the corner, but squaring to the actual bow in the steel. Corners aren't reliable when dealing with long members.

    345 method is pretty much the same, it relies on a measurement over a small area in one corner. If the steel's not absolutely straight, you got error.

    The diagonal isn't perfect, but because you're measuring over a larger area, you're also compensating for some of the small errors in straightness of the steel. It sort of averages the thing out so to speak. It has some serious limits too.....if the distance is way too long it will show error in the droop of the tape etc. But all droops being about equal on the two measurements, you're still real close to what you want. If you're dealing with a long build it can be easier to mark off a small area in equal lengths (L & W) either square or rectangular, then square the smaller area using the diagonals.

    It's sort of a best effort thing. You try to get the most accurate representation you can get.

    But I go at most things sorta *** backwards anyhow
    "Any day above ground is a good day"

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  2. #27
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    Re: Squaring a trailer frame - having problems

    Bit of cherry pie, some tea, and the concrete mixer is fueled up and ready to go again
    "Any day above ground is a good day"

    http://www.farmersamm.com/

  3. #28
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    Re: Squaring a trailer frame - having problems

    Quote Originally Posted by Bistineau View Post
    If the corner to corner measurements are 136 3/4" each way, then what's the problem? It's as square as it needs to be. Not really gonna get any closer. So yes, Shoot the engineer and get on with production. While your at it, tell the perfectionist in you to go take a break and while you move forward with the build or your gonna do him like the engineer.
    Excellent advice for many builds whether in steel, wood, concrete, etc.....
    Dave J.

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  4. #29
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    Re: Squaring a trailer frame - having problems

    Water level base. Steel may be warped from tacking or cutting. Lay a full sheet of plywood on top for a square if you still don't find a happy medium.

  5. #30
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    Re: Squaring a trailer frame - having problems

    Why would you use a water level on a 5 x10 trailer frame? 24x24 I can see it. Just get something thats12 feet long and straight and level off it. Its a trailer not a paper machine base after all.

  6. #31
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    Re: Squaring a trailer frame - having problems

    Quote Originally Posted by M J D View Post
    Its a trailer not a paper machine base after all.
    Everybody uses a total station to build trailer.
    Donít pay any attention to me
    Iím just a hobbyist!

    Carl

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  7. #32
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    Re: Squaring a trailer frame - having problems

    I measure other people's trailers all the time checking for square. Nothing worse than a frame that's off by a couple thou..
    "The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore Roosevelt

  8. #33
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    Re: Squaring a trailer frame - having problems

    I mentioned water level because he said he was on a slanted driveway. So I would start with a perfectly flat starting point. Then I mentioned the plywood as a cheap huge square.

  9. #34
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    Re: Squaring a trailer frame - having problems

    Quote Originally Posted by blackbart View Post
    I mentioned water level because he said he was on a slanted driveway. So I would start with a perfectly flat starting point. Then I mentioned the plywood as a cheap huge square.
    It really doesn't matter if it is level or not, like Farmersamm pointed out, as long as it is flat it's good. Being level will not do anything to help with getting it square. Likewise it could be built on the most level surface you could ever hope for, and still be out of square. It could be built totally vertical and still be made square, so level has nothing to do with it. Once built, the trailer will most likely be out of level for most of it's existence from then on. But if correctly designed and built, it should still remain FLAT.
    He says it measures out at 136 12/16", so that tells me he has it square enough. Unlike Sandy above ^^, most of the population don't check trailers for PERFECT SQUARENESS. If it's square enough, then it's square enough to perform it's intended function. It could be made in an octagon shape with none of the 8 sides being the same length, and as long as the distance from the coupler to the axle on each end is the same, then the trailer should still track straight behind the tow vehicle.

  10. #35
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    Re: Squaring a trailer frame - having problems

    I guess he should scrap it and make the next one round.

  11. #36
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    Re: Squaring a trailer frame - having problems

    Quote Originally Posted by BD1 View Post
    I guess he should scrap it and make the next one round.
    Yeah, but then he would be more concerned with trying to make it PERFECTLY CIRCULAR . Probably tougher to do than square.

  12. #37
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    Re: Squaring a trailer frame - having problems

    I know the only thing I can make round is my waist line and even it is a little oblong !

  13. #38
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    Re: Squaring a trailer frame - having problems

    Bisteneau is correct, being flat is more important than level. Just don't use a level on any other part of the layout. Sometimes it's easier to work from a level base but not needed.

  14. #39
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    Re: Squaring a trailer frame - having problems

    Name:  image.jpg
Views: 189
Size:  55.0 KB
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

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  15. #40
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    Re: Squaring a trailer frame - having problems

    Quote Originally Posted by MinnesotaDave View Post
    Name:  image.jpg
Views: 189
Size:  55.0 KB
    Isn't that cubed?
    Gravel

    The difference between theory and practice is that in theory there is no difference.

  16. #41
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    Re: Squaring a trailer frame - having problems

    Quote Originally Posted by Gravel View Post
    Isn't that cubed?
    Cubed and then squared is a sixth power....I can't weld that
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Syncro 350
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  17. #42
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    Re: Squaring a trailer frame - having problems

    Quote Originally Posted by MinnesotaDave View Post
    Cubed and then squared is a sixth power....I can't weld that
    Rookie!
    Gravel

    The difference between theory and practice is that in theory there is no difference.

  18. #43
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    Re: Squaring a trailer frame - having problems

    Quote Originally Posted by Gravel View Post
    Rookie!
    After the 4th dimension, my ground gets tied in knots...
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Syncro 350
    Invertec v250-s
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    MM210
    Dialarc
    Tried being normal once, didn't take....I think it was a Tuesday.

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