Squaring a gantry - without a square?


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Thread: Squaring a gantry - without a square?

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    Default Squaring a gantry - without a square?

    There must be a more accurate way to square a gantry then just using a carpenters square and a dial gauge. Anyone with good math intuition have ideas?

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    Cut some square blocks and measure the diagonals.
    Or, line them up against a straight edge, and check if the edges are aligned. Flip one over and see if it's still aligned.

    Gerry

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    String from the middle of the opposite corners of the gantry to the rails

    I would check it from both ends.

    (An illustration for measuring a fence)

    Also, the 2-4-5 method. A triangle with the sides length 3, 4, and 5 will be a right angle.

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    I've got one of those 2 foot long painted steel carpenters squares, the cheap ones from the hardware store. It is surprisingly good, as good as my engineers squares! I think the big die they used to punch it out was cut on an expensive machine.

    And then I use Ger21's method, cut 2 squares as large as possible and flip one over.



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Squaring a gantry - without a square?

Squaring a gantry - without a square?