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  1. #1
    looks nice, I'd just be a little concerned about how you are going to make the rails work on the gantry? That orientation is going to be very tricky to align within the required tolerances on a steel beam. What was your plan in that regard?

  2. #2
    Quote Originally Posted by Zeeflyboy View Post
    looks nice, I'd just be a little concerned about how you are going to make the rails work on the gantry? That orientation is going to be very tricky to align within the required tolerances on a steel beam. What was your plan in that regard?
    Dear Zeeflyboy,

    I hope for a miracle by epoxy

    First one needs a zero reference for horizontal level.

    I think it was Boyan who explained on the forum he made a reference level surface for this on a concrete floor by pouring epoxy.

    I will try this way.
    I will spirit level and anker bolt my frame to the concrete floor before pourings so nothing can move and use the x poured epoxy rail mounting surface for this.


    Pouring the rail mounting surface for X will be done like the example from a forum member see picture.


    like the X axis the 4 mounting surfaces on the gantry will be epoxy levelled.

    In 2 steps...

    Step 1 I will do the 2 gantry X rail carriage mounting surfaces, and bottom Y rail mounting surface pouring, in 1 go. ( gantry upside down )
    There will be an epoxy levelling bridge between the 2 carriage mounting surfaces
    Similar to x rail pouring setup


    So now those 3 surfaces will be in the same plain.

    After curing..

    Step 2 The gantry can now be flipped to normal position and top Y axis rail mounting surface can be poured..

    Placing the gantry in the normal position on the mounting surface of the x rail should give the best possible reference for a level plain.

    After pouring Y bottom and top should be in the same plain..

    In theory this should work.


    I know this will be a critical process.
    When this method fails i will redesign and have the gantry (rail) mounting surfaces milled. nothing much changes only a few pounds of steel added.


    When milling is needed i will upgrade the gantry box section to 80x120x8 or 10 to have some meat to mill
    I do want to avoid **bolting** the gantry sides to the gantry Y-axis.
    I prefer welded solid for best rigidity.
    But welding solid must be avoided going that route, because of warping.

    I have no friends with a mill capable of box section 1200X120x80.

    Would a surface grinder work for this purpose?

    Any other thoughts?




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  3. #3
    Thats how i did it on the gantry, my first build. gantry was flipped 180 degree and i poured gantry sides and lower beam epoxy. Then flipped and did upper rail. No problem.

    But you will need a straight edge and 2 precision squares for later when mounting the rails and so...
    project 1 , 2, Dust Shoe ...

  4. #4
    Quote Originally Posted by driftspin View Post
    Dear Zeeflyboy,

    I hope for a miracle by epoxy

    First one needs a zero reference for horizontal level.

    I think it was Boyan who explained on the forum he made a reference level surface for this on a concrete floor by pouring epoxy.

    I will try this way.
    I will spirit level and anker bolt my frame to the concrete floor before pourings so nothing can move and use the x poured epoxy rail mounting surface for this.


    Pouring the rail mounting surface for X will be done like the example from a forum member see picture.


    like the X axis the 4 mounting surfaces on the gantry will be epoxy levelled.

    In 2 steps...

    Step 1 I will do the 2 gantry X rail carriage mounting surfaces, and bottom Y rail mounting surface pouring, in 1 go. ( gantry upside down )
    There will be an epoxy levelling bridge between the 2 carriage mounting surfaces
    Similar to x rail pouring setup


    So now those 3 surfaces will be in the same plain.

    After curing..

    Step 2 The gantry can now be flipped to normal position and top Y axis rail mounting surface can be poured..

    Placing the gantry in the normal position on the mounting surface of the x rail should give the best possible reference for a level plain.

    After pouring Y bottom and top should be in the same plain..

    In theory this should work.


    I know this will be a critical process.
    When this method fails i will redesign and have the gantry (rail) mounting surfaces milled. nothing much changes only a few pounds of steel added.


    When milling is needed i will upgrade the gantry box section to 80x120x8 or 10 to have some meat to mill
    I do want to avoid **bolting** the gantry sides to the gantry Y-axis.
    I prefer welded solid for best rigidity.
    But welding solid must be avoided going that route, because of warping.

    I have no friends with a mill capable of box section 1200X120x80.

    Would a surface grinder work for this purpose?

    Any other thoughts?
    Sounds good! Will watch with interest. Good luck!
    Last edited by Zeeflyboy; 14-08-2017 at 12:33 PM.

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