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  1. #1
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    Join Date
    Jun 2019
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    12

    Fixed Gantry Mill

    For a while, I have been looking at building a new milling machine.

    This is the design I came up with. The machine will be primarily for aluminum and maybe some mild steel. The base will be cast out of concrete within the frame.
    I will be running flood cooling, so there are also 3 x 100mm drains in the base which will run into a catch tank under the table. This will also be for chip collection.
    The cutting area will be 750 Y, 900 X, 250 Z

    50 x 50 x 5mm square tubing filled with concrete for the frame.
    50 x 5mm angle for all the rail mounts with nuts welded under for more thread strength.
    HGR20 Linear rails and bearings
    1500mm Y, 1000mm X, 500mm Z
    Sika Shrink compensated cement for the concrete mix for the base with 4 layers of 10 x 50mm grid reinforcing mesh
    (this is for weight and volume to reduce vibrations and increase rigidity)
    Nema 23 3nm motors with 24tooth 15mm HTD belt pulley on all the axis
    1605 Ballscrews with 60tooth 15mm HTD belt pulley on all the axis

    Today I got the frame weld up. Hoping to have all the plugs and hardpoints done in the next 2 weeks.
    Then will be on to the casting. It will be left to cure for about 40 - 60 days. In that time I will be building the mold for the gantry.

  2. #2
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    Dec 2003
    Posts
    979

    Re: Fixed Gantry Mill

    The gantry looks super solid and the table seems to be substantial.which makes it puzzling that the Z axis features a comparatively skinny backplate attached to the spindle by a solitary mounting bracket at one end.It looks like a much weaker link in an otherwise solid machine.It may help you to create a model of the spindle with a tool in place and to see what kind of limitations the geometry will lead to regarding machining in corners and by the side of vertical walls.

  3. #3
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    Jun 2019
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    12

    Re: Fixed Gantry Mill

    All the Z axis Plates are 200mm x 20mm thick Aluminum.

    1> Do you think adding a second bracket to the spindle will help?
    2> Will boxing the spindle will 5mm steel plate give a significant improvement?

  4. #4
    Member
    Join Date
    Jan 2005
    Posts
    12860

    Re: Fixed Gantry Mill

    Quote Originally Posted by Saintgp View Post
    All the Z axis Plates are 200mm x 20mm thick Aluminum.

    1> Do you think adding a second bracket to the spindle will help?
    2> Will boxing the spindle will 5mm steel plate give a significant improvement?
    2 Mounts are always a good idea
    Mactec54

  5. #5
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    Join Date
    Nov 2020
    Posts
    210

    Re: Fixed Gantry Mill

    I wouldn't worry too much about the z axis, the way you designed it is cheap so you can always make it better once the frame is cast.

  6. #6
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    Dec 2003
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    979

    Re: Fixed Gantry Mill

    The additional bracing in post #3 would definitely stiffen things but it would also add protrusions that limit how close you will be able to get to projecting parts of the workpiece.The second spindle mount will go a long way to eliminating the potential problem

  7. #7
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    Join Date
    Jun 2019
    Posts
    12

    Re: Fixed Gantry Mill

    I have been busy at work, so the progress on the machine is slow. I did manage to get the Y-axis rails and ball screws on. I also made some room for NEMA 34 motors just in case I am not happy with the NEMA 23.

    I fitted a NEMA 34 closed-loop motor with and made a small test jig, using an Arduino Mega with GRBL and UGS.

  8. #8
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    Join Date
    Jun 2019
    Posts
    12

    Re: Fixed Gantry Mill

    I plan on using a 32" touch screen, mounted in portrait, and will be running Mach3.

    I was looking into the Pokeys57CNC for a controller. Good or Not?

    Also is there any Mach3 Screen Set in 1080 x 1920 resolution?

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