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  1. #1

    Join Date
    Oct 2021
    Posts
    2

    Concrete with 8020

    Hello all, I am slowly building a CNC Mill about 12x10x5" in size. I would like to use aluminum extrusions as they offer me the most flexibility because I intend to modify the build as I go, and change out linear rails, spindle, and ball screws later. I want more rigidity though so I would like to fill the frame with concrete where I can. I don't want o fork over the money for epoxy/sand/granite that's why I'd like to use concrete. Problem is that concrete reacts with aluminum, so I was wondering if anyone has tried coating their extrusions in clearcoat spray, thin epoxy layer, or something else to protect the concrete from the extrusions? Here's the rough sketch I have, but I am working on a more professional drawing as I get in parts and measure them correctly.

    The blue is concrete and the gray is aluminum, I used 4" PVC pipe as a filler to reduce the concrete needed without reducing damping/strength much.
    Attached Thumbnails Attached Thumbnails ortho.jpg  

  2. #2
    Registered
    Join Date
    Jan 2008
    Posts
    1295

    Re: Concrete with 8020

    You show unsupported round linear rails. Very floppy.

    Fix that before thinking about concrete fills etc.

    Sent from my SM-G970F using Tapatalk
    7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)

  3. #3

    Join Date
    Oct 2021
    Posts
    2

    Re: Concrete with 8020

    Quote Originally Posted by pippin88 View Post
    You show unsupported round linear rails. Very floppy.

    Fix that before thinking about concrete fills etc.

    Sent from my SM-G970F using Tapatalk
    Already fixed that, I have linear rail in hand now. that's just a layout drawing. The most important thing for any machine is a strong foundation. It makes no sense to spend hundreds on linear rails if they are bolted to something sloppy. That's why I'd like to see what can be done with concrete.

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