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IndustryArena Forum > MetalWorking Machines > CNC "do-it-yourself" > DIY Fibre Concrete 40x30 CNC Mill
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  1. #1
    Join Date
    Nov 2020
    Posts
    5

    DIY Fibre Concrete 40x30 CNC Mill

    Dear CNCzoners,

    below the link to my brand new video showing the highlights of the fibre concrete CNC built. I thought long about what materials best to use with the tools that I had at hand. I decided to experiment with fibre concrete. I am quite satisfied with the result. Enjoy the video!

    https://www.youtube.com/watch?v=3JwQ6bVTlHI

    Cheers

    TheTinkerLab

  2. #2
    Join Date
    Mar 2012
    Posts
    34

    Re: DIY Fibre Concrete 40x30 CNC Mill

    Very nice build Any plans of replacing wood parts with aluminium ?

    This is regular concrete with rebars

    Sent fra min SM-G975F via Tapatalk

  3. #3
    Join Date
    Nov 2020
    Posts
    5

    Re: DIY Fibre Concrete 40x30 CNC Mill

    Quote Originally Posted by xillianto View Post
    Very nice build Any plans of replacing wood parts with aluminium ?

    This is regular concrete with rebars

    Sent fra min SM-G975F via Tapatalk
    Hi xillanto, yes I ordered aluminum for the z-axis. Especially the mount for the Spindle is not rigid enough on wood (like a spring). I tried milling steel and see marks on the surface that probably result from that. This should stop with the alu z-axis.

    I like your tub design! Would be perfect for flood cooling - is it sealed? Are you happy with your automatic toolchange spindle? I already had an eye on that one...

  4. #4
    Join Date
    Mar 2012
    Posts
    34

    Re: DIY Fibre Concrete 40x30 CNC Mill

    it's set up for flood cooling for sure

    And yes, i am quite happy with the spindle, it's 3kw 4 poled so it has allot more torque than regular spindles.

    I have tried steel aswell, and that wasnt any problem at all

    As you can see, it can manage quite good cuts, that was 12600 rpm, 2700 mm/min, 10mm deep and 3.5mm width of cut, and it still didnt struggle.

    I have not built enclosure yet, but using some curtains for shower at the momemt, and it works quite good

    The machine keeps surpricing me every day

    Sent fra min SM-G975F via Tapatalk

  5. #5
    Join Date
    Jul 2020
    Posts
    32

    Re: DIY Fibre Concrete 40x30 CNC Mill

    Quote Originally Posted by xillianto View Post
    Very nice build Any plans of replacing wood parts with aluminium ?

    This is regular concrete with rebars

    Sent fra min SM-G975F via Tapatalk
    Interesting, I want to build a 4 ft x 7 ft CNC router for 3D carving wood, like making chairs, tables and doors which has 3D carvings.

    From my understanding to have fine 3D carving details one would need a CNC router which can hold an accuracy and repeatability of 50-120 microns at least.

    Can ultra high performance concrete provide this level of accuracy and repeatability?
    I have seen many people using UHPC for making precision CNCs, how much better is UHPC over epoxy granite? Everyone seems to state EG is better for accuracy in the long run.

    I think I would need to use a rack and pinion rather than ballscrews.
    Rack and pinion quality nowadays is just on par with ballscrews, many commercial large CNC routers today uses rack and pinion.

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