DIY CONCRETE CNC

[XYZ_Spec]

Oh no, there was nothing wrong with what you wrote ehehh
I meant that my build is so far from his, in all ways. He built a perfect machine in my opinion.

I did this with structural concrete (the one used on bridges).
It comes pre-mixed and it's under 5$ for a 25kg bag.
Yes, I machined and built a wood box around it and inserted steel for all the mounting points.
It also has a steel frame inside it to prevent fractures.

One day I want to do a build step by step, but it will take too much time... But free time is something I don't have a lot these days...

Thanks

[XYZ_Spec]

[XYZ_Spec]

2 short videos and some pics. It's done.

https://youtube.com/shorts/wP7L-6XJUj4
https://youtube.com/shorts/QMxYvwHkdTA

[ardenum2]

y axis motor mounts(on the side walls) are cast-in right? I like that.

[XYZ_Spec]

y axis motor mounts(on the side walls) are cast-in right? I like that.

Yes they are.

[XYZ_Spec]

Hi

[XYZ_Spec]

UCCNC Macro in action

https://youtube.com/shorts/G5BC9XSJGYI?feature=share3

[rajhlinux]

Hi all,
This is my small build.
Base is made of structural concrete and the rest is just some steel box tubing for the gantry and some 20mm aluminum brackets and plates.
Nema23 3nm closed loop steppers, ballscrews etc...
Work in progress.

You can see it cutting in my YouTube channel.

Impressive, what kind of accuracy are you getting?
Also, have you put any cement in the gantry's steel box tubing?

What type of structural cement did you use?

Can I use non-shrink precision grout such at the following for making the base and gantry?:
https://www.sakrete.com/product/prec...ruction-grout/

Thanks.

[rajhlinux]

I meant no disrespect Just stating what was said earlier...
In all fairness I had no idea who this Piotr was but soon learned about the machine he made...
My apologies if there was something offensive made...
Could you kind of let us know where you got the theory from on this build?
Could you describe a bit more on the foundation? is this complete concrete, rebar of some sort, or is there metal inlayed inside the concrete for the components attached?
As I stated earlier, I'm in the design process and always looking for a better game plan if its within my realm of fabrication...
Inquiring minds would like to know...
Thanks
Paul

He meant that Piotr's build is much more complex and advanced than his CNC. Piotr is using solid natural granite, it's the premium standard for making high precision CNCs. It does not shrink and is extremely stable and rigid. His base is literally a granite surface plate. The columns he flatten himself. Granite is expensive compared to concrete.

I'm interested in using concrete to gain experience in building CNCs before jumping into using granite. The videos demonstrated here proves that concrete is good for making a CNC, I'm just worried about it shrinking.

[rajhlinux]

Oh no, there was nothing wrong with what you wrote ehehh
I meant that my build is so far from his, in all ways. He built a perfect machine in my opinion.

I did this with structural concrete (the one used on bridges).
It comes pre-mixed and it's under 5$ for a 25kg bag.
Yes, I machined and built a wood box around it and inserted steel for all the mounting points.
It also has a steel frame inside it to prevent fractures.

One day I want to do a build step by step, but it will take too much time... But free time is something I don't have a lot these days...

Thanks

Please make a step-by-step video, I'm interested to build.

[XYZ_Spec]

Hi, not having much free time. Will do a video about the machine as soon as possible.
Thanks

[harryn]

Very nice - thank you for the videos and photos.

Plenty of info on how to construct it on there.

Harry

[XYZ_Spec]

Very nice - thank you for the videos and photos.

Plenty of info on how to construct it on there.

Harry

Thanks!