CNC machine B64-S-ATC

I've started a new project, this time a CNC machine. I did a little design review video. I want to try to make a machine with auto tool change. Setting up the ATC will probably be the hardest part of this project for me. So get ready, I will ask nub questions)

Hmm, that's a fresh thought. I hadn't thought of using the electronics box as one big stiffener. Of course, it would be difficult to make the welded base itself quite accurately so that the box would fit with minimal gaps. But I'll definitely give it some thought, thanks.

Got all the profiles and cut to size. Some of them are quite massive in real life, it doesn't feel that way on the 3d model. 




Started processing the profiles:

 

It's not moving as fast as I'd like, but I'm glad something is done already.

 

Some progress here. I continued making the base and found out that the profiles with t-slot are slightly larger. Since they fit one to the other and there are 10 of them, this error will not allow to assemble everything.



So I had to fix it. 




Finished all the profiles and parts for the base. 



Now for the fun part. I've been wanting to try using profile filler for a long time and now I've finally made up my mind. I decided to use epoxy granite, it's easy to make and adds quite a bit of stiffness and most importantly, dampens vibrations very well. I made some samples to check the composition of the mix, everything went well with the calculation.  



Then I decided that it would be easy to put the tabs in the profile with an internal cross-section of 70*30mm. But it turned out to be very difficult, don't do it like that. 




Laying the mixture inside and tamping it down through all those tabs wasn't easy either. Now while the epoxy granite is gaining its strength I can do the other parts.

 

Now it's time for the portal beam. I milled seats for the rails (the profile itself was bent by about 0.2mm) and drilled all the holes. 



I also decided to fill this profile with polymer granite.
Remembering not very successful variant with tabs in the base this time I decided to try a different way. I cut all the threads directly into the profile and then screwed the screws in. Then I poured the polymer granite and after a few hours, when the mixture began to harden, I carefully unscrewed it all. It was much quicker and easier than with tabs.

There will be a motor on one side, so the fill will not be full volume. I also decided to put the wires from the motor through the profile, so I used a cardboard tube for this. On one side it is held by an aluminum plate. When pouring the polymer granite to have support inside, I made a piece of thin MDF.

 
 
 

Moving forward a bit, this time the Z-axis. 
The profile turned out to be bent, I had to level the plane for the rails.

 

When machining, some of the clearances were very tight.

 
 

But it went well, plus another part ready to go.