All steel, no welding, 2000x1300x250mm

[eurikain]

i don't want to discourage you but as i have some experience doing similar assemblies from laser cut parts:

No worries, you are not discouraging me at all ! I appreciate very much the effort you put in giving me advice, and I am willing 100% to listen to you !

-going from square to round rails is a very bad idea at that point. Why waste effort and money then to make all that rigid structure.

Yes, I've decided to go round rails, no doubts. My next build with higher budget will get those HIWIN stuff.

If you go with round rails then make a simpler square profile structure, no need to make that laser cut monster

What do you mean ? I don't picture it very well :/

- BST automation at aliexpress , Fred is a very good seller, he could do all that stuff, machining screws, send 3m well packed ball screws, lower value, etc. tell him Boyan sends you, he gives me best prices compared to ebay and aliexpress, furthermore you could order all from him, including VFD ans spindle, he has more than he lists, just email him, no problem with errors or warranties

Right, I've seen you guys all buy from him. I'll note that and make sure I order from him next time. I won't forget to tell him it's from you so I can get best prices. It's nice of you to share !

-the way you fix your motor and ball screw, that moves the Z left right, take care to be able to adjust that

Okay, I'll make slots for the motor holes. I have more room on the Y axis. Z is a bit tighter so not sure I can have big slots there.

-as i made some similar stuff i am telling you you will need at least 12 heavy duty clamps to be able to straighten all and solder. plus a big plastic hammer at least, i would say you will need a press. see what i did here for the Z #155 and imagine at your scale of things how difficult that will be in reality if plate is not straight after cutting

Sounds good. But, what kind of clamps are you talking about ? Can you give me an example ? Maybe I can ask the cutter to surface the steel ? I'll give them a call tomorrow and ask what they can do to minimize the distortion effect due to heat. Water jet cutting would probably solve this issue. Post-heating / pressing the plates as well (?). But as you said, a good rubber hammer and clamps will do it with enough patience.