big budget cnc

[Davek0974]

what do you think or what should i change

Your issue is going to be that massive 3m gantry beam - even at 160x80x5 it will flex and twist like a bitch.

Then there is weight - that beam will weigh about 55kg before adding motors, spindle, guides, motion etc - two nema23's will not do unless you add some decent gear/belt reduction - this will be a slow machine, this size stuff is servo motor territory i feel.

To stop the beam sagging, you add triangulation - a support from end to end raised in the middle and joined with a strut, this will not stop twist though and all this will add weight, I would guess a working 3m beam gantry would weigh in at around 200kg or more - this is silly and would mean using Aluminium to build it.

I'm not bragging on you here - just trying to save your money, i've built some dodgy small machines in the past but nothing this big ;)