big budget cnc

[pet30]

Hello

I am peter 30 from belguim.
first of all sorry about the bad english i don't typ it a lot.

I am thinking of building a cnc and i hope you can help me with the design.

The idea i have is a machine of about 3000x 1600.
Why this big ? because i have a small company and i make kitchens ,dressings,TV cabinets etc.
this way i can lay down a sheet of MDF of melamine and cut the pieces .

But the thing thats special about the machine is the next thing:
i want the gantry to be 3000 mm, so basicly a big gantry and smaller X axes then normal.
i was thinking for the gantry 160 mm high and 80 mm deep.
is this enough or do i need to make it bigger so it do's not flex?

Instead of linaire rails i was thinking a strip of steel or alu and then ball bearing rolling on the alu or steel rail.
the reason why is simple.
I want to start with a budget machine and later in the future upgrade it with better linaire rails like hiwin etc but for know i don't have the money to spend on expensive linaire rails.
for now i will use a bosch router but also in the future a spindle.

For the drive i was thinking rack&pinion module 1 is this enough or do i need to use 1.5 or 2?
the motors and R&P will be mounted on the rails on top.

i was thinking to use these motors.
Nema 23 stepping motor 57BYGH627

is this strong enough or not?


i made some drawings in sketchup.

Sorry for the many questions but i just want to be sure before i start building.