Initial design advise wanted

[fifa]

It is your design, your money.

5m/min with 10mm pitch is 500rpm.

It is better to choose 2020 screw...

I do not understand why you need "rapid" speed. It is hobby machine, and it is CNC. You do not need to be with machine to do the work...

It is relative very easy to "limit" the spindle "wobbling" - 2 nylon bushes do the job (bushes must be splitted axially and loaded with spring to omit radial clearance...

Check the motor torque curve - steppers are not good at high speeds, therefore belt pulley reduction does not work....

For whatever reason link do not works. I am suggesting to do the "bed" form cheap "cast" (epoxy concrete - cheaper than welded structure), gantry must be designed to be torsional stiff, however it is better that laterally it is flexible - to reduce loads caused by rail misalignment...

regards

martin