Linear rail question

[Nr1madman]

All good feedback! Been thinking alot and got a good contact for z-plate milling, so thats coming along ;)

New thinking and new problems!
Im going with welded steel frame, around 60x60x3mm for x rails and legs.
Now for the question.
Can I use something like 40x40x2 or even 30mm for bracing?
What measure should I use for the bed? The total size should be 1500x1500mm (maybe smaller in y, total 1000mm but I would love the posibilities of 1200 workable area)
Im thinking of making a frame and then crosssections along y axis only about every 300mm? Maybe with 40x40x2mm steel?
And then one under all of then in the x axis in the middle for sag support?

Would love to show a cad drawing here but my computer died and Im restricted to using a phone at the moment.

Regards
Madman

[JAZZCNC]

Get your PC working and show Pic of what your meaning because without it not easy to visualise and could easily be talking at cross purposes.

Also at that size then I'd go with 5mm wall not 3mm. This will give enough material for drilling and tapping but more importantly help lower resonance from thicker wall. The difference 2mm makes is quite noticable on resonance.

Smaller tube size for bracing is fine provided there's enough of it and bracing in the right places. I'd go with 40x40x3