Stell frame cnc 1500X1000. Adjustable table your opinion please

[Boyan Silyavski]

Nice. Looks great,

What size of the steel profile you decided on? If 80mm or bigger, you don't need the triangular plates. Believe me, will not move. Reason - the short profiles will hold it firm enough. If you insist, make them L shaped, so they will not bother you fitting longer than the table pieces.

And as for the size of profile, i am with Jonathan. Bigger the profile, the better. If resonance, its easier to drill a hole and fill it with something later.

I said it earlier some where but one of the best ways to fight resonance is avoiding perfect symmetry in the machine, meaning all pieces spaced same distance and mirrored exactly. Offsetting each piece even by 1cm here and there will have enormous impact. Same when avoiding mirroring

[ba99297]

Nice. Looks great,

What size of the steel profile you decided on?

At the above plans i use 80X80X5 beam for the red table and also for grey frame except the 4 lower beams that will have contact with the bench. Those four beams are 100X100X4. I think that the triangular pieces will help to achieve triangulation and parallelism and also stiffness.
I agree with you that if avoid symmetry and mirroring that will help to reduce resonance. As for the beam size i think even 80X80 or 100X100 will not have much difference to the final result.
The t-slot profiles are aluminium profiles that are used for for clamping solar panels at the roofs. I design the profile from a piece that i had.
I will come back with the gantry design. I will use one motor for X axis with double ballscrews and i may use double nut (preloaded with a spring) for each side
I want you opinion about this option. What kind o f spring is suitable for this use and where can I find it. I also would like to know what would be a good distance between Y and Z axis profiled rails ( i will use 20mm profiled rails ). Also what will be a good distance between the carriages of X axis ( outer side of carriages )

So far thanks everybody for the help

Vagelis