need help! choosing right kit

[JAZZCNC]

Ok well it,s been said but will say again to backup. Forget Single screw down centre gantry will twist at this width. Forget 25mm screws unless running nema34 with high voltage AC drives.

Now the sqrt(3.8 mh) * 32 is just a guide and in practice you can go higher without any issues or shortening motor life too considerably. (One thing to note because your in a Hot country I would consider putting cooling fans on the motors, PC CPU fans work well)

The PSU you linked too would work ok but first I would look into making your own.?
It's very easy all you need is toroidal transformer, 1 x brdige rectifier and capacitor/s. Obviously these need to be sized to give the output your require which we can help with.
You must have electrical component suppliers like RS components in your country so I would enquire about costs because Unregulated toroidal PSU is much better for CNC when your running near the drives Max voltage.

So Definately go with 2 x 3nm/1610 running 70V. Will warn thou that at 1750mm length with 16mm screws your at the point when whip at higher feeds can cause problems so you may still need to limit motor tuning to lower rapid speeds.?
Also the mounting and alignment will need to be perfect, which it should be anyway, but if your off just a little then this is amplified at this length which can introduce whip and resonance.!

So hopefully now you see why WE all have been asking you to slow down and think about it becasue so many things affect other parts of the machine and for good machine you need balance and components working in harmoney not fighting each other.!! . . . . In CNC we Make LOVE(chips) not WAR. .Lol