Thanks. I am starting to realize this.

Let me explain something.

This build is a rip-off of my design for my next build which is meant to ride on 34 name Rack and Pinion.

I spend quite some time asking people around when i designed it, so it seems the overall opinion was that a 150kg gantry is quite well driven by 34 nema rack and pinion, i mean the acceleration and deceleration. There were even people on CNCzone that insisted that the gantry behaves well if is loaded more than 130kg so they made it heavy on purpose.

So everything started as i would like to test the RP on a real build, The nema 34 would raise the price, so i went for Nema 23 and started slowly underrating my original idea.
Now Just received an answer from CNCrouterparts and Ahron tells me what i suspected , that the g540 is not up to the task and i should couple their low inductance motors with better drivers, due to possible g540 overheating during long runs.

So it seems i am insisting on the RP drives . I like to test them and could not help . I am at the point of ordering the RP drives , racks and the low inductance Nema 23 . That means i must lower the gantry weight.

Ok, gantry weight.
Lets see. I can go back to 50 kg, complete gantry with Z, still keeping some reinforcement. Only eventual twisting should be considered, z is 300mm wide so no worry there in the other directions. Another point is that normally the jobs will be done with rough cuts by 1/4 router bits and fine passes 1/8 router bits, with passes equal to the width, routing wood as i said and that easy going special cast materials which route like MDB , so this is not a factor that would play in the final design.

Jazzcnc, i highly value your opinion. Why you believe the Chinese ball screws 2010 for example could give me better finish than the RP drives? All seem to be happy running RP drives, did i miss something? I know the table is not so big to really need RP.