Suitable stepper motor drivers for my creation

[chillybo]

Thanks Lee, I think the mistake I made with the power supply voltage is that I calculated the stepper motors 'sweet spot voltage' from the one with the lowest inductance thats going to be powered by the supply ( 3mH whereas the two Nema 34's are 3.4mH). I suppose it's now a case of seeing what the performance turns out like and if need be build a separate supply for X and Y.
The gantry will be lowered and the excess extrusion will be cut off to help with weight of the gantry. Ive built it like this so I can work out the best height by actually using the machine when its ready to cut.
I can tension the belt by lowering the stepper motor as it is adjustable. I will be building some kind of springy tensioner though.
I will keep an eye on those shaft couplings and maybe swap them for the Oldham type ones or even switch to using belts.
Im building it in the kitchen dining area at the moment and have to put up with the wife grumbling about it. Its being used mostly as a clothes horse at the moment to justify it being in the house instead of the garage .