PSU size calculation

[ian]

Hi Jazz CNC

I've have build a first version as a proof of concept (see picture attached), but am now starting a new "better" build and am looking at what the ideal PSU should be so that I can buy the right one (or multiples if needed).

The aim is to build a bench-top CNC router, able to cut a lot of engineering plastics of up to 600mm x 600mm x 40mm with reliable precision and accuracy of 0.01mm at the most optimale speed (which seems to be 3500mm/min+) and at 3200 resolution. The machine will be used to make prototype enclosures for GPS trackers for cattle and sheep and accuracy is important due to the products requirements and to achieve good surface finishes and potentially also cut PCB's. Ideally the machine will be housed in a sound/dust enclosure as it will be in my office and I will need easy access to it to build prototypes and keep an eye on small production batches, making 100's off enclosures weekly, so the machine will operate ±4 hours per day and must be reliable. I will also cut some aluminium plates for making prototype moulds.

I'm not yet sure how achievable and realistic the above is as the budget is also somewhat limited, but I intend to build incrementally from the basics (solid frame and linear motion) and add more automation and features later on (assuming I can define a good end-design in the beginning and build towards it).

So far I have the following items for my next iteration:

X & Y
3 x 800mm 1605 ballscrews, C7
3 x pairs 800mm Hiwin 15mm rails and 2 HGR15CA carriages per rail

Z
1 x 250mm 1605 ballscrews, C7
1 x pairs 300mm Hiwin 15mm rails and 2 HGR15CA carriages per rail

4 x Nema 23 motors, 4Nm (want to change to closed loop steppers and drivers as step errors can ruin expensive components)

40mmx80mm extrusions for the frame (need to change these as they are not rigid enough)

Blackbox controller (from Openbuilds), 24v power supply, limit switches (ALL of this needs replacement with better components - these were only for my proof of concept machine build)

I'm currently working on the designs for the plates which is likely to be 15mm aluminium.

What would the ideal PSU specs be for such a machine and the closed loop motors?