Question Power supply for my DIY CNC/Scara device ?

[NwBstPlyr]

So we're trying to come up with our own CNC device. We want to use these components:

• 3 x Nema 23 stepper motors (3V, 3A)
• 1 x Nema 17 stepper motor (3.6V, 1.2A)
• 4 x TB6600 driver controllers (takes in 9-42VDC, outputs 4A peak)
• Limit Switches
• Raspberry Pi 4
• other components down the line

I want to know what kind of power supply would I need to power these devices smoothly?
Can I use one for all of them or separate the raspberry pi's power supply with its own one?

 

[Eximo]

Frankly, this should be the easy part.

Looks like you are going to want a 5V supply at around 65 watts for some margin. This could be a typical phone charger power supply, and you could easily pick up a 120W or bigger for some additional margin. Then you are going to need some DC-DC converters to get you down to 3V and 3.6V, or you can just go with some simple voltage regulators with beefy heatsinks on them.

10W DC-DC 3.6~40V to 3.3V 5V 12V 2A Buck Step-down Converter Voltage Regulator | eBay

Output Current: 2A (Max). We afford all cost if it's our fault. or Negative.

www.ebay.com

XL4015 AC/DC to DC Buck Step Down Volt Converter 3.3V 5V 12V 24V 4.5A Regulator | eBay

The power module adopts XL4015 with external heat sink, which can withstand high current operation. The input end adopts 8A rectifier bridge stack to input AC power, the power inductor is sendust 10A coil, and has a dedicated DC input port, which is generally used for AC and DC input.

www.ebay.com

The 4 main motors on the other hand need a lot more voltage and power. Quite a few options here. You would probably want something like an 800-1000W 36-40V supply.

Which is apparently a fairly common request, they even mention your use case:

AC to DC 800W 12V/24V/36V/48V Switching Power Supply for 3D Printer CNC Motor | eBay

Rated power: 800w. Universal AC input, selected by switch;. Cooling: forced wind. 100% full load aging test, CE/FCC complaints;. Drive mode: constant pressure.

www.ebay.com

Not a strict recommendation on all these ebay parts, you should shop around and see if you can find a quality unit from reputable manufacturers depending on your budget.