Help needed proofing newbie control schematic.

[AndyUK]

Hi m_c.

Will this work?

RayCNC electrics Master - Copy.pdf

Looks like you've removed the fuse from the spindle AC input, and there is no separate fuse to the 24V PSU?

This means that the fuse in your mains plug is now covering both devices... Which means they wouldn't trip as fast as they should. Imagine if your PSU had a fault, instead of a ~4A fuse it now has a 13A fuse...

Order should be: Mains -> Plug -> Fuse in Plug -> On Off Switch -> EStop (I have my reservations about this but you seem to want to do it without a safety relay...) -> Mains Distribution -> Individual Device Fuses -> Individual Devices.

Why are you using an Arduino UNO rather than a dedicated CNC controller? If it's a cost thing, I bought a MKS DLC32 from AliExpress then other day for £15 delivered.... It runs FluidNC beautifully, and I can guarantee it'll outperform that Uno. It has dedicated motor drive outputs for 4 or 5 axis, a spindle control circuit, an Estop circuit, probe and limit switch pinouts... Oh and onboard Bluetooth and WiFi, with a web server for on the fly config and control. The 3D printer revolution has made lots of cheaper end items available.