A simple ATX computer switching power supply isn’t going to cut it for this machine unless I buy new 12 volt Stepper motors. So my idea is simple. The circuit will have two LM317 to control the 12volt and 24volt outputs. Also it will have a LM7805 to power the Arduino. A 30volt Transformer rated at 3 amps with nothing other then a rectifier from Diodes and a couple of caps.
The Arduino should handle the rest for PWM and speed control for the spindle that is running on the 12volt rail. The 24 volt rail will be used for the steppers. I’m trying my best not to Heath Robinson this project.