you probably have run across [UsagiElectric] aka [David]’s various PCBs that he makes on his own Bridgeport EZ-Track 3-axis milling machine — massively oversized for the job, as he puts it.
With a lathe, we are told, all other machine tools can be built, including a milling machine ... motor is from a paint sprayer and the Z-axis power feed is a treadmill incline motor.