A portable milling machine with a ... The design includes a milling head that can be rotated 360°, and electric feeds that can be mounted on the X, Y or Z axis. The machines have a heavy-duty spindle ...

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.