A high-speed spindle is added to a DIY PM25 CNC mill and changes made to the LinuxCNC Fusion360 post processor to automatically switch between the secondary and primary spindles using request spindle speed. The two spindles, working together increases the capabilities of the machine while re-using all the motion hardware. The high-speed spindle is 2.2kW 24kRPM and the main spindle 0.75kW 5.5kRPM. Installation and cutting first part is shown. The VFD used is a Fuling. The audio of the second runout test was dropped. I can live with 2 tenths of runout.