Hercules... get that from flying Hercs C-130ís. Cnc is my hobby. Been in it about 5 months. I have a Shark HD4 ext and run Aspire on it. Starting to learn Fusion 360. I like them both. I am installing a water cooled spindle now. I got one off Amazon (fly Amazon Prime cargo...). I got it set up and the spindle was boiling within a minute and the inverter was erroring with an overheat. Found THEIR settings were at 220 when it is a 110 spindle. Changed it to 110 and so far so good.