No formal training, mostly self taught.
Mech Eng degree, worked for a few biggish engineering companies as production manager before joining up with a mate and starting a precision machining company. Initially prototype parts for the moulding industry, manual m/c work, but fairly quickly moved towards small batch stuff. Bought a CNC lathe, then another, then some CNC mills and pushed all the manual stuff into the corner, batch size 10 - 200 pieces sometimes 1000. Partner sadly died along the way but I carried on. Best thing I ever did was buy a Star sliding headstock CNC lathe, astonishing accuracy, turning to 8 microns tolerance! Expensive, but paid for itself very quickly, so bought another one, 9 axis working!
Ended up with 7 CNC lathes and 3 vertical machine centres, plus other usual workshop stuff.
Used to run the Stars unmanned through the night - lights off, lock up and go. Set up a WiFi camera in the workshop to check up on them at 2.00AM to see if they were earning their keep. They had fire suppression fitted, just in case, as they were running on neat oil and sometimes got a bit warm!