[Piotrsko]

Making something like this that's accurate to .001 isn't hard, you just need a solid tool holder and some really light feed pressure and oddly: climate control or a way to keep the part uniformly cool or warm. Rinse repeat. Making a part repeatable to .001 or making it that accurate to start with: THAT'S difficult because you need to also build a system that measures more accurately than you can cut. Light powered optical measurements are good to .0001 or 1 ten thousanths but it's only accurate to how accurate the profile is. If they found a couple of these that are that accurate, now I'm impressed, but a one off cherry picked for youtoob..... not so much.

I am also contemplating the visuals this guy is pushing with his measurement equipment, like how come the dial indicator foot isn't on the visible side where you can see it touch? I am also suspicious of his position locator arm sitting in a room temprature not clean room.