Machining a giant ball valve - GIF

Machining a giant ball valve.

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Previously:

https://www.homemadetools.net/forum/...059#post172055
https://www.homemadetools.net/forum/...994#post156992
https://www.homemadetools.net/forum/...880#post171413
https://www.homemadetools.net/forum/...540#post170207
https://www.homemadetools.net/forum/...329#post158092

I thought it was King Kong's wedding ring.

Given that it’s basically a sphere, the only hard part is the size.