Flaming hot internal thread machining - GIF

Flaming hot internal thread machining.

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Previously:

https://www.homemadetools.net/forum/...443#post189129
https://www.homemadetools.net/forum/...814#post156191
https://www.homemadetools.net/forum/...363#post185233
https://www.homemadetools.net/forum/...676#post190072
https://www.homemadetools.net/forum/...144#post191670

Looks like the tapered API thread used on oilfield tubing

cut full depth in a single pass?
Nice surface finish if that is the case.