Cutting wood threads - GIF

Cutting wood threads.

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Previously:

Bone screw with opposing threads - photo
Different threads visualized - GIF
Embossing threads on tubes - GIF
Machining threads on a part - GIF
Making threads from linden bark - GIF
The Secret Life of Components: Screw Threads - video

About $60 US for tap and die set 1" x 6 tpi

is the stock wet before cutting? or is that something other than water?