Screw-type wood chipper - videos

Screw-type wood chipper. By Dorel Borlea.

8:39 video:
https://www.youtube.com/watch?v=PjONHueg7Gg

8:01 video:
https://www.youtube.com/watch?v=I7fzD3WCJc8

OK, a lot of time, materials and effort, and it is still not finished.

1. How do you sharpen the blade.
2. Why make something so complex when the alternative, flat plate, straight blade, flywheel type design
has superior functionality and ease of service.

Part 3. By Dorel Borlea. 8:44 video:

https://www.youtube.com/watch?v=Tp2i2rSQC24

I like how it self-feeds

They have some well-worn tools.
And not in a good way...