Mechanical circular saw blade sharpener - GIF

Mechanical circular saw blade sharpener. Look how this one uses an ordinary file.

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Previously:

https://www.homemadetools.net/forum/...596#post155378
https://www.homemadetools.net/forum/...154#post153665
https://www.homemadetools.net/forum/...726#post139978
https://www.homemadetools.net/forum/...057#post120382
https://www.homemadetools.net/forum/...0714#post73000

That's fascinating. A great old machine, simple but a lot of math involved in its design.