Mini lawnmower from angle grinder. Perhaps not the safest homemade tool in the world, but it looks like fun to use. By Sean Beardon. 11:26 video:
https://www.youtube.com/watch?v=2_OoqDxeIds
Previously:
https://www.homemadetools.net/forum/...6993#post84808
https://www.homemadetools.net/forum/...927#post144664
https://www.homemadetools.net/forum/...657#post143508
https://www.homemadetools.net/forum/...2421#post76333
https://www.homemadetools.net/forum/...2740#post97020