Drill bit sharpening jig. By JSK-koubou. 16:18 video:
https://www.youtube.com/watch?v=Xn0mN7Km0tU
Previously:
21 plans for homemade drill presses
https://www.homemadetools.net/forum/...944#post171646
https://www.homemadetools.net/forum/...409#post169737
https://www.homemadetools.net/forum/...038#post120318