Handheld belt sander. By Mirock's Toolworks. 8:58 video:
https://www.youtube.com/watch?v=vlXQ4KjRwCw
Previously:
25 plans for homemade belt sanders and grinders
https://www.homemadetools.net/forum/...258#post180925
https://www.homemadetools.net/forum/...176#post180499
https://www.homemadetools.net/forum/...945#post179577
