Wood lathe from engine crankcase. By Workshop Hobby. 23:15 video:
https://www.youtube.com/watch?v=KUCiHiGskWo
Related:
Dremelathe Woodworking Station by Tuomas
35 sets of plans for homemade woodturning lathes, pole lathes, treadle lathes, and drill-powered lathes
