Drill a perfectly centered hole in a sphere by first counterboring a hole in a scrap board clamped to your table. Drill the counterbore using a Forstner or spade bit...
Drill a Centered Hole in a Sphere
Drill a perfectly centered hole in a sphere by first counterboring a hole in a scrap board clamped to your table. Drill the counterbore using a Forstner or spade bit...