Radius Turning Tool, cut ball-shaped end or turns a radius on lathe, cuts ball-shapes up to 3/4 inch diameter, made of corrosion-resistant blackened steel
CGTK - Ball Turner
What Is A Radius Ball Turner? - Summit Machine Tool
100 Lathe Radius Turner ideas | lathe, metal working, metal lathe
Radius Ball Turning Tool for Lathe 3/8" Shank with HSS Tool Bit Machine Tools | eBay
Lathe Ball Turning Attachment Build - YouTube
Mini Lathe Radius Turning Tool | 3D CAD Model Library | GrabCAD