"a Sphere Making Apparatus" -in phenolic, assorted metal fittings
This is a device I designed and fabricated for turning spheres upon the wood lathe. It can turn spheres from one half inch up to eight inches in diameter.
The various components are pecisely machined out of an industrial grade phenolic, and includes a large thrust bearing for the pivot arm. Rising out of the central machined bolt are swappable brass pointed rods that indicate the exact center of the swing-arm rotation point: this allows the apparatus to be precisely positioned relative to the wood turning within the lathe.
A major flaw in this design is that the presentation of the cutter is scraping the material, not cutting. This is a significant difference, and the resultant finish straight off the tool requires copious sanding: not insurmountable, but there is room for improvement within the design.