Turning a Sphere into an Octahedron

Turning Symposium 2018
Michael Foster

Guild of New Hampshire Woodworkers
Ninth New England Woodturning Symposium

Saturday May 12, 2018
Pinkerton Academy in Derry, NH

Mike Foster
Turning a Sphere into an Octahedron

I will show how to turn a sphere using the shadow method.  I will cover a bit of the basic math used mark out the blank to quickly get the wood to a shape near round, then turn the result using cup centers on the headstock and tailstock to create a sphere using the shadow method without a jig.

The resulting sphere will be marked for 8 centers that will then be used to turn the sphere between centers to create an octahedron.  During the demo I will explain how I expand on the technique to create a number of geometric forms and show some examples of the results.