Monday, November 29, 2010
Metal Spinning Demonstration at the Kingston Woodturners
Photo above shows Dave mounting a copper disk on the lathe. The copper is from some sheet copper that was part of my house roof. Dave has annealed the copper by heating it cherry red with a propane torch before mounting it. It is clamped between the wood form on the headstock and a small wood plug against the live center in the tailstock.
Here you can see Dave leaning in to apply pressure on the copper. As the tool moves to the outside the speed of the lathe must be increased. The tip of the tool is held below center.
Here one can see the copper disk taking shape.
The disk was a little larger than the form so the upper edge was not held against the form hence the ripples in the form. This needs soaking in a water, vinegar and salt mixture to remove the oxide coating.