Video of the turning of an axisymmetric foam model with my three axis MPCNC to make an aluminum knob with lost foam casting:
The tool used was fixed:
The initial piece was a parallelepiped foam:
I made a tool to take the foam in the spindle:
After the turning the piece had to be finished:
I finished it with sand paper:
And I covered it with quartz paint:
The model was inserted in the sand to do the casting:
The aluminum was melted with an electric oven:
And a raw piece was obtained from the casting:
To finish the obtained piece on the lathe, I made some supports with my 3D Printer:
Turning the mounting face:
And threading the hole to mount the knob:
