You create a 3d model and then use the tool to whittle away the block of material
http://m.youtube.com/watch?hd=1&v=krRTZqFFn6c&desktop_uri=%2Fwatch%3Fv%3DkrRTZqFFn6c%26hd%3D1

Robin Edgar
Organisational Structures | Technology and Science | Military, IT and Lifestyle consultancy | Social, Broadcast & Cross Media | Flying aircraft
robin@edgarbv.com
https://www.edgarbv.com