I've made a bowl with spikes on the outside. I used the detail that I use on my carvers mallets to attach the spikes to the bowl. This entails carving a radial joint on the CNC machine. Half the joint is on the end of a piece of walnut and the other half on the cherry bowl. The two pieces are glued together. This bowl has 15 spikes. Once the two parts are glued together, I then have to carve the walnut and the cherry to reveal the pattern in the joint between the two pieces. I really like how it turned out. It's a simple round bowl on the inside and a very spiky, pointy surface on the outside.
Tools used in this project can be found at
http://www.frankmakes.com/
Avid CNC: https://www.avidcnc.com/
Carter and Son Toolworks: https://carterandsontoolworks.com/
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0:00 (introduction)
0:58 (inside of bowl)
4:19 (making spikes)
5:29 (attaching spikes)
8:22 (carving)
11:10 (conclusion)