How to Use a CNC Router for Shell Inlay

Here’s how I designed a shell inlay for a guitar headstock using Fusion 360, and cut the inlay using my CNC router.

Part 1 – Design in Fusion 360

Part 2 – Cutting Shell Material

Resources

Here are links to some of the tools, materials and software that I’m using in this project:

AutoDesk Fusion 360 for personal use
Next Wave CNC Shark Router
Carbide 2-flute Down-cut end-mills
1/32″ Carbide shell cutter
Phenolic backer board

CNC Feeds & Speeds

UsageBitRPMDepth of
cut		Plunge
mm/min		Cut
mm/min		Comments
Wood pocket0.0313″ (0.80mm)
2-flute downcut		250000.5mm roughing
0.2mm finish		200250
Shell0.0313″ (0.80mm)
shell cutter		250000.3mm125250