From HacDC Wiki
PCB Isolation Routing
- 23mil diameter End Mill, suitable for milldrilling holes
- 47mil diameter End Mill, suitable for outline cutting
- 63mil diameter End Mill, perhaps more robust for outline cutting
- Drill bit variety from ~6mil to ~38mil cutting diameter.
- Single Sided Copper Clad Board
- Medium Density Fiberboard
- Excellent practice material, easy on bits, and quickly laser cut into standard-size blocks.