1. I picked a .125" end mill.
2. I set the cut depth per pass at .026 inches (5 passes to get through to .130 inch depth I set earlier)
3. I set the feed rate at 20 inches per minute (this is how fast the end mill moves sideways when cutting)
4. I set the plunge rate at 10 inches per minute (this is how fast the end mill descends into the material)
5. I set the RPM to 15,000.