Cutting the pockets for a marble game board on the Shapeoko 4 CNC machine with the Amana Tool 45914 5/16” radius core box bit all available from @toolstoday. This bit left a perfectly clean pocket for marbles to fall right into. The plans for the project are also available on our site, item no. MARBLE-GAME ---- RPM: 18,000 Feed Rate: 70ipm Plunge Rate: 35ipm Depth per pass: .125" ---- Peck drill marble pockets Plunge Rate: 35ipm Peck Depth: .125” | Toolstoday Router Bits and Saw Blades