CNC Feed Rate Calculator

How It Works

CNC feed rate is calculated as RPM × number of flutes × chip load per tooth. Chip load is the thickness of material each cutting edge removes per revolution — too low causes rubbing and heat, too high causes bit breakage. For wood, typical chip loads range from 0.003" to 0.010" depending on bit size and wood hardness. Plunge rate should be 40-50% of feed rate. Stepover (width of cut) is typically 40-50% of bit diameter for profiling cuts and up to 80% for roughing. Always start conservative and increase speed after test cuts.