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Feed override formula and how to use it

The feed rate override dial on CNC controls lets operators adjust the programmed feed in real time. This calculator converts the programmed feed and override percentage to the actual feed rate the tool sees.

• Actual feed = programmed feed × (override % / 100)
• Chip load change = (override % − 100) — the percentage change from programmed chip load
• At 80% override, chip load drops 20%; at 120%, it rises 20%

How to use this Feed Rate Override Calculator

Enter your programmed feed rate (mm/min) and the override percentage set on the machine control. The calculator shows the actual feed the tool experiences and the chip load change relative to the programmed value.