Feed rate is how fast the table moves, in inches per minute. It is built from the chip each tooth should take, how many teeth there are, and how fast the spindle turns.
Feed (IPM) = RPM × chip load × flutes
What the variables mean
| Symbol | Meaning |
|---|---|
| IPM | Feed rate (inches per minute) |
| RPM | Spindle speed |
| Chip load | Feed per tooth (inches) |
| Flutes | Number of cutting edges |
Worked example
At 2,292 RPM, 0.003 in chip load, 4 flutes: Feed = 2292 × 0.003 × 4 = 27.5 IPM.
Skip the arithmetic with the Feed Rate Calculator in Feeds & Speeds.