Feed Rate Calculator Formula
Understand the math behind the feed rate calculator. Each variable explained with a worked example.
Formulas Used
Table Feed Rate (Vf)
feed_rate = feed_per_tooth * num_teeth * spindle_rpmFeed per Revolution
feed_per_rev = feed_per_tooth * num_teethVariables
| Variable | Description | Default |
|---|---|---|
feed_per_tooth | Feed per Tooth (fz)(mm/tooth) | 0.1 |
num_teeth | Number of Cutter Teeth (z) | 4 |
spindle_rpm | Spindle Speed (N)(RPM) | 1000 |
How It Works
Milling Feed Rate Calculation
The table feed rate determines how fast the workpiece moves past the cutter.
Formula
Vf = fz x z x N
where fz is the feed per tooth (chip load), z is the number of cutting teeth on the milling cutter, and N is the spindle speed in RPM. The result is the linear table feed rate in mm/min.
Worked Example
A 4-flute end mill at 1000 RPM with 0.1 mm/tooth feed.
feed_per_tooth = 0.1num_teeth = 4spindle_rpm = 1000
- 01Feed per revolution = 0.1 x 4 = 0.4 mm/rev
- 02Table feed = 0.1 x 4 x 1000 = 400 mm/min
Ready to run the numbers?
Open Feed Rate Calculator