Calculate feed rate from feed per revolution and spindle RPM, or calculate the required feed per revolution and machining time for lathe operations.
Enter the machining parameters to calculate.
How do I calculate lathe feed rate? Multiply feed per revolution by spindle RPM. For example, 0.20 mm/rev × 637 RPM = 127.4 mm/min.
What is feed per revolution? Feed per revolution is how far the cutting tool moves for each complete spindle revolution.
What is feed rate? Feed rate is the linear movement of the cutting tool per minute. It is commonly expressed in mm/min or inches/min.
Does increasing RPM increase feed rate? Yes, if feed per revolution stays constant. Doubling RPM doubles the calculated linear feed rate.
Does feed rate affect surface finish? Yes. Feed per revolution is an important factor in turning surface finish, although tool nose radius, tool geometry, material, vibration and other factors also matter.
Can I use this for facing? Yes, but conventional fixed-RPM facing changes surface speed as the tool approaches the spindle centre. CNC constant-surface-speed operation requires additional consideration.
Can I calculate machining time? Yes. Enter the tool travel distance along with feed per revolution and RPM.
What feed should I use for steel? There is no universal value. The correct feed depends on the steel grade, cutting tool, insert geometry, depth of cut and machine setup.
Can this calculate inch feed rates? Yes. Select Imperial and enter feed in inches per revolution and cutting length in inches.
Does this include acceleration and deceleration? No. The calculated machining time represents constant cutting feed and does not include approach, acceleration, deceleration, tool changes or other non-cutting time.