How to use cnc feed rate from chipload
What this calculation does
A chipload calculation converts a selected cutter chipload into a feed rate from spindle speed and the cutter’s number of flutes.
Use values from current cutter and machine documentation, then enter spindle speed, flute count and the chosen chipload.
Enter the measurements
- Spindle speed: Enter spindle revolutions per minute.
- Cutting edges/flutes: Count the cutting edges that engage each revolution.
- Chosen chipload per tooth: Enter the selected inches of feed per tooth.
Formula and variables
Feed rate (in/min) = spindle speed (RPM) × number of flutes × chosen chipload (in/tooth).
The product of RPM, flute count and inches per tooth gives inches per minute. Every input must describe the same cutter setup.
Read the result
At 18,000 RPM, two flutes and 0.005 in per tooth, the arithmetic feed rate is 180 in/min.
Worked example
Inputs: 18,000 RPM, two flutes and 0.005 in/tooth chosen chipload
- Feed rate = 18,000×2×0.005.
- The product is 180 in/min.
Expected result: 180 in/min calculated feed rate
Frequently asked questions
Does this recommend a safe feed rate?
No. The entered chipload must come from the actual tool, material, cut and machine instructions.
Does it check workholding or tool condition?
No. Machine limits, tool condition, extraction and operator safety are not evaluated.
Conditions, presets and technical notes
This is a unit-consistent arithmetic relationship, not a universal cutting recommendation. Current values must come from instructions for the actual cutter, material, depth of cut, machine and setup. Machine limits, tool condition, workholding, extraction and operator safety are not evaluated.
Enter chipload from current instructions for your cutter, material, depth and machine. This tool does not recommend a safe setting.