Feed rate calculator converts spindle RPM, chip load per tooth, and number of flutes into the machine’s programmed feed rate (IPM) for milling.
Calculate table feed rate in inches per minute from spindle RPM, chip load per tooth, and flute count.
Formula: IPM = RPM times Chip Load times Number of Flutes.
How it works
Feed rate is how fast the tool travels through the material, set so each tooth removes a consistent chip load. Multiply RPM by chip load and flute count to get the table feed.
FAQ
What chip load should I use? Check the tool manufacturer chart; it varies by tool diameter, material, and flute count.
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How it works
Feed rate scales directly with all three inputs; more flutes or a higher chip load moves the table faster at the same RPM, since more material is being removed per spindle revolution. Chip load per tooth is normally selected from a tool manufacturer’s chart for the specific tool diameter, flute count, and material, then feed rate is calculated from it rather than picked directly.
FAQ
What chip load should I use? Chip load depends heavily on tool diameter, flute count, and material. Smaller-diameter tools need noticeably lower chip loads than larger ones of the same type; consult the tool manufacturer’s speed and feed chart for your specific cutter rather than a single rule of thumb.
Related Guides
CNC Calculators · Chip Load Calculator · Spindle RPM Calculator