KLMN

CNC Feed & Speed Planner

Dial in feeds, speeds, and cut parameters for common materials on hobby/DIY and rigid CNC machines. Metric/imperial aware, with an intuitive Conservative ↔ Aggressive tuning slider and rich inline hints.

Material & Tool

Pick your stock, cutter type, and diameter. Hints guide you to safe, productive numbers.

Sets chipload & SFM bands
Carbide tolerates higher SFM
Click a quick size or set precisely
mm
More flutes → lower chipload/tooth on light machines

Machine & Strategy

Tune for your machine’s stiffness and milling approach.

DIY routers need gentler settings
Side milling is easier than slotting
We’ll nudge into target SFM if needed
12000 RPM
Controls chipload and DOC/WOC within safe bands
30%

Tips for Best Results

  • Use an air blast; chips must leave the cut. Packed chips = heat = broken/end-burred tools.
  • Prefer helical ramp entries (2–3°) into pockets; avoid straight plunges.
  • If it squeals or walls are shiny/smeared → reduce WOC/DOC or lower RPM and keep chipload.
  • Clamp like you mean it: good fixturing beats tiny feed tweaks.
  • For plastics, keep chips thick and RPM moderate to avoid melting.

Calculated Recipe

All numbers update live as you adjust controls.

Chipload / Tooth
—
Target band adapts to material, diameter, flutes & machine
Feed Rate
—
feed = RPM × flutes × chipload
Surface Speed
—
Recommended: —
Recommended DOC (stepdown)
—
Based on diameter, operation & aggressiveness
Recommended WOC (stepover)
—
Fraction of diameter for side milling
Context

Material: —

Tool:

Machine: • Operation:

Notes for this cut

    How It’s Calculated

    Chipload/tooth starts from a material baseline (mm/tooth) for a 3.175 mm 1-flute tool, then scales by diameter, flute count, machine rigidity, and your Conservative↔Aggressive slider.

    Feed rate uses feed = RPM × flutes × chipload (in mm/min). Toggle Imperial to view IPM.

    SFM is computed as SFM = π × diameter(in) × RPM / 12. We suggest an RPM that keeps you in the recommended SFM band for the chosen material & tool.

    DOC/WOC are heuristics as fractions of tool diameter—higher for rigid machines and side-milling.