WoodWorkCalc

CNC Speeds & Feeds Calculator

Estimate spindle speed, feed rate, and chip load for your CNC router based on wood type, bit diameter, and flute count — optimized for precise and efficient woodworking.

Safe CNC Feeds & Speeds

Sets recommended surface speed (SFM) and cutting force (Kc). Harder materials → lower chipload, higher force.

Rigidity & max practical feed. Stiffer frames tolerate higher feed and deeper passes with less chatter.

Power vs RPM curve limits what cuts are sustainable. Heavier cuts need usable watts near your chosen RPM.

Geometry affects chip evacuation & finish. Downcuts/compression push chips down — favor ramping & lighter slotting.

Adjust and watch feeds update in real time. All conversions are automatic.

Larger tools carry higher chiploads & deeper DOC, but need more power and clearance in corners.

Adjust and watch feeds update in real time. All conversions are automatic.

More flutes = more cuts per rev. Great for finish at high RPM with strong chip evacuation.

Adjust and watch feeds update in real time. All conversions are automatic.

Length from collet to tip. Longer = more deflection. Keep as short as practical for rigidity.

Adjust and watch feeds update in real time. All conversions are automatic.

Width of cut per pass. Lower AE triggers chip-thinning (this calc includes that).

Adjust and watch feeds update in real time. All conversions are automatic.

Depth per pass. Leave 0 for auto based on material and bit. Reduce for hard materials or long stickout.

Adjust and watch feeds update in real time. All conversions are automatic.

Pro override (mm/tooth). 0 = auto from tool size + material + bit type + cooling.

Adjust and watch feeds update in real time. All conversions are automatic.

0 = auto from SFM & diameter (never below 10 000). Respect spindle min/max.

Enable ramping when slotting with downcuts/compression. Use helical when pocketing if CAM supports it.

Feed Recommendations

Start with 🐢 Slow. If cut is quiet with healthy chips (not dust), step to ⚖️ Medium or cautiously to ⚡ Fast.

🐢 Slow
Feed2881 mm/min (113.4 in/min)
Plunge1152 mm/min (45.4 in/min)
Depth/Pass1.72 mm (0.068 in)
Deflection0.086 mm (0.0034 in)
Power38 W (avail ~ 700 W)
Active RPM13752 rpm
⚖️ Medium
Feed4802 mm/min (189.0 in/min)
Plunge1921 mm/min (75.6 in/min)
Depth/Pass2.86 mm (0.113 in)
Deflection0.086 mm (0.0034 in)
Power63 W (avail ~ 700 W)
Active RPM13752 rpm
⚡ Fast
Feed5000 mm/min (196.9 in/min)
Plunge2000 mm/min (78.7 in/min)
Depth/Pass3.15 mm (0.124 in)
Deflection0.086 mm (0.0034 in)
Power66 W (avail ~ 700 W)
Active RPM13752 rpm
Setup Notes
MaterialOak (Hardwood)
CoolingDry
MachineGeneric Desktop Router
SpindleMakita RT0701C (710 W Trim Router)
Diameter6.35 mm (0.250 in)
Stepover3.00 mm (0.118 in)
Chip Load0.120 mm/tooth (0.0047 in/tooth)
StrategySlotting: shallow ap, ramp-in (enabled), ensure strong chip evacuation.

CAM previews are ready to paste — imperial first, metric in parentheses.

CAM Preview — 🐢 Slow
Tool0.250" (6.35 mm) Upcut End Mill
RPM13752
Feed Rate113.4 in/min (2881 mm/min)
Plunge Rate45.4 in/min (1152 mm/min)
Depth/Pass0.068 in (1.72 mm)
Stepover0.118 in (3.00 mm)
CAM Preview — ⚖️ Medium
Tool0.250" (6.35 mm) Upcut End Mill
RPM13752
Feed Rate189.0 in/min (4802 mm/min)
Plunge Rate75.6 in/min (1921 mm/min)
Depth/Pass0.113 in (2.86 mm)
Stepover0.118 in (3.00 mm)
CAM Preview — ⚡ Fast
Tool0.250" (6.35 mm) Upcut End Mill
RPM13752
Feed Rate196.9 in/min (5000 mm/min)
Plunge Rate78.7 in/min (2000 mm/min)
Depth/Pass0.124 in (3.15 mm)
Stepover0.118 in (3.00 mm)