Feed & Speed Calculator — LBplugins CNC

🔧 Tool / Bit

Tool Type

Diameter (mm) 6.35

Flutes 2

Flute Length (mm)

Stick-out (mm)

Tool Material

🪵 Material

Chip Load (mm/tooth) 0.04

SFM / Cutting Speed 500

📐 Cut Parameters

Depth of Cut (mm) 3

Width of Cut (mm) 3.175

Router Max RPM

Router Min RPM

Metric (mm/min) — uncheck for Imperial (in/min)

📊 Results

—
Spindle RPM

—
Feed Rate
mm/min

—

Plunge Rate

mm/min

—

Actual Chip Load

mm/tooth

—

Material Removal

cm³/min

—

Tool Deflection

mm (est.)

—

Actual SFM

ft/min

—

Est. Power

Watts

💡 Quick Reference

RPM = SFM × 3.82 ÷ Diameter (mm)
Feed Rate = RPM × Flutes × Chip Load
Plunge Rate = ~50% of Feed Rate (softer) to ~25% (metals)
Chip Load = Feed Rate ÷ (RPM × Flutes)
MRR = DOC × WOC × Feed Rate ÷ 1000
Chip Thinning = CL × √(d / (2×WOC − WOC²/d)) when WOC < 50% d
Deflection ∝ Force × Stickout³ ÷ Diameter⁴

📋 Chip Load Reference

Material	⅛" (3mm)	¼" (6mm)	½" (12mm)
Softwood	0.025-0.04	0.04-0.06	0.06-0.10
Hardwood	0.02-0.035	0.035-0.055	0.05-0.08
Plywood/MDF	0.025-0.04	0.04-0.06	0.06-0.10
Acrylic	0.03-0.05	0.05-0.07	0.07-0.10
HDPE	0.04-0.06	0.06-0.10	0.10-0.15
Alu 6061	0.02-0.03	0.03-0.05	0.05-0.07
Brass	0.015-0.025	0.025-0.04	0.04-0.06
Mild Steel	0.01-0.02	0.02-0.035	0.03-0.05