Physics-Accurate CNC Chip Load Optimization • Tool Life Protection
CNC Router Feeds, Speeds & Chip Load Calculator
Prevent bit breakage, chatter, and edge burning. Calculate recommended Spindle RPM, Feed Rate (IPM & mm/min), and chip load across solid woods, sheet goods, and plastics.
1. Stock Material
Multi-ply birch, pre-finished maple, veneer core
2. Endmill Bit & Geometry
Spindle Speed (RPM)18,000 RPM
Recommended Cutting Feed Rate
468IPM (Inches / Min)
Metric Velocity11,887mm / min
Target Chip Load
0.013"
0.33 mm / tooth
Plunge / Ramp Rate
234 IPM
5944 mm/min
Single Pass Max
~10 mm
1.5× bit diameter
Machinist Tip: Compression bits require cutting deeper than the upcut tip (typically >5mm / 0.2") on the first pass to avoid chipping the top veneer.
Engineered for Homag, Biesse, Laguna, ShopSabre & Avid CNCs
Reference Speeds for Baltic Birch / Plywood (18,000 RPM, 2-Flute)
Recommended feed rates across all standard CNC endmill diameters
| Bit Diameter | Chip Load | Feed Rate (IPM) | Velocity (mm/min) | Plunge (IPM) |
|---|---|---|---|---|
| 1/8" (3.175 mm) | 0.0072" | 259 IPM | 6,579 | 130 |
| 4.0 mm | 0.0091" | 328 IPM | 8,331 | 164 |
| 1/4" (6.35 mm) — Industry Standard | 0.013" | 468 IPM | 11,887 | 234 |
| 8.0 mm | 0.0149" | 536 IPM | 13,614 | 268 |
| 3/8" (9.525 mm) | 0.0163" | 587 IPM | 14,910 | 294 |
| 1/2" (12.7 mm) — Heavy Production | 0.0188" | 677 IPM | 17,196 | 339 |