Enter your current cutting speed, feed and tool life, then a proposed new speed and feed — the calculator predicts the new tool life using the extended Taylor equation, with exponents matched to your tool material.
Based on the extended Taylor tool life model (V · Tn · fy = C) — cutting speed is the dominant lever, feed second. Predictions are planning estimates: real life varies with workpiece hardness, runout, coolant condition and regrind quality.
| Tool & application | Reported life | Source |
|---|---|---|
| Carbide gundrill, Ø10.5 mm, transmission shafts | ~200–340 holes per tool | Carbide gun drill study (K40UF) |
| Indexable carbide drill, 4340 steel, 0.937 in | 320 holes per insert | Allied Machine 4TEX case study |
| Coated carbide drills (wear test) | 500 (uncoated) / 3,400 (TiAlN) / 4,000 (AlCrN) holes | Reground-carbide comparison study |
| Gundrill regrind interval | ~50–200 m drilled length per regrind (by material) | Deep Hole Drilling Guide — Tool Regrinding |