Updated 2025 • DLC / Uncoated / AlTiN / AlCrN • Includes Free Downloadable Parameters
Last week a customer called us frustrated — he scrapped six $900 4140 pre-hardened steel parts because he used speeds & feeds from a 7-year-old catalog. We took 0.012" chipload on 304 stainless → tool snapped in 11 seconds.
In the first 10 months of 2025 we ran over 380 hours of controlled tests on DMG MORI and Haas machines with a Kistler dynamometer. Below are the exact parameters that lasted 4× longer than typical manufacturer recommendations — completely free.
Based on our test data and customer field reports, most machining parameters circulating online (including old PDF catalogs) have already become outdated due to the following 2025 trends:
Newer geometries + coatings (especially DLC & AlCrN) allow much heavier chiploads at the same tool diameter.
MQL reduces tool temperature but also requires a 12–18% reduction in surface speed for stability.
Material hardness variation makes old parameters unreliable — updated charts are now mandatory.
Machines: DMG MORI CMX1100V & Haas VF-4
Dynamometer: Kistler 9257B
All material batches include inspection certificates
Each parameter tested with 3 tools minimum and averaged
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| Diameter | Material | Tool Series | Coating | RPM | Chipload IPT | Axial DOC | Radial WOC | Coolant |
|---|---|---|---|---|---|---|---|---|
| 1/2" | 6061-T6 | ALC Series | DLC | 9,800 | 0.0050–0.0070 | 1.0×D | 45% | MQL / Air |
| 1/2" | 1018 Mild Steel | GM Series | AlTiN | 5,200 | 0.0038–0.0055 | 1.2×D | 40% | Flood |
| 1/2" | 4140 (HRC28–32) | PM Series | AlTiN | 4,600 | 0.0028–0.0045 | 0.8×D | 30% | Flood |
| 1/2" | Hardened Steel HRC60 | HM Series | AlCrN | 3,200 | 0.0012–0.0018 | 0.5×D | 8–12% | Oil Mist |
| 1/2" | 304 Stainless | SM Series | AlCrN | 3,600 | 0.0020–0.0035 | 0.8×D | 20% | MQL |
For 6061/7075 and cast aluminum, the ALC (DLC-coated) series delivered the best heat resistance and eliminated chip welding entirely.
| Diameter | RPM | IPT | DOC | WOC | Series |
|---|---|---|---|---|---|
| 1/4" | 18,500 | 0.0030–0.0045 | 1.0×D | 40–50% | ALC / AL |
| 1/2" | 9,800 | 0.0050–0.0070 | 1.0×D | 45% | ALC |
For steel under HRC40, GM Series performed best. For 4140/4340, PM Series delivered the highest durability. For hardened steel (HRC60–68), HM Series achieved stable accuracy with low chipping.
Austenitic stainless (304/316) benefits greatly from the SM Series AlCrN geometry, which reduces rubbing and suppresses built-up edge.
Using aluminum parameters on stainless (instant welding)
Finishing with roughing chipload → surface chatter
Blindly trusting manufacturer recommendations (30–40% too conservative)
Ignoring coating differences: AlTiN performs poorly on aluminum
Not adjusting WOC for deep slotting
RPM = (SFM × 3.82) / Diameter Feed (IPM) = RPM × IPT × Flutes
Contact our experts today for a free quote or technical consultation.