Corner Radius Carbide End Mill NRN (standard length)D1 Ø2 mm × D2 Ø4 mm × L1 6 mm × L 50 mm × R 0,2 mm × Z4
- D1 — Cutting diameter
- Ø2mm
- D2 — Shank diameter
- Ø4mm
- L1 — Flute length
- 6mm
- L — Overall length
- 50mm
- R — Corner radius
- 0,2mm
- Z — Number of flutes
- 4
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Starting cutting values for FZ.NRN020024
Calculated for a Ø2 mm cutting diameter and 4 flutes. Radial engagement is taken as ae = 0.5×D and axial depth of cut as ap = 1×D. Values assume a carbide tool and medium duty conditions; machine rigidity and workholding change the result. These are calculated reference values. They change considerably with the machine, tool holder, clamping and the result you need; applying them remains the responsibility of the user.
| Workpiece material | Vc (m/min) | n (rpm) | fz (mm/tooth) | vf (mm/min) | Suggested coating |
|---|---|---|---|---|---|
| Alaşımlı çelik (42CrMo4) | 75 | 12,000 | 0.012 | 552 | TiAlN, AlTiN |
| Ostenitik paslanmaz (304/316) | 75 | 12,000 | 0.009 | 432 | AlCrN, AlTiN |
| Alüminyum, dövme (6061/7075) | 75 | 12,000 | 0.023 | 1,080 | Kaplamasız cilalı, DLC |
| Sertleştirilmiş çelik 45–55 HRC | 75 | 12,000 | 0.006 | 288 | nACo/AlTiSiN, AlCrN |
About this size
- Corner radius end mill, corner radius R 0.2 mm; combines the side cutting capability of a square end mill with corner strength. When axial engagement exceeds the radius, the effective diameter equals the nominal diameter.
- 2 mm sits in the micro machining range: reaching the target cutting speed requires very high spindle speed and most machines hit their rpm ceiling, so in practice Vc stays below target. In this range holder runout matters more than the tool itself.
- Length of cut to diameter ratio 3; standard configuration. At full engagement deflection becomes measurable and an allowance should be left on the side wall.
- 4 flutes. Table feed is directly proportional to flute count (vf = n x fz x z); when flute count changes, feed per tooth is held constant and table feed is recalculated.
These notes are derived from the geometry and ratios of this size and are general in nature. Machine, holder, clamping and coolant conditions change the outcome considerably.
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