Ball Nose Carbide End Mill NKN (standard length)D1 Ø18 mm × D2 Ø18 mm × L1 24 mm × L 100 mm × R 9,0 mm × Z2
- D1 — Cutting diameter
- Ø18mm
- D2 — Shank diameter
- Ø18mm
- L1 — Flute length
- 24mm
- L — Overall length
- 100mm
- R — Corner radius
- 9,0mm
- Z — Number of flutes
- 2
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Starting cutting values for FZ.NKN1802
Calculated for a Ø18 mm cutting diameter and 2 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) | 115 | 2,034 | 0.115 | 468 | TiAlN, AlTiN |
| Ostenitik paslanmaz (304/316) | 85 | 1,503 | 0.092 | 277 | AlCrN, AlTiN |
| Alüminyum, dövme (6061/7075) | 550 | 9,726 | 0.217 | 4,231 | Kaplamasız cilalı, DLC |
| Sertleştirilmiş çelik 45–55 HRC | 85 | 1,503 | 0.056 | 168 | nACo/AlTiSiN, AlCrN |
About this size
- Ball nose end mill; used for three dimensional surface finishing and curved mould surfaces. At shallow axial engagement the effective diameter is smaller than the nominal diameter, so cutting speed must be calculated from the effective diameter.
- At 18 mm spindle power and torque start to be the limit. Required power should be calculated before programming, otherwise the machine reduces feed on its own and chip thickness drops below target.
- Length of cut to diameter ratio 1.3; the most rigid configuration in this series. Axial engagement can be increased comfortably.
- 2 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.
Nearby sizes in this series
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