Ball Nose Carbide End Mill NKN (standard length)D1 Ø12 mm × D2 Ø12 mm × L1 24 mm × L 75 mm × R 6,0 mm × Z2
- D1 — Cutting diameter
- Ø12mm
- D2 — Shank diameter
- Ø12mm
- L1 — Flute length
- 24mm
- L — Overall length
- 75mm
- R — Corner radius
- 6,0mm
- Z — Number of flutes
- 2
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Starting cutting values for FZ.NKN1202
Calculated for a Ø12 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 | 3,050 | 0.072 | 436 | TiAlN, AlTiN |
| Ostenitik paslanmaz (304/316) | 85 | 2,255 | 0.057 | 257 | AlCrN, AlTiN |
| Alüminyum, dövme (6061/7075) | 452 | 12,000 | 0.135 | 3,240 | Kaplamasız cilalı, DLC |
| Sertleştirilmiş çelik 45–55 HRC | 85 | 2,255 | 0.035 | 158 | 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.
- 12 mm is the general purpose range. Spindle power is rarely the limit; the limit is usually the rigidity of the clamping and the holder.
- Length of cut to diameter ratio 2; 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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