Ball Nose Carbide End Mill NKN (standard length)D1 Ø4,5 mm × D2 Ø5 mm × L1 10 mm × L 50 mm × R 2,25 mm × Z2
- D1 — Cutting diameter
- Ø4,5mm
- D2 — Shank diameter
- Ø5mm
- L1 — Flute length
- 10mm
- L — Overall length
- 50mm
- R — Corner radius
- 2,25mm
- Z — Number of flutes
- 2
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Starting cutting values for FZ.NKN0452
Calculated for a Ø4.5 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 | 8,135 | 0.035 | 569 | TiAlN, AlTiN |
| Ostenitik paslanmaz (304/316) | 85 | 6,013 | 0.028 | 337 | AlCrN, AlTiN |
| Alüminyum, dövme (6061/7075) | 170 | 12,000 | 0.068 | 1,620 | Kaplamasız cilalı, DLC |
| Sertleştirilmiş çelik 45–55 HRC | 85 | 6,013 | 0.018 | 216 | 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.
- 4.5 mm is the most common range in mould detail work. In deep slots the limit is chip evacuation; if chips are recut, the cutting edge is lost within one revolution.
- Length of cut to diameter ratio 2.2; standard configuration. At full engagement deflection becomes measurable and an allowance should be left on the side wall.
- 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.
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