Ball Nose Carbide End Mill NKN (standard length)D1 Ø2,5 mm × D2 Ø4 mm × L1 5 mm × L 50 mm × R 1,25 mm × Z2
- D1 — Cutting diameter
- Ø2,5mm
- D2 — Shank diameter
- Ø4mm
- L1 — Flute length
- 5mm
- L — Overall length
- 50mm
- R — Corner radius
- 1,25mm
- Z — Number of flutes
- 2
$13.65
(list: $13.65)
- Same-day dispatch for orders before 15:00
- Genuine product, invoiced sale
Starting cutting values for FZ.NKN0252
Calculated for a Ø2.5 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) | 94 | 12,000 | 0.023 | 552 | TiAlN, AlTiN |
| Ostenitik paslanmaz (304/316) | 85 | 10,823 | 0.019 | 400 | AlCrN, AlTiN |
| Alüminyum, dövme (6061/7075) | 94 | 12,000 | 0.045 | 1,080 | Kaplamasız cilalı, DLC |
| Sertleştirilmiş çelik 45–55 HRC | 85 | 10,823 | 0.012 | 260 | 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.
- 2.5 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 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
Related Technical Guides
For choosing the right tool and working with the right parameters
Surface Roughness (Ra, Rz) and Finish Milling: Theoretical Calculation, Stepover Selection and Measurement
What Ra, Rz and Rmax actually measure, the changes brought by the ISO 21920 series, theoretical roughness calculated from nose radius and feed, scallop height and stepover selection in ball nose milling, and the cut-off rules.
13 min read
Trochoidal Milling and High Efficiency Machining (HEM/HSM): Engagement Angle, Parameters and MRR Calculation
The low radial, high axial engagement principle; engagement angle and chip thinning correction, material removal rate compared against full slotting, CAM naming conventions and machine tool requirements.
11 min read
Milling Titanium and Heat-Resistant Alloys (ISO S): Parameters, Cooling and Safety
In ISO S materials such as Ti-6Al-4V and Inconel 718, heat builds up on the cutting edge instead of leaving with the chip. Cutting speed limits, high-pressure coolant, trochoidal engagement control, notch wear and the risk of chip fire are covered together.
11 min read