4 Flute Round Nose End Mills

Processed Materials	Cast Iron Nodular Cast Iron		Carbon Steel, Alloy Steel ~750N/mm²		Carbon Steel, Alloy Steel ~30HRC		Pre-Hardened Steel, Quenched and Tempered Steel ~40HRC		Stainless Steel		Pre-Hardened Steel, Quenched and Tempered Steel ~50HRC
Diameter (mm)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)
3	14000	820	14000	820	13000	755	10600	630	7500	145	8500	490
4	10800	840	10800	840	10000	770	8000	640	5500	145	6500	500
5	8200	880	8200	880	7600	810	6400	670	4500	145	5000	530
6	7000	900	7000	900	6400	830	5300	690	3700	160	4200	540
8	5200	890	5200	890	4800	815	4000	680	2800	160	3200	550
10	4200	880	4200	880	3800	810	3200	670	2200	160	2500	520
12	3500	880	3500	880	3200	810	2650	670	1850	160	2100	520
16	2600	680	2600	680	2400	630	2000	525	1400	120	1600	490
Maximum Cutting Depth
								Tool Diameter	Cutting Depth ap
								∅1<D<∅3	0.15D
								∅3<D	0.3D

1. The above table shows the standard values for side milling machining. When cutting grooves with the tool, the speed should be 50%~70% of the above table, and the feed rate should be 40%~60% as the standard value.
2. Please use high-precision machine tools and tool holders.
3. Please use air cooling or cutting fluid that is less likely to produce smoke.
4. It is recommended to use sequential milling for side milling.
When the rigidity of the machine tool and workpiece installation is poor, vibration and abnormal sound may occur. In this case, the speed and feed rate in the table above should be reduced year-on-year.
6. Minimize the tool overhang length as much as possible without interference.

The NNC-4R four flute round nose milling cutter is available in a variety of sizes, covering different tool diameters, blade lengths and R angle ranges, and can be flexibly matched with different sub-models to meet diverse processing needs. Each sub-model can perform stably in different occasions from finishing to roughing, making the processing process more targeted and efficient.

It adopts a specially designed round nose blade shape to effectively reduce cutting vibration and improve the finish of the machined surface. The 4 flute structure not only improves the chip removal ability of the tool, but also enhances the rigidity of the blade, providing more reliable support for continuous high-speed cutting.

Through the combination of high-precision grinding and advanced coating technology, NNC-4R 4 flute round nose end mills has outstanding performance in wear resistance and heat resistance. The precise manufacturing process can minimize the tool size error, and the coating effectively suppresses friction and cutting heat, so that the tool life can be extended and stable operation can be achieved under higher cutting parameters.

This round nose milling cutter is suitable for processing a variety of common materials, such as carbon steel, stainless steel, mold steel and copper alloy, and can cope with higher hardness workpieces to a certain extent. For precision machining applications requiring high surface quality, NNC-4R can also provide excellent finished product finish.