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The material to be cut	Pre-hardened steel, hardened steel 40-50HRC		Hardened steel 50-60HRC		Hardened steel 60-68HRC
End mill blade diameter	Speed	Feed rate	Speed	Feed rate	Speed	Feed rate
mm	（min﹣1）	（mm/min）	（min﹣1）	（mm/min）	（min﹣1）	（mm/min）
1	40000	320	40000	320	32000	260
2	40000	800	24000	480	16000	320
3	32000	1020	16000	510	11000	350
4	24000	1250	12000	620	8000	420
5	19000	1360	9500	680	6400	460
6	16000	1540	8000	770	5300	510
8	12000	1540	6000	770	4000	510
10	9600	1540	4800	770	3200	510
12	8000	1600	4000	800	2700	540
14	6800	1340	3400	680	2300	460
16	6000	1200	3000	600	2000	400
18	5300	1060	2700	530	1800	360
20	4800	960	2400	480	1600	320

Points to note:

A, the first use of tungsten steel tool, feed speed according to the above data of 50% of the trial cutting, cutting state is stable and then feed speed will be raised one by one to ensure tool stability.

B. use tungsten steel tool with high precision, high rigidity and good Dynamic equilibrium. When the tool's deflection accuracy exceeds 0.01 mm, it needs to be improved before cutting.

C, when installing the tool, the longer the tool extends the chuck, the better. If the tool extends a long length, it needs to adjust the rotation speed, feed speed or cutting quantity to ensure the stability of the tool.

D, in the milling if abnormal vibration sound occurs, one by one adjust the spindle speed, feed speed or cutting volume until the situation improves.

E, if tungsten steel end mill must be used for direct Z-axis feed (end mill) , the spindle speed does not change but please use the above feed speed at 25% .

F, spray or jet cooling is the best way for milling steel. When milling stainless steel, titanium alloy and heat-resistant alloy, it is recommended to use insoluble cutting fluid for cooling.

G. in the case of poor rigidity of machine tool and workpiece installation, there will be vibration and abnormal sound between the workpiece and the machine tool.