Informative cutting conditions for hard-metal drills

Material	Orbital speed	Move (mm/zub)			Recommended coating
		d₁ <=6mm	d₁ <=12mm	d₁ <=25mm
Carbon alloy steel <38 Rc	91 - 110	0,025-0,038	0,038-0,063	0,076-0,127	TiN
Carbon alloy steel >38 Rc	43 - 91	0,025-0,038	0,038-0,076	0,076-0,127	TiN
Ductile impression steel	61 - 76	0,025-0,038	0,025-0,064	0,064-0,102	TiN
Anticorrosion steel, series 300	31 - 76	0,025-0,038	0,038-0,076	0,076-0,127	TiCN
Anticorrosion steel, series 400 and PH	23 - 61	0,025-0,038	0,038-0,064	0,064-0,089	TiCN
Grey iron	31 - 107	0,025-0,038	0,038-0,076	0,076-0,152	TiAIN
Ductile iron	23 - 107	0,025-0,038	0,038-0,076	0,076-0,152	TiAIN
Tempered iron	31 - 107	0,025-0,038	0,038-0,076	0,076-0,152	TiAIN
Nickel alloys	12 - 18	0,025-0,038	0,038-0,064	0,064-0,102	TiAIN
Titanium allots	31 - 40	0,025-0,038	0,038-0,076	0,076-0,127	TiCN
Cobalt alloys	12 - 18	0,025-0,038	0,038-0,064	0,064-0,102	TiAIN
Aluminium	182 - 610	0,025-0,038	0,051-0,114	0,114-0,254	TiCN
The recommended values are instructive for machining commencement. The machining depth must be identical with the tool diameter. Cooling shall be assured by a strong stream of the cooling medium.

Drill (mm)	Move (mm/speed)
2	0,04
4	0,06
6	0,09
8	0,12
10	0,15
12	0,18
16	0,19
20	0,22
25	0,26
The above specified values are general values only. They apply to dynamically stable machines using appropriate clamping systems. The tool run-out should not exceed 0.015 mm. For drilling depths over 5 x D the cutting speed must be reduced by 20%

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