OPTIMUM
M A S C H I N E N - G E R M A N Y
Version 1.0.1 dated 2015-12-17
Page 72
Original operating instructions
MH25V
GB
4.11.2 Standard values for speeds with HSS – Eco – twist drills
The above data are standard values. In some cases it may be advantageous to increase or
decrease these values.
A cooling or lubricating agent should be used when drilling.
For stainless materials (e.g. VA – or NIRO steel sheets) do not centre, as this will result in
the material compacting and the drill bit rapidly becoming blunt.
The workpieces need to be tensed inflexibly and stably (vice, screw clamp).
INFORMATION
Friction during the cutting process causes high temperatures at the cutting edge of the tool. The
tool should be cooled during the milling process. Cooling the tool with a suitable cooling lubri-
cant ensures better working results and a longer edge life of the cutting tool.
Tool diameter
[mm]
Form mills
Steel
15 - 24 m/min
Grey cast iron
10 - 20 m/min
Al alloy
case-hard-
ened 150 - 250
m/min
Speed [rpm]
4
1194 - 1911
796 - 1592
11900 - 19000
5
955 - 1529
637 - 1274
9550 - 15900
6
796 - 1274
531 - 1062
7900 - 13200
8
597 - 955
398 - 796
5900 - 9900
10
478 - 764
318 - 637
4700 - 7900
12
398 - 637
265 - 531
3900 - 6600
14
341 - 546
227 - 455
3400 - 5600
16
299 - 478
199 - 398
2900 - 4900
Material
Drill diameter
Cooling
3)
2
3
4
5
6
7
8
9
10
Steel, unalloyed,
up to 600 N/mm
2
n
1)
5600
3550
2800
2240
2000
1600
1400
1250
1120
E
f
2)
0.04
0.063
0.08
0.10
0.125 0.125
0.16
0.16
0.20
Mild steel, alloyed, tempered,
up to 900N/mm
2
n
3150
2000
1600
1250
1000
900
800
710
630
E/oil
f
0.032
0.05
0.063
0.08
0.10
0.10
0.125 0.125
0.16
Mild steel, alloyed, tempered,
up to 1200 N/mm
2
n
2500
1600
1250
1000
800
710
630
560
500
Oil
f"
0.032
0.04
0.05
0.063
0.08
0.10
0.10
0.125 0.125
Stainless steels up to 900 N/
mm
2
e.g. X5CrNi18 10
n
2000
1250
1000
800
630
500
500
400
400
Oil
f
0.032
0.05
0.063
0.08
0.10
0.10
0.125 0.125
0.16
1): Speed [n] in rpm
2): Feed [f] in mm/rev
3): Cooling: E = Emulsion; oil = cutting oil
