Standard Values For Speeds With Hss - Eco - Twist Drills - Optimum optimill MH25V Betriebsanleitung

OPTIMUM
M A S C H I N E N - G E R M A N Y
Tool diameter
[mm]
Form mills
4
5
6
8
10
12
14
16
4.11.2 Standard values for speeds with HSS – Eco – twist drills
Material
Steel, unalloyed,
2
up to 600 N/mm
Mild steel, alloyed, tempered,
2
up to 900N/mm
Mild steel, alloyed, tempered,
2
up to 1200 N/mm
Stainless steels up to 900 N/
2
mm
e.g. X5CrNi18 10

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.
GB MH25V
Page 72
Steel
15 - 24 m/min
1194 - 1911
955 - 1529
796 - 1274
597 - 955
478 - 764
398 - 637
341 - 546
299 - 478
Drill diameter
2 3 4 5
1)
n 5600 3550 2800 2240
2)
f 0.04 0.063 0.08 0.10
n 3150 2000 1600 1250
f 0.032 0.05 0.063 0.08
n 2500 1600 1250 1000
f" 0.032 0.04 0.05 0.063
n 2000 1250 1000 800
f 0.032 0.05 0.063 0.08
1): Speed [n] in rpm
2): Feed [f] in mm/rev
3): Cooling: E = Emulsion; oil = cutting oil
Original operating instructions
Grey cast iron
10 - 20 m/min ened 150 - 250
Speed [rpm]
796 - 1592 11900 - 19000
637 - 1274 9550 - 15900
531 - 1062 7900 - 13200
398 - 796
318 - 637
265 - 531
227 - 455
199 - 398
6 7 8 9
2000 1600 1400 1250 1120
0.125 0.125 0.16 0.16 0.20
1000 900 800 710 630
0.10 0.10 0.125 0.125 0.16
800 710 630 560 500
0.08 0.10 0.10 0.125 0.125
630 500 500 400 400
0.10 0.10 0.125 0.125 0.16
Al alloy
case-hard-
m/min
5900 - 9900
4700 - 7900
3900 - 6600
3400 - 5600
2900 - 4900
Cooling
3)
10
E
E/oil
Oil
Oil
Version 1.0.1 dated 2015-12-17