OPTIMUM
M A S C H I N E N - G E R M A N Y
20
12
Operation
Version 1.0.1 dated 30 / 08 / 2012
Page 30
Original operating instructions
MH28V
GB
4.8.2 Standard values for speeds with HSS – Eco – twist drilling
•
The above mentioned indications are standard values. In some cases it may be advanta-
geous to increase or decrease these values.
•
When drilling, a cooling or lubricating agent should be used.
•
For stainless materials (e.g. VA – or NIRO steel sheets) do not center since the material
would compact and the drill bit will become rapidly blunt.
•
The workpieces need to be tensed in flexibly 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
lubricant ensures better working results and a longer edge life of the cutting tool.
65
49 - 122
49 - 108
735 - 1715
Tool diameter
[ mm ]
form cutters
Steel
15 - 24 m/min
Grey cast iron
10 - 20 m/min
Age-
hardened
Al alloy 150 -
250
m/min
Speed [
min
-1
]
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
Cutter 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
Structural steel, alloyed,
quenched and subsequently
drawn, 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
Structural steel, alloyed,
quenched and subsequently
drawn, 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 r/min
2): Feed [ f ] in mm/r
3): Cooling: E = emulsion; Oil = cutting oil