Operation
Version 1.0 2019-01-17
Page 53
Translation of the original instructions
B17Pro basic
GB
B17P
ro_b
asic_
G
B.
fm
OPTIMUM
M A S C H I N E N - G E R M A N Y
®
4.4
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).
4.5
Drill chuck
ATTENTION!
Make sure that the clamped tool is firmly and correctly fitted.
4.5.1
Dismounting the quick action drill chuck
The drill chuck and the taper mandrel are
loosened from the drill spindle by means of
a drill drift.
Img.4-1:
WARNING!
Only disassemble the quick-action drill chuck if the drilling machine is disconnected
from the electrical supply.
Disconnect the machine from the electrical supply.
Move the drill sleeve down.
Turn the drilling spindle until the openings of the sleeve and of the drilling spindle are super-
imposed.
Loosen the taper mandrel of the drill chuck with the help of a drill drift.
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
Drill sleeve
Drill drift
Upper part of quick-
action drill chuck
Bottom part of
quick-action drill
chuck
