Operation
Version 1.0.2 - 2020-07-0726 Translation of original instructions
DP26
EN
DP26_GB.fm
4.10 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).
4.11 Drill chuck
ATTENTION!
Make sure that the clamped tool is firmly and correctly fitted.
4.11.1 Unfitting the drill chuck
The drill chuck and the taper mandrel are loosened from the drill spindle by means of a drill
drift.
PRECAUTIONARY MEASURE
Only disassemble the 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 superimposed.
Loosen the taper mandrel of the drill chuck with the
help of a drill drift.
Material
Drill diameter
Cooling
3)
2345678910
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
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