Operation
Version 1.0.1 - 2021-07-06
75
Translation of original instruction
DH 40CT
EN
D
H
4
0
CT_GB_
4.
fm
Safety during operation on page 64
4.3
Switching on the machine
ATTENTION!
Wait until the drilling milling machine has come to a complete halt before changing the
rotation direction using the rotation direction switch.
Switch on the master switch.
Close the protective device.
Select the rotation direction of the drilling milling machine using the rotation direction switch.
Two speed stages are available for each rotation direction.
The marking "R" means clockwise rotation.
The marking "L" means anticlockwise rotation.
Press the button "ON". The drilling milling machine switches on and turns in the preselected
rotation direction.
4.3.1
Switching off the machine
CAUTION!
Only press the emergency stop button in a genuine emergency. You should not use the
emergency-stop button to stop the machine during normal operation.
The life time of the emergency stop impact switch is not designed for operational shut-
down of the machine.
4.4
Feed for milling
with the hand cranks on the cross table.
Note the different forces acting during synchronous milling and conventional milling on the spin-
dles of the milling table. The cutting forces during synchronous milling tend to be that the tool
will move into the material.
Conventional milling is always to be preferred over synchronous milling.
Only with recirculating ball screws can the use of synchronous milling be undertaken sensibly.
This instruction manual assumes that the drilling milling machine has been obtained without
recirculating ball screws.
The forces and backlash occurring in the spindle nuts leads to "chatter marks" on the surface of
the work piece in synchronous milling.
In conventional milling, the work piece moves with the hand cranks on the milling table oppo-
site to the direction of rotation of the milling machine.
In synchronous milling, the work piece moves with the hand cranks on the milling table in the
direction of rotation of the milling machine. A smoother surface is obtained compared with con-
ventional milling. So, machining in synchronous milling should only be used for finishing.
4.5
Speed setting
4.5.1
Selecting the speed
The correct speed is an important factor for milling. The speed determines the cutting speed by
which the cutting edges cut the material. The service life of the tool can be increased and the
working result optimized by selecting the correct cutting speed.
The ideal cutting speed basically depends on the workpiece and the tool material. Higher
speeds are possible with tools (mills) made from hard metal or cutting ceramics than with tools
