4 Commissioning
© Precitec GmbH & Co. KG • EN 09/2019
4 - 37
4.2.2
Setting the focal position
Fig. 4-2
Commissioning: Laser beam - Focal position
Changing the focal position
Use the adjusting screw
(1)
to adjust the head vertically. The adjustment range
can be read on the scale.
Adjustment range
Adjustment range:
+3 to -5 mm
(all focal lengths)
(scaled dial with 0.5 mm graduation)
Nominal focal position:
1 mm in front of the nozzle tip
(view from the outside onto the nozzle tip)
When adjusting the focal position, the system must not be under pressure
(no cutting gas)
and the distance controller must be switched off.
1
Adjusting screw, vertical adjustment
–5 mm
+3 mm
1 mm
1
(size 5)
LC-
BA-oT
cp
Modify the focal position.
Turn the adjusting screw
(1)
using the Allen key
(size 5)
and centre the laser head's focal
position correctly.
The zero mark on the scaled dial stands for the lens' theoretical zero position
with a focal point of 1 mm below the nozzle
(DE)
.
Typically, focusing lenses are manufactured with a maximum nominal focal
length tolerance of ± 1%
(according to the manufacturer's specifications)
. As a result,
the adjustment range can be limited. The focal position can thus vary
depending on the lens. This must be taken into consideration when carrying
out any adjustment.
