
B–70115EN/03
11. LASER OPTICAL SYSTEM
362
The oscillators of the short optical path types and the C3000C of long
optical path type contain a beam folding unit to divert the laser beam
within the oscillator. If the beam output direction changes as a result of
aligning the resonator, the beam folding unit must be adjusted.
The first mirror to reflect the laser beam from the output mirror is fixed
and not movable. The second mirror is movable.
The movable mirror holder has adjustment screws for inclining the mirror
horizontally and vertically, or adjustment screws for inclining the mirror
to the right and to the left. Never touch the fulcrum screw. This fulcrum
is used to adjust the space between the holder and support to 3 mm.
First, adjust the beam so that it does not interfere with the resonator
folding block and duct. This adjustment allows the beam to be output
from almost the center of the oscillator outlet.
Perform adjustment by following the procedure given below.
(1)Insert a target in the hole of the resonator folding block or circulating
pipe. If a target is not available, attach wires to indicate the center of
the hole.
(2)Place an acrylic plate at the oscillator outlet, and blow air across it,
using a dryer, for example.
(3)Start the oscillator to ready it for laser output.
(4)Execute a program to output a laser beam of the rated output, CW
100%, and 0.1 second duration. Then, a mark like that of the target
(crisscross) will appear on the acrylic plate.
[Sample program]
G32 P1 Q1 ;
G24 S*** Q100 R0.1 ;
G32 P0 ;
(5)While referencing the mark, turn the adjustment screws on the holder
so that the beam center is aligned with the intersection of the crisscross
mark.
(6)Repeat steps (4) and (5) until the beam center is aligned with the
crisscross mark.
Next, adjust the oscillator or bend mirror of the machine tool by
moving it so that the beam strikes the center of the bend mirror. When
this adjustment has been performed at installation, it subsequently
need not be performed.
11.2.3
Alignment of the Beam
Folding Unit