
7.UNITS B-70315EN/02
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7.14 BEAM ABSORBER
7.14.1 Replacement Method
(1) Turn off the power to the CNC, then turn off the main circuit
breaker and power supply for the laser oscillator. Turn off the
power to the chiller unit.
(2) Drain the water from the oscillator, then disconnect the water
pipes.
(3) Disconnect the temperature sensor Faston terminal.
(4) Remove the bolts, then remove the absorber. Before removing
the absorber, mark the position of the absorber or mounting
metal bracket. If the position of the absorber is shifted as a result
of the replacement, the laser beam is not directed to the center of
the absorber. In such a case, the absorber must be adjusted.
(5) Mount a new absorber, aligning it with the marked position.
(6) Connect the water tubes and temperature sensor cable.
(7) Operate the chiller unit manually to circulate the cooling water.
Check that no water leaks from the fittings that were
disconnected during the replacement. After checking, restore the
original chiller setting.
(8) Start the oscillator, and check the absorber position as described
in the next subsection.
7.14.2 Adjusting the Position
(1) Draw a cross on an acrylic plate, then fix the plate such that the
center of the cross is aligned with the center of the absorber
aperture.
(2) Provide a flow of cooling air to the acrylic plate, using a drier,
for example.
(3) Start the oscillator, and turn on the discharge start switch
(HVON). As soon as the output starts increasing on the output
display screen, turn off the discharge start switch (HVOFF).
Laser oscillation starts, and a round beam mark is left on the
acrylic plate.
(4) Adjust the absorber such that the mark on the acrylic plate is
aligned with the center of the absorber.
(5) Repeat step (3), then check the position of the absorber. If the
mark is still not aligned with the center of the absorber, adjust the
absorber again.
(6) In step (3), soot from the burnt acrylic plate may adhere to the
shutter mirror. Check whether the shutter mirror has been
contaminated with soot or other particles, and clean the mirror if
necessary.