Mestra GALAXY Manual Del Usario página 7

The Galaxy R-080235 is an automatic sand
blaster specially designed for sandblasting small
pieces within the field of dental prosthesis on
continuous automatic mode or ion manual mode. In
order to achieve an optimal operation and
performance of the unit, we strongly recommend
you to read carefully the following instructions:
INSTALLATION
• Carefully unpack the unit. You will find the
following accessories inside the cabin:
- A Ø 4 / 6 mm pipe to connect the unit to the
air supply.
- A 90º PVC elbow to be fitted into the outlet
aspiration hose.
- Two plastic covers to protect the glass (R-
080235-50).
- A basket.
• Choose a firm, flat surface to place the unit, far
from heat or vibration sources. The room
atmosphere should never be damp. An excess
of humidity could compact the aluminium oxide
particles inside the cabin and, therefore, obstruct
the blasting nozzles. Finally, place the unit at a
height that allows an easy manipulation of the
objects inside the cabin.
• Fit the connecting pipe supplied with the unit into
the inlet adaptor (E) placed at the right side
panel of the machine. The other end should be
fitted into an intake of pressured air fed by a
compressor with a minimum pressure of 7 bar
(0.7 MPa) and a minimum flow of 100
litre/minute.
• Connect the power cord to a grounded 230 V,
50/60 Hz power source.
• Fill the hopper in the cabin with aluminium oxide
of a maximum diameter of 300 micron. To obtain
a maximum autonomy, load the hopper up to a
maximum height of 2 cm below the tray.
NOTE: the unit is optimized for 200 micron
particles and getting an stable jet. With smaller
particle diameters (100 microns) the jet may be
more irregular.
• The unit is factory supplied with a 3 mm
boron carbide nozzle (R-080235-25), material
much more abrasion-resistant than the
traditional tungsten.
PRESSURE REGULATION
The blowing pressure of the blasting gun can be
regulated at will between 2 and 5 bar (0.2 and 0.5
MPa), according to the nature and special features
GB
of the work to be done. Take into account that the
highest pressure will be limited by the maximum
pressure of the air supply we are using. In any
case, the pressure should never be higher than 6
bar (0.6 MPa).
The unit features a pressure regulation valve (G) to
select the working pressure easily. To adjust the
pressure pull the valve outwards and turn it until the
intended pressure has been reached. The value of
the pressure is shown in the built-in pressure
gauge (H). After adjusting the pressure, block the
valve knob by pressing it inwards.
The pressure gauge shows the gun's blowing
pressure at any time, even when the gun is not
being used.
CONNECTING TO THE ASPIRATION UNIT
The blasting cabin should always be used
connected to a pressured aspiration unit. For this
purpose there is an outlet hose on the upper left
side panel of the unit. The aspiration unit to be
used has to create a light depression inside the
cabin for the dust particles to circulate smoothly
and continuously towards the outlet hose.
NOTE: make sure that the aspiration unit used
can suck abrasive particles. We strongly
recommend the MESTRA Eolo Plus R-080531
aspiration unit.
The factory-supplied PVC elbow can be adapted
according to the needs and shape of the pressured
aspiration unit to be used.
OPERATION
The Galaxy R-080235 automatic sandblaster can
be operated on automatic or manual mode.
Automatic mode:
1. Fit the basket (B) into the motor shaft (Fig. 1).
Never force the motor shaft to rotate by hand,
whether the basket is fitted or not. The motor's
inner mechanism could be damaged.
2. Put the pieces you want to sandblast inside the
basket.
3. Position the gun (A) facing the pieces, bearing
in mind that the basket will rotate clockwise. At
the beginning the motor may start to rotate anti-
clockwise, but before completing its first turn it
will start to rotate clockwise.
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