Use Of The Unit - Mestra R-080490 Manual De Instrucciones

English
The R-080490 is a practical electrolytic
polisher especially designed for use in jewellery
work and dental mechanics. So that it may work
properly and perform polishing of high quality.
We recommend that you carefully read the
following instructions.
OPERATION
Any metal studied under the microscope exhibits
a more or less wrinkled surface, with projections
of every sort. If we put the same metal into an
electrolytic bath (fig. 1) and connect it to a
component with positive
(anode). there is a curious effect: the electrolyte
withdraws, giving rise to charged molecules,
called ions, that tear atoms off the surface of the
metal to combine with them. The resulting
particles have an electric charge, for which
reason, when they are submitted to the
difference in potential between cathode and
anode (fig. 5), there is a smooth displacement
toward the negative pole (cathode). The metal
particles are deposited on the cathode (fig. 3),
and there is again a charged ion that stars the
cycle off anew. The process comes to an end
when the electric flow is cut.
The parts of the metal surface on which there
appear the most pronounced projections are
those that have a large surface contact with the
electrolyte, hence those that lose most metal
atoms during polishing. In consequence, when
polishing is over the surface of the metal has
much less of an escarpment appearance (fig. 4),
with the rough edges smoothed down, so that
light can be reflected more homogeneously. The
metal is therefore brighter. The excess of metal
removed from the anode (+) ends up deposited
on the surface of the cathode.

USE OF THE UNIT

1. Position the apparatus on a surface that is
fiat, firm and fully horizontal. There are four
rubber feet on the base to ensure that it will
stay put.
2. Place the PVC tub (2) next to the unit. Fill
the tub with about 1.5 litres of electrolyte. Be
careful to ensure that the electrolyte is of
high quality, for in great measure the
efficiency of the polishing will depend on this
factor.
3. Connect the wiring between tub and unit. In
doing so you should take into account the
colour coding. BLACK corresponds to the
cathode and should be connected to the
6
GB
electric voltage
annular electrode at the back of the tub (3).
RED corresponds to the anode and should
be connected to the copper rod on top of the
tub (4).
4. To the tub anode, connect the metal parts
that you wish to polish. For this purpose, the
unit is supplied with a coil of silver-plated
copper wire. Cut a few small sections of wire
and use them to make hooks that will allow
you to hang, from the tub (copper red on the
top), the metal pieces that are to be
polished. Take care to ensure that the
electrical contact with this electrode is sound
and that the length of the hook allows, in
addition, the piece to be fully submerged in
the bath. Then close the tub cover (1).
5. Insert the plug into a 230V, 50/60 Hz outlet
with earth.
6. Start up the unit via the main switch on the
regulation timer (8). Check that the little pilot
light (6) goes on. Adjust the current of the
electrolytic bath
potentiometer. The
instantaneous current is shown on the
ammeter (5). To proceed with polishing, it is
advisable to use 0,5 amperes per cm of
metal surface. Since unit current should not
exceed 10 A, the surface for polishing
should never exceed 20 cm
the surface of a skeletal is usually between 6
2
and 10 cm . Ibis means a current between 3
and 5 amperes per skeletal, hence a
maximum of 2-3 skeletals per bath.
7. The unit has a practical timer (9). The period
over which the bath will function can
conveniently be set anywhere up to 30
minutes. If polishing is done according to the
specifications regarding
foregoing point, time should usually be
between 10 and 15 minutes. This aspect of
the matter will in any case depend on the
current chosen.
8. It is probable that during polishing the
electrolyte in the tub will heat up. This is
perfectly normal. Also it is possible that by
accident those pieces for polishing that are
positioned on the anode hooks touch the
annular cathode of the tub. When this occurs
there is a short circuit and the circuit breaker
(12) trips automatically.
cumstances, remove the pieces causing the
short circuit and wait three minutes before
resetting the circuit breaker.
by means of the
intensity of the
2
. For orientation,
current in the
In such cir-