Femi 404 Instrucciones Para El Uso Y Manutencion página 13

3.2 REPLACING THE GRINDING WHEEL
(pictures 2-5-6)
WARNING: Prior to performing any
maintenance operation, disconnect the
electric power supply.
Activate switch 2 to stop the machine and wait
until the grinding wheels have stopped completely.
Take away parts 7 and 6.
Remove cover 14 from the safety cap, unscrewing
the relevant screws.
With an open key unscrew the nut 15 and keep the
shaft steady through an hexagonal key, keeping in
mind that on the left side it has a left-handed
threading, and therefore it is unscrewed in
clockwise direction.
Replace worn out grinding wheel with a new one.
Check if a new grinding wheel is integral
Before mounting the new grinding wheel, it is
advisable to perform a sound test in order to check
its integrity.
To carry out this test, the grinding wheels must be
dry and clean, otherwise the emitted sound could
result dampened. With the help of a non-metallic
tool (wooden handle of a screwdriver or a wooden
mallet), lightly strike the grinding wheel on its side
(picture 5): a light strike against an integral grinding
wheel produces a pleasant and clear sound.
If, on the other hand, the emitted sound is dull or
cracked, the grinding wheel should not be used.
Retighten 15 screw nut.
Reassemble cover 14 of the safety cap.
Re-assemble the pieces that were taken off
previously.
If the radial and axial movement of the rotating
grinding wheel, gauged both on the circumference
and on the side wall of the grinding wheel
respectively, should be too much, the grinding wheel
produces excessive vibration when used at
maximum rotating capacity.
In order to decrease such value, stop the machine,
loosen the grinding wheel and turn it on its axis by
1/4 turn holding the motor shaft firmly, then lock the
grinding wheel. If the problem persists, repeat the
operation as many times as required until the best
possible position is found.
3.3 USE OF THE BRUSH (Fig. 7)
The right-hand part of the combined bench grinder
is manufactured so that it can house a brush for
the cleaning or polishing of various types of metals.
It is possible to fit metal wire brushes (cleaning) or
cloth/fabric brushes (polishing) with varying
maximum diameter, maximum width and stop collar
hole, depending on the model (refer to the "USE OF
APPROPRIATE TOOLINGS" table).
Ensure that the diameter of the middle collar 16 that
keeps the wires together is always greater than
the diameter of the fastening flanges 17 provided
on the machine.
WARNING: It is prohibited to secure the
brushes with the flanges in direct
contact with the wires.
Every now and then check the general condition of
the brush by visually inspecting it, especially as
concerns the hold of the wires, by means of the
middle collar. If you notice that the collar does not
close perfectly any more, replace the brush with a
new one at once.
WARNING: Prior to performing any
maintenance operation, disconnect the
electric power supply.
Fitting of the brush
Ensure that the machine is OFF and that the toolings
provided (e.g. grinding wheels) are perfectly still.
Use an Allen wrench to unscrew the screw nut 18
that locks the flanges to the shaft.
Remove the tightening flange 17 from its seat.
Fit the brush onto the shaft, ensuring that the hole
of the brush has the same diameter of the shaft or
of the adapting bush provided onto which it is
secured.
Re-position the tightening flange 17 onto the shaft
making it touch the collar 16 of the brush.
Remove the middle side plug 19 from the protection
and introduce a socket wrench through the hole
until the seat is properly fit on the shaft 20.
At this point, keeping the shaft locked by means of
the socket wrench, tighten the fastening screw
nut on the flanges.
Try to turn the brush by hand to make sure that it is
centered. If it does not turn properly, repeat the
aforesaid steps.
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