Changing The Sanding Belt; Dust Extraction - Festool BS 75 Instrucciones De Servicio

3 Electronic adaptation of belt speed
on types BS 75 E
The control electronics permits the in-
fi nitely variable adaptation of the belt
speed.
Setting of set
wheel
1
2
3
4
5
6
The most suitable belt speed must be found
by trial and error when starting work, because
there are several prime factors which infl uence
the choice, such as the surface and quality of
the workpiece, the make of abrasive belt and
grit, skill of the operator etc.
The fi gures shown in the table are only recom-
mended values.
Application Setting of
set whee
Solid wood,
fi ne
Veneer
Chipboard
Plastics
Steel
Paint remova
The belt speed is infi nitely adjustable up to the
maximum setting while work is in process.
This is done by turning the set wheel (2.1).
It must be remembered that at low speed set-
tings the sander has a lower power output. In
order to avoid overloading, therefore, the speed
has to be increased by turning the set wheel
if it turns out that the belt speed falls sharply
while working.
4 Operation
Only to be switched on when the machine is
raised. Using the lock on button (1.2), the
switch (1.3) can be locked in the ON position.
Before sanding, check the alignment of the belt
and if necessary, adjust by turning the adjus-
ting knob (1.4) until the belt is fl ush with the
outside edge of the sanding face.
Using both hands, place the machine straight
onto the workpiece to be sanded.
The actual weight of the machine provides
adequate sanding pressure to produce good
Belt speed
(no-load)
200 m/min
240 m/min
300 m/min
340 m/min
360 m/min
380 m/min
Grit
4 - 6 100
3 - 4 120
5 - 6 100
1 - 4 100
2 - 4 80
1 - 3 24
sanding quality.
The expelled cooling air can be guided in the
most favourable direction by the ducting fl ap
(1.1) .
4.1 Working with the sanding frame in
the case of type BS 75 E - Set
Set the machine with the knurled head screw
(2.4), so that when it is placed on the workpiece
surface the sanding belt does not engage.
The sanding belt is engaged by turning the
knurled head screw towards the plus symbol
until the belt makes contact.
Continue turning the knurled screw to achieve
the desired depth of stock removal (1 comple-
te turn corresponds to a height adjustment of
0.4 mm).
When interrupting or on completing work, the
sander is raised from the working position (2.3)
set to a position of rest (2.2) by means of an
eccentric lever.
By swinging the eccentric lever back to wor-
king position the depth of stock removal set
previously is again obtained.
4.2 Taking the sanding frame off
Press down the knurled head screw (2.4) until
the shank (2.5) springs out of the spring catch
and the machine can be withdrawn from the
rear.
The sander and sanding frame are alig-
ned for optimum accuracy at the factory
by suitable adjustment of the guiding
struts.
For this reason do not remove the gui-
ding struts.
4.3 Assembling the sanding frame
Make sure that the glide pins (2.6, 2.8) fi xed
to the sanding frame engage front and back in
the grooves of the guide struts (2.7, 2.9).
Slide the sander downwards along the grooves
until the shank (2.5) engages.
4.4

Changing the sanding belt

Pull the lever (3.5) forward; the belt is now
slack and can be removed.
When fi tting a new belt, take special care to
ensure that the arrow on the inside of the belt
points in the same direction as that on the
sander (3.4).
Tighten the belt again with the lever and align
when running.
4.5

Dust extraction

The dust produced while working can be
detrimental to health, combustible or
explosive. Suitable safety measures are
necessary.
The dust bag (4.1) with the adopter (4.3) is
attached to the exhaust duct (4.2) by means
of a bayonet catch by turning to the right.
The dust bag is removed for emptying by tur-
8