Kickback; General Description Of The Machine; Machine Representations And Type Descriptions; Controls - Menzer LHS 225 AV Originalbetriebsanleitung

4.4 Kickback

Kickback is a sudden reaction to a jammed,
snagged or blocked insertable tool such as the
abrasive or the driving disc. The rotation of the
insertable tool is brought to a sudden halt by
this blocking action. As a counter-reaction this
accelerates the power tool against the rotational
direction of the insertable tool at the point where
the blocking takes place. E.g. if a sanding wheel
or the work piece snags or jams, the edge of the
sanding disc, which dips into the work piece, can
snag and break the sanding disc, or the Velcro
can let go or it can react with a kickback. The
sanding disc can jump towards the operator or
away from him, depending on the direction of rota-
tion of the sanding disc at the snag point. This can
also cause the sanding discs to break.
Kickback is the result of wrong or incorrect use
of the machine, incorrect working methods and/
or adverse operating conditions. The following
precautions minimize the risk of kickback:
• Hold the machine firmly with both hands and
place your arms and your body so that you have
maximum control over kickback forces and torque
reaction.
• Never position your hand near the rotating
insertable tools because they can kick back over
your hand.
• Both the operator and other persons, stay clear
from the area in which the power tool moves when
it kicks back as the machine accelerates against
the direction of rotation of the abrasive at the snag
point.
• Use extreme caution when working close to
corners and sharp edges, for instance, do not let
the power tool jump back or jam in these areas.
The consequences would be loss of control and
kickback.
8 EN

5. General description of the machine

5.1 Machine representations and type
descriptions (page *2*)
• LHS 225 AV
• LHS 225 VARIO AV
5.2 Controls (page *3*)
A: On/off button
B: Rotation speed control knob [MIN–MAX]
5.3 Starting off (page *4*–*9*)
Attention! The power plug has to be pulled
from the wall socket or not plugged in for all
the actions/operations described below!
a. Take the base unit (D) and separate main
tube (E) out of the packaging (1a. – refer to
page *4*).
b. Slide the main tube into the base unit to the
stop. Note the flattened and oval form of the
tube. (2a. – refer to page *4*.). Tighten the fix-
ing nut. (C) (3a. and 4a. – refer to page *5*).
c. Depending on the requirements, attach the ex-
tra handle (F) to one of the tubes of the machine.
(5a. and 6a. – refer to page *5*).
d. Attach a suitable abrasive to the sanding pad
on the driving disc of the machine (1b.–3b. – refer
to page *6*). Make sure that it is centred on the
disc.
Attention! To ensure that the working
environment is as dust free as possible, the
suction openings must match the openings of
the sanding pad (2b).
e. AV machines do not require a connected
industrial vacuum cleaner, as they have an
integrated extraction system. Only connect our
M-certified dust bag system to these machines
(refer to point 10 for Functional accessories and
peripherals).
For elevated sanding requirements (e.g.
high material removal rates) you can
connect a matching industrial vacuum cleaner to
your equipment using a simple push-fit system.
Follow the instructions in the images on page
*7* (1c. and 2c.) to connect an industrial vacuum
cleaner by means of the MENZER system. If
a MENZER universal adapter must be used in
between, follow the instructions on the pages *8*
and *9* (1d.–3d. to connect the adapter, 1e.–3e.
to connect an industrial vacuum cleaner to the
adapter). Make sure that a dust bag suitable
for fine dust is inserted in the industrial vacuum
cleaner beforehand.
f. Before connecting the device to the mains
outlet, ensure that the on/off switch is in position 0
(refer to page *3*). Then connect the plug on the
device to the mains outlet.

5.4 Settings and handling

(page *10*–*13*)
a. Hold the machine firmly and push the on/off
switch to position I (A – refer to page *3*). Expect
a rotational effect when you switch the machine
on.
b. Hold the long-neck sander with both hands on
the insulated gripping zones provided (G1–3) (1a.
– refer to page *10*). To vary the range, you can
mount the extra handle (F) in various positions on
the machine's tubes (2a. – refer to page *10*).
On the MENZER LHS 225 VARIO AV
models, the working length is freely
adjustable in the range of 1,550 to 1,950 mm. In
order to do so, loosen the fixing nut (C – 4a. – re-
fer to page *11*) until you can retract or extend the
extension tube (E VARIO – 5a. – refer to page
*11*). Now set the desired working length and
tighten the fixing nut (C) again (6a. – refer to page
*11*).
c. The rotation speed is continuously variable as
needed using the rotation speed control wheel
(B – see page *3*). This is also possible while
operating the machine. Higher speeds result in
higher removal rates, while slower speeds provide
more control over the sanding process.
d. Start the sanding process by carefully placing
the machine on the surface to be sanded.
Only apply enough pressure for the sanding
head to rest flat and flush on the surface.
Too much pressure can cause spiral scratch
patterns and bumps on the work surface and also
permanently damage the tool. We recommend a
circular, overlapping motion of the sanding head
on the work surface. The sander should stay in
motion until the desired smoothness has been
reached, as too long sanding in one spot can lead
to sanding marks.
EN 9