Kress Elektrowerkzeuge 800 SX Mode D'emploi page 8

Changing direction of rotation
(main rotation – clockwise)
The direction of rotation of the spindle is altered by the re-
versing switch (3).
R = Clockwise (Right)
L = Anticlockwise (Left)
Important! Press the rotational direction switch 9 in
each case to the stop on the housing, i. e. until it can
be felt to engage.
The reversing switch is easiest to operate by using the
thumb and index or middle finger from both sides.
Attention!
Change direction of rotation only when the motor has
ceased turning!
When using the drill as a screwdriver, the percussion
mechanism must be switched off. Switch-over by
means of the sliding switch (5).
When fixed in the middle LOCK position, the reversing
switch prevents accidental startup of the full wave con-
trol (1), for example when changing tools or mount-
ing/removing the drill chuck.
Percussion drilling device
The machine has an integrated percussion mechanism and
can be switched from normal drilling to percussion drilling.
The sliding switch (5) allows switching from normal drilling
to percussion drilling or vice-versa while the machine is in
operation.
Normal drilling position
Push slide switch (5) to the left in direction of "normal drill-
ing".
Percussion drilling position
Push slide switch (5) to the right in direction of "percussion
drilling".
Mechanical two-speed gearshift
Shifting takes place by turning the finger-grip knob (6) on
the upper side of the machine.
Position 1 = slow machine speed
Position 2 = fast machine speed
The two-speed gearing offers advantages for drilling and
percussion drilling with small drill diameters up to c. 8 mm
(shift gear to position 2). For larger drill diameters and for
mixing work, shift gear to position 1.
The LOCK function (finger-grip knob (6) in LOCK position)
is useful when mounting and removing the drill chuck. The
LOCK position also facilitates wrench-free tool changes
when using a quick-change chuck and allows maximum
clamping force in tool mounting.
Safety slip coupling
The slip coupling takes effect as soon as a tool clamped in
the machine becomes overloaded, is braked abruptly or
jams. Although the motor and gear continue to run, the tool
remains stationary. Thus, the motor and gear are protected
against overload, impulsive gearwheel loading is ruled out.
Quick-change chuck
This chuck has been specially developed for use on per-
cussion drills.
The chuck has a release safety lock which prevents any
unintentional release of drilling tool even at high impact fre-
quencies.
Operation by turning collar as usual to stop point. Engage-
ment of clamping force safety lock for subsequent opera-
tion is clearly heard and felt.
Clamping and releasing of chuck by holding the locking
ring.
Use as a screwdriver
Screwdriver inserts (bits) can fitted directly into the chuck.
Use Phillips screws for best results. Safe operation is en-
sured by the self-centering mechanism. Please make sure
to use the correct screwdriver inserts.
Cutting threads
The integrated electronic and the reversal of the direction
of rotation makes the percussion drill also suitable for cutt-
ing threads. The use of machine taps is recommended.
The tap is clamped into the chuck. The electronic controls
are sensitive and should be handled with utmost care to
prevent any breaking of tap – particularly when cutting
threads into blind holes.
The required torque may be selected via the adjusting
wheel in switch (1) and via the torque selection (4).
Important! When cutting threads, use low speeds only.
Important note for machines with clockwise and anti-
clockwise rotation.
Reassembly of drill chuck:
Caution!
Before disassembling and reassembling the drill chuck,
disconnect the machine from the power supply, or re-
move the mains cable module (6) from the grip using
the locking device button (7).
Caution!
Before removing and mounting the drill chuck, always
move the reversing switch (3) to the LOCK position. By
doing so, you eliminate the risk of accidentally trigger-
ing the full wave switch (1).
If a faulty chuck has to be replaced, please check whether
the chuck is secured to the drill spindle with a safety
screw. This screw must be removed first (Attention! Left-
handed screw! Turn clockwise!).
The chuck can be loosened and unscrewed by lightly hit-
ting a hexagon socket key (Allen key) which has been fitted
in the chuck. It is refitted by repeating the procedure back-
wards.
Caution: Before fitting a new chuck please clean the end
faces on the chuck and drill spindle.
Tighten the new chuck securely (30 Nm). Secure the chuck
with the safety screw is there is one (Tighten the safety
screw in anti-clockwise direction).
Caution!
It is still possible, especially when there is no safety
screw, that the chuck comes off the drill spindle when
it is turning in the anticlockwise direction. For this rea-
son, when changing the chuck ensure that it is fitted
onto the spindle perfectly.
Always make sure that the chosen speed is correct for
the purpose for which you are using the machine.
High speeds are necessary for polishing and grinding.
When drilling match speed with type of material and drill.
High speed drilling in steel and stone will cause premature
tool wear.
Use tool steel twist drills for soft materials such as wood
and plastics; carbide-tipped stone drills for stone and con-
crete; high speed twist drills for steel and iron.
Also make sure that, using a gear-rim-chuck, the drill
chuck key is never fastened to the drill with chains,
strings or by similar means. Be sure that the workpiece
cannot be taken along by the drill.