Working Advice - BTI A-BS 12 V Manual Original

OBJ_BUCH-3429-001.book Page 30 Friday, December 15, 2017 4:05 PM
Reversing the rotational direction (see figure C)
The rotational direction switch 6 is used to reverse
the rotational direction of the machine. However,
this is not possible with the On/Off switch 7 actuat-
ed.
Right Rotation: For drilling and driving in screws,
push the rotational direction switch 6 left to the
stop.
Left Rotation: For loosening and unscrewing
screws and nuts, press the rotational direction
switch 6 through to the right stop.
Setting the torque
With the torque presetting ring 2 the required
torque setting can be preselected in 20 steps. With
the correct setting, the insert tool is stopped as
soon as the screw is screwed flush into the material
or when the adjusted torque is reached. The safety
clutch is deactivated in the " " position, e. g. for
drilling.
Select a higher setting or switch to the
" " symbol when unscrewing screws.
Gear selection, mechanical
 Actuate the gear selector 3 only when the ma-
chine is at a standstill.
Two speed ranges can be preselected with the
gear selector 3.
Gear I:
Low speed range; for screwdriving or working with
large drilling diameter.
Gear II:
High speed range; for working with small drilling di-
ameter.
If the gear selector 3 cannot be pushed through to
the stop, lightly turn the drill chuck with drill bit.
Switching On and Off
To start the machine, press the On/Off switch 7
and keep it pressed.
The power light 9 lights up when the On/Off switch
7 is slightly or completely pressed, and allows the
work area to be illuminated when lighting condi-
tions are insufficient.
To switch off the machine, release the On/Off
switch 7.
Adjusting the Speed
The speed of the switched-on power tool can be
variably adjusted, depending on how far the On/Off
switch 7 is pressed.
Light pressure on the On/Off switch 7 results in a
low rotational speed. Further pressure on the
switch results in an increase in speed.
Fully automatic spindle locking (Auto-lock)
When the On/Off switch 7 is not pressed, the drill
spindle and thus the tool holder are locked.
This enables screws to be screwed in, even when
the battery is empty and allows for the machine to
be used as a screwdriver.
30 | English
Run-on Brake
When the On/Off switch 7 is released, the chuck
brakes to a stop, thus preventing the run-on of the
tool.
When driving in screws, wait until the screw is
screwed in flush with the material and then release
the On/Off switch 7. By doing so, the head of the
screw does not penetrate into the material.
Battery Charge-control Indication
The battery charge-control indicator 8 consists of
three green LEDs, and indicates the charge condi-
tion of the battery for a few seconds when the
On/Off switch 7 is pressed halfway or fully.
LED
Continuous lighting 3 x green
Continuous lighting 2 x green
Continuous lighting 1 x green
Flashing light 1 x green
Temperature Dependent Overload Protection
When using as intended for, the power tool cannot
be subject to overload. When the load is too high
or the allowable battery temperature range is ex-
ceeded, the speed is reduced. The power tool will
not run at full speed until reaching the allowable
battery temperature.

Working Advice

 Apply the power tool to the screw only when it
is switched off. Rotating tool inserts can slip off.
Tips
After longer periods of working at low speed, allow
the machine to cool down by running it for approx.
3 minutes at maximum speed with no load.
For drilling in metal, use only perfectly sharpened
HSS drill bits (HSS=high-speed steel). The appro-
priate quality is guaranteed by the BTI accessories
program.
Before screwing larger, longer screws into hard
materials, it is advisable to predrill a pilot hole with
the core diameter of the thread to approx.
screw length.
Capacity
≥ 2/3
≥ 1/3
< 1/3
Reserve
2
/ of the
3
1 609 92A 497 • 15.12.17