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OBJ_BUCH-1523-001.book Page 16 Monday, August 22, 2011 10:06 AM
Reversing the Rotational Direction
(see figure C)
The rotational direction switch 8 is used to reverse the
rotational direction of the machine. However, this is
not possible with the On/Off switch 9 actuated.
Right rotation: For driving in screws and tightening
nuts, press the rotational direction switch 8 through to
the left stop.
Left Rotation: For loosening and unscrewing screws
and nuts, press the rotational direction switch 8
through to the right stop.
Switching On and Off
To start the machine, press the On/Off switch 9 and
keep it pressed.
The power light 4 lights up when the On/Off switch 9
is slightly or completely pressed, and allows the work
area to be illuminated when lighting conditions are
insufficient.
To switch off the machine, release the On/Off switch
9.
Adjusting the Speed
The speed of the switched on power tool can be vari-
ably adjusted, depending on how far the On/Off
switch 9 is pressed.
Light pressure on the On/Off switch 9 results in a low
rotational speed. Further pressure on the switch
results in an increase in speed.
Battery Charge-control Indication
The battery charge-control indicator 10 consists of
three green LEDs, and indicates the charge condition
of the battery for a few seconds when the On/Off
switch 9 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 of 0–70 °C is
exceeded, the speed is reduced. The power tool will
not run at full speed until reaching the allowable bat-
tery temperature.
Protection Against Deep Discharging
The Li-ion battery is protected against deep discharg-
ing. When the battery is empty, the machine is
switched off by means of a protective circuit: The
inserted tool no longer rotates.
❏ Apply the power tool to the screw/nut only
when it is switched off. Rotating tool inserts can
slip off.
The torque depends on the impact duration. The max-
imum achieved torque results from the sum of all indi-
vidual torques achieved through impact. The
maximum torque is achieved after an impact duration
of 6–10 seconds. After this duration, the tightening
torque is increased only minimally.
The impact duration is to be determined for each
required tightening torque. The actually achieved
tightening torque is always to be checked with a
torque wrench.
Screw Applications with Hard,
Spring-loaded or Soft Seat
When in a test, the achieved torques in an impact
series are measured and transferred into a diagram,
resulting in the curve of a torque characteristic. The
height of the curve corresponds with the maximum
reachable torque, and the steepness indicates the
duration in which this is achieved.
A torque gradient depends on the following factors:
• Strength properties of the screws/nuts
• Type of backing (washer, disc spring, seal)
• Strength properties of the material being
screwed/bolted together
• Lubrication conditions at the screw/bolt connec-
Capacity
tion
≥ 2/3
The following application cases result accordingly:
• A hard seat is given for metal-to-metal screw
≥ 1/3
applications with the use of washers. After a rela-
< 1/3
tively short impact duration, the maximum torque
Reserve
is reached (steep characteristic curve). Unneces-
sary long impact duration only causes damage to
the machine.
• A spring-loaded seat is given for metal-to-
metal screw applications, however with the use of
spring washers, disc springs, studs or screws/nuts
with conical seat as well as when using extensions.
• A soft seat is given for screw applications, e. g.,
metal on wood or when using lead washers or
fibre washers as backing.
Working Advice
16
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