T50
-11-
OPERATION
Switch Operation
■
This switch has a built-in, electronic circuit
that can vary the rotation speed.
Consequently, when the switch trigger is
squeezed only slightly (low speed rotation)
and the motor is stopped while continuously
driving in screws, the components of the
electronic circuit parts may overheat and be
damaged.
■
To turn the tool on, squeeze the trigger
switch. To turn the tool off, release the trigger
switch.
■
Your tool is equipped with a brake. The tool
will stop as soon as the trigger switch is fully
released. The farther you squeeze the
trigger, the faster the tool will operate.
Screwdriving Operation
■
Rest the tool after continuous work.
■
After use for continuous bolt-tightening work,
rest the unit for 15 minutes or so, when
replacing the battery. The temperature of the
motor, switch, etc., will rise if the work is
started again immediately after battery
replacement, eventually resulting in burnout.
■
Place the point of the driver bit in the screw
head. Keep the tool pointed straight at the
screw.
■
Apply forward pressure to the tool to prevent
the bit from slipping off the screw.
■
Turn the unit on to start operation. Always
check torque with a torque wrench, as the
fastening torque is affected by many factors
including the following:-
1. Voltage:
Low voltage, due to a nearly
discharged battery, will reduce the fastening
torque.
2. Bit or socket size:
Failure to use the
correct bit or socket size will cause a
reduction in fastening torque.
3. Variable Speed Trigger Switch:
Operating the tool at a reduced speed will
reduce the fastening torque.
4. Bolt Size:
Larger bolt diameters generally
require higher fastening torque. Fastening
torque will also vary according to length,
grade, and torque coefficient.
5. Material:
The type of material and surface
finish of the material will affect fastening
torque.
6. Fastening Time:
Longer fastening time
results in increased fastening torque. Using
a longer fastening time than recommended
could cause the screws to be overstressed,
stripped or damaged.
Do not touch the metal front cover
assembly, as it gets very hot during
continuous work.
Tightening Torque
Reference values for the proper fastening
torque, based on a standard bolt and resist high
tension bolt is shown below:-
■
Tightening torque will vary according to
tightening conditions.
If a long striking time is used, screws will be
strongly tightened. This may cause the screw to
break, or may damage the end of the bit. If the
unit is held at an angle to the screw being
tightened, the head of the screw may be
damaged, or the specified torque may not be
transmitted to the screw. Always keep the unit
and the screw being tightened in a straight line.
204
1.0
2.0
3.0
408
612
816
Tightening Time
Sec
M8
M10
M12
(M12)
(M10)
(M8)
Kgf/mm
Standard Bolt
Tightening Torque Allowed
Resist High Tensile Bolt
Tightening Torque Allowed
Tightening
Torque
204
1.0
2.0
3.0
408
612
816
Tightening Time
Sec
M8
M10
(M10)
(M8)
Kgf/mm
Tightening
Torque
MANU-T50 v1.0 6/11/06 2:14 pm Page 11