Makita BCS550 Manual De Instrucciones página 303

OPERATION
012050
The proper fastening torque may differ depending upon
the kind or size of the screw/bolt, the material of the
workpiece to be fastened, etc. The relation between
fastening torque and fastening time is shown in the
figures.
Standard bolt
N m
(kgf cm)
120
(1224)
100
(1020)
80
(816)
M12
60
(612)
M10
40
(408)
M8
20
(204)
0 1.0 2.0
Fastening time (S)
006255
High tensile bolt
N m
(kgf cm)
120
M12
(1224)
100
(1020)
80
(816)
60
(612)
M8
40
(408)
20
(204)
0 1.0 2.0
Fastening time (S)
006257
M14
(M14)
(M12)
(M10)
(M8)
3.0
(M12)
M10
(M10)
(M8)
3.0
Hold the tool firmly and place the point of the driver bit in
the screw head. Apply forward pressure to the tool to the
extent that the bit will not slip off the screw and turn the
tool on to start operation.
NOTE:
Use the proper bit for the head of the screw/bolt
•
that you wish to use.
When fastening screw M8 or smaller, carefully
•
adjust pressure on the switch trigger so that the
screw is not damaged.
Hold the tool pointed straight at the screw.
•
If you tighten the screw for a time longer than
•
shown in the figures, the screw or the point of the
driver bit may be overstressed, stripped, damaged,
etc. Before starting your job, always perform a test
operation to determine the proper fastening time for
your screw.
If you use a spare battery to continue the operation,
•
rest the tool at least 15 min.
The fastening torque is affected by a wide variety of
factors including the following. After fastening, always
check the torque with a torque wrench.
1. When the battery cartridge is discharged almost
completely, voltage will drop and the fastening
torque will be reduced.
2. Driver bit or socket bit
Failure to use the correct size driver bit or socket
bit will cause a reduction in the fastening torque.
3. Bolt
Even though the torque coefficient and the
•
class of bolt are the same, the proper fastening
torque will differ according to the diameter of
bolt.
Even though the diameters of bolts are the
•
same, the proper fastening torque will differ
according to the torque coefficient, the class of
bolt and the bolt length.
4. The manner of holding the tool or the material of
driving position to be fastened will affect the torque.
5. Operating the tool at low speed will cause a
reduction in the fastening torque.
MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and the
•
battery cartridge is removed before attempting to
perform inspection or maintenance.
Never use gasoline, benzine, thinner, alcohol or the
•
like. Discoloration, deformation or cracks may
result.
7