Makita 6953 Manual De Instrucciones página 5

OPERATION
The proper fastening torque may differ depending upon
the kind or size of the 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
(ft·lbs)
140
(100)
120
(86)
100
M14 (9/16")
(72)
80
M12 (1/2")
(58)
60
(43)
40
(29)
20
(14)
0
1
Fastening time
High tensile bolt
N·m
(ft·lbs)
140
(100)
120
(86)
100
(72)
M10 (3/8")
80
(58)
60
(43)
M8 (5/16")
40
(29)
20
(14)
0
1
Fastening time
M16 (5/8")
M16 (5/8")
M14 (9/16")
M12 (1/2")
Seconds
2 3
M12 (1/2")
M12 (1/2")
M10 (3/8")
M8 (5/16")
Seconds
2 3
NOTE:
• When fastening screw M8 (5/16") or smaller,
carefully adjust pressure on the switch trigger so
that the screw is not damaged.
• Hold the tool pointed straight at the bolt or nut
without applying excessive pressure on the tool.
• If you fasten the bolt for a time longer than
shown in the figures, the bolt or the socket may
be overstressed, damaged, etc. Before starting
your job, always perform a test operation to
determine the proper fastening time for your
bolt. Especially for the bolt over than M8 (5/16"),
perform the above test operation to prevent the
trouble on socket or bolt, etc.
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. Voltage
Voltage drop will cause a reduction in the fasten-
ing torque.
2. Socket
• Failure to use the correct size socket will
cause a reduction in the fastening torque.
• A worn socket (wear on the hex end or
square end) 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 fasten-
ing torque will differ according to the diame-
ter 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 reduc-
tion in the fastening torque.
MAINTENANCE
CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspec-
tion or maintenance.
• Never use gasoline, benzine, thinner, alcohol
or the like. Discoloration, deformation or cracks
may result.
5 ENGLISH