Makita 6990D User Manual download pdf (Page 11)

OPERATION

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.

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 the tool is operated continuously until the battery

cartridge has discharged, allow the tool to rest for 15

minutes before proceeding with a fresh battery.

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 com-

pletely, 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.

M12

M10

(14)

(29)

(58)

(43)

1.0 2.0 3.0

Standard bolt

N.m

(ft.lbs)

M12(1/2”)

M10(3/8”)

M8(5/16”)

(S)

Fastening time

Fastening torque

Proper fastening torque

002840

1.0 2.0

3.0

(14)

(29)

(58)

(43)

N.m

(ft.lbs)

High tensile bolt

M10(3/8”)

M10

M8(5/16”)

(S)

Fastening time

Fastening torque

Proper fastening torque

002841

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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Makita 6990D User Manual Page 11

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