Bedienungsanleitung Hitachi wh12dm2 (Seite 68 von 74) (Englisch, Dänisch, Schwedisch, Norwegisch, Finnisch)

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M14 × 50

0 123

kgf·cm N·m

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M12 × 45

0 123

kgf·cm N·m

Tightening torque

Tightening time: sec

(Steel plate thickness

t = 10 mm)

Tightening time: sec

(Steel plate thickness

t = 25 mm)

Tightening time: sec

(Steel plate thickness

t = 25 mm)

Fig. 23

Ordinary bolt

Hightension bolt

Ordinary bolt

Hightension bolt

6. Holding the tool

Hold the impact wrench firmly with both hands. In

this case hold the wrench in line with the bolt.

It is not necessary to push the wrench very hard.

Hold the wrench with a force just sufficient to

counteract the impact force.

7. Confirm the tightening torque

The following factors contribute to a reduction of the

tightening torque. So confirm the actual tightening

torque needed by screwing up some bolts before the

job with a hand torque wrench. Factors affecting the

tightening torque are as follows.

(1) Voltage

When the discharge margin is reached, voltage

decreases and tightening torque is lowered.

(2) Operating time

The tightening torque increases when the operating

time increases. But the tightening torque does not

increase above a certain value even if the tool is

driven for a long time. (See Fig. 23, 24, 25 and 26)

(3) Diameter of bolt

The tightening torque differs with the diameter of the

bolt as shown in Fig. 23, 24, 25 and 26. Generally a

larger diameter bolt requires larger tightening torque.

(4) Tightening conditions

The tightening torque differs according to the torque

ratio; class, and length of bolts even when bolts with

the same size threads are used. The tightening torque

also differs according to the condition of the surface

of workpiece through which the bolts are to be

tightened. When the bolt and nut turn together, torque

is greatly reduced.

1000

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400

200

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100

M10 × 30

kgf·cm N·m

Ordinary bolt

Hightension bolt

(5) Using optional parts (WR12DM2, WR9DM2)

The tightening torque is reduced a little when an

extension bar, universal joint or a long socket is

used.

(6) Clearance of the socket (WR12DM2, WR9DM2)

A worn or deformed hex. or a square-holed socket

will not give an adequate tightness to the fitting

between the nut or anvil, consequently resulting in

loss of tightening torque.

Using an improper socket which does not match to

the bolt will result in an insufficient tightening torque.

Matching socket and bolt sizes are shown in Table 1,

2, 3 and 4.

(7) Tightening torque varies, depending on the battery’s

charge level (WR12DM2, WR9DM2)

Fig. 28 and 29 shows an example of the relationship

between tightening torque and the number of

tightenings, for WR12DM2, WR9DM2. As shown,

tightening torque gradually weakens with the increase

in the number of tightenings. In particular, as the

torque decreases very close to the complete discharge

(“a” margin in graph), the unit’s impact weakens, the

number of time impacts declines and tightening

torque drops off abruptly. If this occurs, check torque

level, then recharge the battery if necessary.

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