InFocus VR 9DM2 manual show examples of the relationship

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(5) Using optional parts (WR12DM2, WR9DM2)													(7) Tightening torque varies, depending on the battery’s
	The tightening torque is reduced a little when an													charge level. (WR12DM2, WR9DM2)
	extension bar, universal joint or a long socket is													Fig. 28 and 29 show examples of the relationship
	used.													between tightening torque and the number of
(6) Clearance of the socket (WR12DM2, WR9DM2)														tightenings, for WR12DM2 and WR9DM2. As shown,
	A worn or deformed hex. or a square-holed socket													tightening torque gradually weakens with the increase
	will not give an adequate tightness to the fitting													in the number of tightenings. In particular, as the
	between the nut or anvil, consequently resulting in													torque decreases very close to the complete discharge
	loss of tightening torque.													(“a” margin in graph), the unit’s impact weakens, the
	Using an improper socket which does not match to													number of time impacts declines and tightening
	the bolt will result in an insufficient tightening torque.													torque drops off abruptly. If this occurs, check torque
	Matching socket and bolt sizes are shown in Table 1,													level, then recharge the battery if necessary.
	2, 3 and 4.
For WH12DM2
										kgf·cm	N·m		M12 ⋅ 45					kgf·cm			N·m	M14 ⋅ 50
										1400	140							1400			140
	kgf·cm		N·m							1200	120							1200			120
		M10		⋅ 30					1000	100							1000		100		High tension b		olt
	1000						100											torqueTightening
torqueTightening											torqueTightening
	200	20		High tension b			olt		200	20							200		20
										800		High tension b			olt			800
	800		80								80									80
	600		60							600	60							600		60		Ordinary bolt
	400		40							400	40		Ordinary bolt					400		40
				Ordinary bol		t
	0		0							0	0							0		0
		0		1	2			3			0		1	2		3			0			1	2		3
		Tightening time: sec.									Tightening time: sec.										Tightening time: sec.
		(Steel plate thickness									(Steel plate thickness										(Steel plate thickness
		t = 10 mm)									t = 25 mm)										t = 25 mm)

For WH9DM2

	kgf·cm	N·m				M8 ⋅ 30
torque	1000		100
	800			80
								bolt
						High	tension
Tightening	600			60
	400			40
	200			20
	0			0
					1		2		3
		0

Tightening time: sec.

(Steel plate thickness t = 10 mm)

			Fig. 22
	kgf·cm	N·m		M10 ⋅ 30
	1000	100
torque		80		High tension bolt
	800
Tightening	600	60
	400	40		Ordinary bolt

20020

00

0 1 2 3

Tightening time: sec.

(Steel plate thickness t = 25 mm)

	kgf·cm	N·m			M12 ⋅ 45
	1200		120
	1000	100
				High		tension bolt
torque	800		80
	600		60
Tightening
			40
	400				Ordinary bolt
	200	20
	0		0

0 1 2 3 Tightening time: sec.

(Steel plate thickness t = 25 mm)

Fig. 23

15