Maintenance; Tightening Torque - Panasonic EY7201 Bedienungsanleitung

IV.LAMP INDICATIONS
Red Flashing
Red Lit
Green Flashing quickly
Orange Lit
Orange Flashing
V.MAINTENANCE
Use only a dry, soft cloth for wiping the unit. Do not use a damp cloth, thinner, ben-
zine, or other volatile solvents for cleaning.
VI.TIGHTENING TORQUE
The power required for tightening a bolt will vary, according to bolt material and
size, as well as the material being bolted. Choose the length of tightening time
accordingly.
Reference values are provided below.
(They may vary according to tightening conditions.)
Factors Affecting Tightening Torque
The tightening torque is affected by a wide variety of factors including the follow-
ings. After tightening, always check the torque with a torque wrench.
1) Voltage
When the battery pack becomes nearly discharged, the voltage decreases and the
tightening torque drops.
Charger is plugged into the AC outlet.
Ready to charge.
Now charging
Charging is completed.
Battery pack is warm. Charging will begin
when temperature of battery pack drops.
Charging is not possible. Clogged with
dust or malfunction of the battery pack.
– 10 –
Bolt Tightening Conditions
M8.M10.M12 x 25mm Standard bolt
(Bolt size : Millimeters)
N ⋅ m
(k g f-cm)
117.6
(1200)
98.1
(1000)
78.5
M12
(800)
58.8
(600)
M10
39.2
(400)
19.6 M8
(200)
0.5 1 1.5 2 2.5 3
Tightening time (Sec.)
M8.M10.M12 x 25mm High tensile bolt
N ⋅ m
(k g f-cm)
117.6
(1200)
M12
98.1
(1000)
78.5
(800)
M10
58.8
(600)
39.2
(400)
M8
19.6
(200)
0.5 1 1.5 2 2.5 3
Tightening time (Sec.)
– 11 –
Washer
Bolt
Steel plate
thickness 10 mm (3/8")
Washer
Nut
Spring washer
Tightening conditions
* The following bolts are used.
Standard bolts: Strength type 6.8
High tesile type 12.9
Explanation of the strength type
6.8
Bolt yield point
(80% of tenslie strength)
48 kgf/mm 2 (68,000psi)
Bolt tensile strength 60 kgf/mm 2
(85,000psi)
2) Tightening time
L o n g e r t i g h t n i n g t i m e r e s u l t s i n
increased tightening torque. Excessive
tightening, however, adds no value and
reduces the life of the tool.
3) Different bolt diameters
The size of the bolt diameter affects
the tightening torque.
G e n e r a l l y , a s t h e b o l t d i a m e t e r
increases,tightening torque rises.
4) Tightening conditions
• Tightening torque will vary, even
with the same bolt, according to
grade, length, and torque coefficient
(the fixed coefficient indicated by the
manufacturer upon production).
• Tightening torque will vary, even
with the same bolting material (e.g.
steel), according to the surface fin-
ish.
• Torque is greatly reduced when the
bolt and nut start turning together.
5) Socket play
Torque is lowered as the six-sided
configuration of the socket of the
wrong size is used to tighten a bolt.
6) Switch (Variable speed control trigger)
Torque is lowered if the unit is used
with the switch not fully pulled out.
7) Effect of Connecting Adapter
The tightening torque will be lowered
through the use of a universal joint or
a connecting adaptor.